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					              ELEMENTAL
             REQUIREMENTS




HSG 3657C

ISSUE DATE: 23/04/2004
            KITCHENS




HSG 3657C
ELEMENTAL REQUIREMENTS – KITCHENS

1.    Each kitchen will have been designed by the kitchen suppliers, within the specification,
      to suit individual family requirements regarding layout and choice.

2.    Fittings to comprise of base and wall units with 30 mm thick post-formed worktops.

3.    The number of base units (with drawline units as standard) and wall units to equal,
      where practicable:-

      2, 3 and 4 bed house/bungalow : 1 Nr. sink unit, 1 Nr. corner unit, 2 Nr. 600 mm base
      units, 1 Nr. double wall unit, 1 Nr. single wall unit and a minimum of 2m worktop

      1 bed house/bungalow and all flats, where practicable: 1 Nr. sink unit, 2 Nr. 600 mm
      base units and 2 Nr. 600 mm wall units and minimum of 1 m worktop (500 mm units
      may be used in Flats and 1 bed bungalows if required)

      Note: Wall unit to be minimum of 700 mm high.

      Note: Only allow 2 No. White goods i.e. fridge and washer, where there are further
      White goods this will reduce the number of units.

4.    All sinks to be inset stainless steel single bowl to BS 1244 and drainer complete with
      taps, wastes and fitting into worktops.

5.    A blank end panel is to be fitted at the end of a worktop where there is no base unit.

6.    Allowance to be made for providing a cooker space, under-counter washing machine
      space and space for fridge/freezer.

7.    Form hole for dryer vent including pipe liner and vent grille (where dryer is present).
      Make good structure and finishes disturbed.

8.    Ceramic tile splashback to all worktops, (including behind cooker space), 450 mm high
      and one tile below line of worktop behind cooker.

9.    Wall units to be fixed 450 mm above worktops.

10.   All cookers must have a minimum of 300 mm of worktop either side, where practicable.

11.   Stop tap to be relocated (where necessary) to location which is accessible.

12.   A gas and electric point must be provided to cooker space.

13.   Exposed electric meter within the kitchen is to be boxed in using softwood timber frame
      and plywood cover, with easy means of access.




HSG 3657C                                      -1-
14.   Where gas meters are currently installed under sink base units, replacement base units
      may be replaced over them. Where sink base units are being relocated, this should not
      be over an existing gas meter, where practicable. Where gas meters are found in
      difficult or awkward positions, provision must be made to ensure easy access to the
      meter and meter control handle. Gas meters are only to be relocated where absolutely
      necessary.

15.   All redundant appliances to be disconnected and removed to a designated recycling
      plant and/or licensed waste disposal site.

16.   A pantry/store cupboard will only be removed in order to meet Decent Homes space
      and layout considerations.

17.   Plastering to walls and ceilings will be in a sound condition, and fully bonded to
      background with no hollowing and free from significant cracking.
.
18.   All floors are to be even and free from major undulations.

19.   All new woodwork will match existing profiles and is to be primed, generally 19 mm
      thick softwood architrave and skirtings to be used, and receive gloss white finish

20.   Electrical work to a new kitchen will include:-

      (See Electrical Specification Requirements)

      A new consumer if required
      Earth bonding to I.E.E. 16th Edition Wiring Regulations and main Electrical Specification
      3 - Double 13 amp switched sockets above worktop height
      1- Double Socket at 450 mm
      1 - Cooker control switch with socket outlet mounted to the side of cooker space
      1 - Cooker cable outlet

      Where applicable single 13 amp socket for washer, dryer or fridge below worktop
      controlled by a double pole switched fused spur unit above worktop engraved to its use

      1 - New fluorescent light fitting (as specified in main specification).

      2 - Fit unswitched fused spur in kitchen, connected to local lighting circuit, without the
          use of junction boxes) for connection to extract fan that may be installed at a later
          date.

21.   If decoration is required then walls to be painted with Magnolia colour paint only, and
      ceilings with White emulsion only.




HSG 3657C                                       -2-
KITCHEN SPECIFICATION

KITCHEN UNITS:

Manufacturers and ranges to be confirmed.

SINK TOPS:

Manufacturers and ranges to be confirmed.

CERAMIC WALL TILES:

Manufacturers and ranges to be confirmed.




HSG 3657C                                   -3-
                 TENANTS CHOICE – KITCHEN OPTIONS – RIXONWAY

                   OPTION A                                      OPTION B

KITCHEN UNIT: LIGHT OAK                             KITCHEN UNIT: MAPLE

WORKTOP: TIFFANY BEIGE                              WORKTOP: BAHIA BLUE

VINYL FLOOR: JUPITER STU170                         VINYL FLOOR: VENUS STU 110 OR
                                                                 CONSTELLATION STU 190
WALL TILES: LIGHT AND DARK BEIGE
                                                    WALL TILES: LIGHT AND DARK BLUE




                   OPTION C                                      OPTION D

KITCHEN UNIT: INGLETON WHITE                        KITCHEN UNIT: GREEN ALDER

WORKTOP: DAKOTA                                     WORKTOP: MAPLE

VINYL FLOOR: JUPITER STU170                         VINYL FLOOR: NEPTUNE STU 130 OR
                                                                JUPITER STU 170
WALL TILES: WHITE
                                                    WALL TILES: LIGHT AND DARK GREEN




The above references are as follows:
Kitchen and worktop - RIXONWAY
Vinyl Flooring - Marley slip resistant safe tread
or equivalent approved
Wall tiles to be 150 x 150 mm




HSG 3657C                                     -4-
                 TENANTS CHOICE – KITCHEN OPTIONS – SYMPHONY

                   OPTION A                                      OPTION B

KITCHEN UNIT: AMBLESIDE LIGHT                       KITCHEN UNIT: CONWAY PEARWOOD
              OAK
                                                    WORKTOP: SAPPHIRE
WORKTOP: COSMIC BEIGE
                                                    VINYL FLOOR: VENUS STU 110 OR
VINYL FLOOR: JUPITER STU170                                      CONSTELLATION STU 190

WALL TILES: LIGHT AND DARK BEIGE                    WALL TILES: LIGHT AND DARK BLUE




                   OPTION C                                      OPTION D

KITCHEN UNIT: INGLETON WHITE                        KITCHEN UNIT: CONWAY GREEN ALDER

WORKTOP: DARK GRANITE                               WORKTOP: PEARWOOD

VINYL FLOOR: JUPITER STU170                         VINYL FLOOR: NEPTUNE STU 130 OR
                                                                 JUPITER STU 170
WALL TILES: WHITE
                                                    WALL TILES: LIGHT AND DARK GREEN




The above references are as follows:
Kitchen and worktop - SYMPHONY
Vinyl Flooring - Marley slip resistant safe tread
or equivalent approved
Wall tiles to be 150 x 150 mm




HSG 3657C                                     -5-
            BATHROOMS




HSG 3657C
ELEMENTAL REQUIREMENTS – BATHROOMS

1.    Baths - Porcelained press steel bath, minimum 2.3 mm thick, complete with twin grips
      with 2 tap holes and non-slip base. All fittings complete with traps, overflow and
      chrome plated waste and plug and chain.

2.    Wash hand basin complete with pedestal. All fittings complete with trap, overflow and
      chrome plated waste and plug and chain.

3.    Water efficient close-coupled W.C. suite to be fitted.

4.    Shower unit, if replacing existing, to discharge over bath, including shower rail and
      curtain. An electric shower will be fitted.

      The tenant will be given the choice if they require a shower in lieu of a bath.

5.    If shower fitted then to be a level access shower with half height cubicle and shower
      curtain and chrome finish rail over, with uPVC side panels to be fitted.

6.    Three rows of tiles around bath where no shower fitted. No motif tiles included.

7.    One row of tiles above wash hand basin. No motif tiles included.

8.    A choice of bath panels and W.C. seats are to be offered.

9.    All new woodwork is to match existing profiles and is to be primed.

10.   Plastering to walls and ceilings will be in a sound condition and fully bonded to
      background with no hollowing and free from significant cracking.

11.   Install a shower circuit in all refurbished bathrooms for connection to an electric shower
      that may be fitted in the future, the 10 mm twin and earth cable shall terminate into a
      30A joint box in the roof space with enough spare cable to reach a future electric
      shower, the cable is to have a traffolyte label tie wrapped to it saying „shower cable‟.
      The shower cable shall be terminated into a 40A MCB in the existing consumer unit (or
      new consumer unit if no spare ways), the MCB shall be left in the off position and a
      Traffolyte label fitted to consumer unit lid saying „Shower circuit terminated in loft‟.

      If an electric shower is being installed as part of the refurbishment then the circuit shall
      be installed as detailed in main performance specification.

12.   Earth bonding to IEE 16th Edition Wiring Regulations including Amendment 3,
      Section 601 and Main Electrical Specification.

13.   Installation of new energy efficient light fitting (as detailed in Main Specification).




HSG 3657C                                       -6-
14.   Supply and install unswitched fused spur connected to lighting circuit for connection
      to an extract fan which may be installed on a future date. The spur is to be located on
      the landing adjacent the bathroom door at high level. The use of junction boxes will
      not be allowed.

15.   If decoration is required then walls to be painted with Magnolia colour paint only, and
      ceilings with White emulsion.

16.   All new woodwork to be primed and receive gloss finish, colour White.




HSG 3657C                                    -7-
BATHROOM SPECIFICATION

BATHROOM SUITE:

Manufacturers and ranges to be confirmed.

BATH PANEL:

Manufacturers and ranges to be confirmed.

SHOWER:

Manufacturer: Mira Advance or Triton Millenium Care Thermostatic.

SHOWER TRAY:

Manufacturer:

TAPS:

Manufacturers and ranges to be confirmed.

SHOWER CURTAIN AND RAIL:

Manufacturer:

Chrome shower rail which is to extend for the full length of the bath, or the perimeter of
cubicle with White nylon shower curtain. The curtain must be mould resistant and be
sufficient to extend 200 mm below the rim of the bath/shower cubicle and long enough to
completely enclose the room side of the bath.




HSG 3657C                                     -8-
       CENTRAL HEATING




HSG 3657C
ELEMENTAL REQUIREMENTS - CENTRAL HEATING

All systems are to comply with the Energy Efficiency CHeSS (2002) specifications, Good
Practice Guide 302, The Building Regulations 2005 and Gas Safety (Installation and Use)
Regulations 1998.

A full central heating system is to be installed to BMBC/Berneslai Homes Specification:-

- with the exception of 1 bedroom bungalows and all flats where a combination boiler is
  preferred.

Boiler to be adequately sized following design and specified from agreed list of boiler
manufacturers - see attached.

Radiators to be fitted in every habitable room and to be sized to achieve minimum comfort
conditions of:-

Living Room      -   23°C
Bathroom         -   23°C
Bedroom          -   23°C
Hallway          -   18°C
Kitchen          -   20°C

assuming outside to be minus -3°C

Radiators to be positioned in such a way as to minimise the amount of pipework required.
Radiators to be fitted under windows where possible. Excessive pipe runs and automatic
positioning of radiators to be in agreement by tenant. (Assuming radiators not located below
windows).

T.B.O.E. connections to be fitted where elderly tenants occupy the property.

All radiators must have TRV fitted except in rooms with a thermostat.

Bathrooms left with no TRV 7 - Consideration must be given so as not to restrict wheelchair
access or door openings etc.

Pipework to go under floorboards, wherever possible.

All pipework to loft and floor void and exposed in cylinder cupboard to be lagged, to meet
Part L of Building Regulations.

Controls to be easily accessible for tenants use and to be of a type to satisfy CHeSS
standards.




HSG 3657C                                     -9-
All redundant appliances to be disconnected and removed. All disturbed surfaces to be made
good.

Where stored water is installed an electric immersion heater is to be provided (as back up)
where a power source is available in cylinder cupboard.

Preferred location of room thermostat - Hallway. Not affected by radiator.

All systems must be commissioned in line with manufacturer‟s instructions and to benchmark
standards. This includes written and verbal advice to tenant on how to use the new system by
the installation engineer or a representative of the installation company at the time of
installation.

One week after commissioning, Tenant Liaison Officer to visit properties where new central
heating system installed to confirm if tenant is able to use/operate system satisfactorily.
All systems to be flushed to boiler manufacturer‟s specification and Scalemaster inhibitor
appropriate to the boiler.

When installing new heating system all old galvanised tanks/cisterns to be replaced with new
plastic ones to bye-law 30.

For electrical wiring of central heating systems see main Electrical Specification.

Condensing Boilers

We believe that condensing technology is now as reliable as non-condensing, although we
still have an issue with “complex” combination boilers.

Although they may not be in condensing mode some, or most, of the time they will still
be more efficient than non-condensing models. Under the decent standard they are the
boilers recommended.

Siting in an Acceptable Position

The provision of a condensate drain is the only difference compared to non-condensing
models. However, this may restrict the possible sites a boiler can be fitted, although
running the condensate to an internal waste (i.e. sink waste), is acceptable to most
manufacturers and can overcome the problem.

If the only place to site a condensing boiler would be detrimental to the achievement of
the decent home standard then non-condensing models should be selected. An example
could be where the only option available to site a condensing boiler is in a small kitchen,
resulting in the loss of “valuable” cupboard space. A non-condensing model sited elsewhere
would then be acceptable, i.e. in the centre of the building with a vertical flue.




HSG 3657C                                     - 10 -
Plumbing and Nuisance

Even though the flue products are no more detrimental to health than those from non-
condensing boilers there is a concern and complaints, with the visual impact of plumbing.

Therefore, consideration should be given when siting or deciding upon a condensing boiler.
The nuisance created is largely subjective. However, the following should be considered
when siting:-

-   Closeness to windows and doors of both the tenants and neighbours.

-   Discharging over a regularly used communal walkway, especially at low level.

-   The impact where a number are fitted close together, will it look like a “Lowry
    landscape”?

-   The tenant‟s views if, when considering the above, the plumbing could be regarded as a
    nuisance then a non-condensing option should be sought.

System Controls

We are finding the complexity of controls is a growing problem for our tenants. Therefore, a
timeswitch can be used in HC4, a full programmer in HR4.




HSG 3657C                                    - 11 -
CENTRAL HEATING SPECIFICATION

RADIATORS: TO BS3528

Manufacturer:

Caradon Stelrad Ltd.
Potterton Myson Ltd.
Thorn EMI Heating Ltd,
Barlo Compact
Equal or approved

PUMP:

Manufacturer:

Grundfos Ltd.
Myson Heating
Equal or approved

CYLINDER AND DOMESTIC HOT WATER CISTERN:

Manufacturer:

IMI Range Ltd.
Gledhill Water Storage
Albion Superduty

PIPE BOXING:

Manufacturer:

Thorsman &. Co., (UK) Vertical
Pendock Profile (TK Range)
Horizontal
Planadapt Perimeter
Systems Ltd.
Horizontal
Where fitted not to be used as standard

BOILER:

Manufacturer:

Baxi
Glow-worm
Worcester
High Efficiency Boilers Only




HSG 3657C                                 - 12 -
GAS FIRES:

Baxi „Brava‟
Valor „Black Beauty Slimline‟

ELECTRIC FIRES:

Suncrest: „Oakwell‟ Electric Suite
Complete With Surround, Back Panel and Hearth

Robinson Willey: „Pimlico‟ Electric Suite
Complete With Surround, Back Panel and Hearth

Katell: „The Newstead Oak‟ Electric Suite
Complete With Surround, Back Panel and Hearth

Katell: „The Kielder Oak‟ Electric Suite
Complete With Surround, Back Panel and Hearth

IMMERSION HEATER:

Manufacturer:

Santon
Creda

WATER TREATMENT:

Manufacturer:

Scalemaster

THERMOSTATIC RADIATOR VALVES: Note 2 way only

Manufacturer:

Pegler Ltd.
Honeywell Controls Ltd.
Danfoss Randall Ltd.




HSG 3657C                                - 13 -
HEATING CONTROLS:

Manufacturer:

Danfoss Randall Ltd.
Honeywell Controls Ltd.
Siemens Building
Technologies Ltd.

TIME CONTROL AND ROOM THERMOSTAT:

Manufacturer:

Design suitable for the property and occupants
Note: Randall Set 3E suitable

INSULATION:

Manufacturer:

Armaflex Armstrong

All materials specified or similar approved.




HSG 3657C                                      - 14 -
            ELECTRICAL




HSG 3657C
ELEMENTAL REQUIREMENT – ELECTRICS

Quality Control

The installation shall comply with all the relevant statutory instruments and current
regulations and materials used in accordance with the latest British Standards and code of
practice.

The Employer of the Electrician should be a member of NICEIC, or ECA and must employ
checkable quality control methods.

Qualifications for Installers

Persons employed in the installation of electrical systems should be competent, the term
competent is deemed satisfied by completion of a recognised trade qualification such as City
and Guilds 236 Parts 1 and 2.

Trainees should be actively working towards the qualifications.

Qualifications for Electrical Testing Engineers

Persons carrying out the certification of electrical installations should have been trained to do
so, suitable qualification being City and Guilds 2391. Where the installer does not possess
the City and Guilds 2391 qualification they can employ someone who has the qualification to
complete and sign the certificate, but should use the 3 signature version of the installation
certificate.

Specific Area/Item Requirements

Bathroom

Where required by the specification an electric shower is to be installed, where a shower is
installed under this contract the Contractor shall check that equipotential bonding is installed
to BS 7671: 2001 including Amendment Nr. 1 2002.

The bonding within the bathroom should not be connected to any earth outside the bathroom.

CAUTION: Where only bathroom works are required to a dwelling the Electrical Contractor
should still check that any existing equipotential bonding disturbed by the works have not
adversely affected the integrity of the bonding.

Fused Spur for later provision of a fan to Bathroom

The provision of a fused spur must be included for the later provision of an electric fan. The
position is to be on the landing adjacent bathroom door.




HSG 3657C                                      - 15 -
Replacement of Consumer Unit

Where required by other works, i.e. installation of shower circuit, etc., the consumer unit is to
be replaced as detailed in the full rewire specification, all spare ways must be fitted with
spare circuit breakers not blanking plates. Meter tails are to be checked for compliance with
the full rewire specification and if smaller CSA they should be upgraded as part of the
replacement the consumer unit. Meter tails should not be connected directly into the
metering equipment as this could be seen as tampering with the meter. A double pole
connector block should be installed with the new and old tails installed and arrangement
should be made for the energy supplier to make a permanent connection to the meter.
Similarly, the main equipotential bonding should be checked for compliance and upgraded to
current standards. Where the consumer unit is changed the entire installation should be tested
and all defects recorded, these defects should include provision/height of socket outlets etc.

Rewire Standards

Kitchen

3 - Double 13 amp switched sockets above worktop height
1- Double socket at 450 mm
1 - Cooker control switch with socket outlet to side of cooker space
1 - Cooker cable outlet
Immersion heater switch where applicable

Lounge

4 - Double 13 amp switched sockets (2 to be adjacent to TV area)

Hall/Landing

1 - 13 amp single switched socket

Bedrooms

2 - Double 13 amp switched sockets to all bedrooms




HSG 3657C                                     - 16 -
Smoke Detectors

Supply and install optical smoke detector in hallway and ionisation smoke detector on
landing, as detailed in main specification.

Where the property is being rewired install smoke detectors as described in Main Technical
Specification.

In all elderly persons dwellings being rewired the 240V smoke detectors are to be linked to
the existing warden call systems if possible, the Contractor shall engage the services of a
Specialist Contractor to see if the existing warden call systems are able to accept new
connections. Central call are to be notified of all successful interconnections.

In all dwellings where 1 Nr. existing 240V smoke detector exists, then a new 240V detector
shall be installed as part of Decent Homes and linked to the existing detector.

In all dwellings that are NOT being rewired and have no smoke detectors fitted, then battery
smoke alarms are to be installed under local Decent Homes standards if authorised.

Supply and install shower circuit only, as described in elemental requirements for bathroom
refurbishments, in all full rewires.

Rewire immersion heater (where applicable) or provide one where water storage is fitted or to
be fitted.

Rewire lighting as existing but including energy efficient lighting as described in main
technical specification, including external lights to rear doors in houses, all bungalows to
have external lights to front and back doors.

If existing central heating circuit is not a radial circuit then a new radial circuit shall be
installed.

Please Note:

All sockets excluding kitchen area to be installed at the following height 450 mm to centre of
socket in houses and flats above ground floor level (or as agreed by tenant and Supervising
Officer).

600 mm to centre of socket in bungalows and flats at ground floor level (or as agreed by
tenant and Supervising Officer).

A minimum height of 300 mm must be maintained if alterations to the above is agreed.

Lighting switches to be installed at 1350 mm to centre of switch, (or as agreed by tenant and
Supervising Officer) existing decorations may be taken into consideration, but only if no
disturbance would take place if sited to original height.

The use of cavity walls for installing cables is strictly forbidden.




HSG 3657C                                        - 17 -
Ground and First Floor Flats

When rewiring ground floor flats, cables are to be concealed in Gyproc plaster coving in
bedrooms, hall, lounge and kitchen. The Electrical Contractor shall employ a Specialist
Contractor to fit the coving. When rewiring first floor flats if the existing consumer unit is
located at the bottom of the stairs leading to the flat, then the new consumer unit shall be
fitted in a suitable location in the flat itself.

A new switch fuse shall be fitted in cupboard at bottom of stairs and a suitable sub-main
installed enclosed in PVC trunking up to new consumer unit.

The existing consumer unit shall be replaced as part of a full rewire as detailed in Main
Specification.

The split type consumer unit is a combined unit that will enable some circuits e.g. sockets,
showers, external supplies to sheds etc., to be protected by an RCD/MCB's.

Please Note: Authorisation may be required from the Supply Authority to
disconnect/reconnect to the mains supply especially in cases where seals have to be
removed/replaced.

Properties with Mains Powered Stairlifts

The supply for mains powered stairlifts to be from a dedicated circuit connected either to the
existing consumer unit or from a separate consumer units, protected by a 16 amp MCB but
NOT through a RCD. The RCD location is on the landing adjacent to a double pole switch
with neon indicator.




HSG 3657C                                     - 18 -
ELECTRICAL SPECIFICATION

1. This specification covers the design, supply, assembly, installation, connecting up, testing
   and setting to work of new, modified or additional electrical installations within Council
   dwellings.

2. Works may include the provision in full or in part of the following services:

   (a)   Main switchgear/consumer unit and associated connections into Y.E. metering
         equipment.

   (b)   Earthing and bonding the installation, in accordance with the I.E.E. Regulations.

   (c)   Switch socket outlet installation within the dwelling, including all associated items
         such as accessories, plug tops and fuses.

   (d)   General lighting installation within the dwellings, including all associated items
         such as switches, lampholders and ceiling roses.

   (e)   External lighting.

   (f)   Cooker circuit and accessories.

   (g)   Immersion heater circuit and accessories.

   (h)   Central heating boiler/water heater and controls.

   (i)   Testing and reconnection of tenants own equipment.

   (j)   Builder‟s work including making good to damaged plaster, removal of rubbish,
         redundant material and cleaning.

   (k)   Inspection and testing the installation.

   (l)   Labelling of installation.




HSG 3657C                                     - 19 -
Contractors Obligations

The Contractor shall be responsible for:-

1.    Carrying out all necessary site investigations and surveys of the site to facilitate the
      design and installation of services.

2.    The production of accurate plan layouts or schedule on which to base the design and
      installation of services.

3.    The detail design, supply, installation, inspection, testing, commissioning and
      certification of all works detailed in the „Scope of Works‟ and this specification.

4.    Undertaking all design calculations required to meet the specification and submission of
      the same for perusal by the Employer.

5.    Providing record drawings, operating instructions, manuals, comprehensive test results
      and reports covering all works.

6.    Instructing the employer‟s staff and Council tenants in the use, operation and
      maintenance of the works.

7.    Demonstrating that all plant and equipment operates correctly, individually and
      collectively to meet the specification requirements.

8.    Liaison with Council tenants, Council Committees and Liaison Officers.

9.    Liaison with electricity supply companies in regard to access and connection of
      electricity supplies, amendment to tariffs, condition and suitability of electrical supplies.

10.   Compliance with the Authority‟s Access and Equality Standards.




HSG 3657C                                      - 20 -
Regulations and Standards

General

The works shall be designed, installed, tested and commissioned in accordance with the
following regulations, Codes of Practice and Guidance Documents:-

Statutory Regulations

-   The Health and Safety at Work Act 1974
-   The Electricity at Work Regulations 1989
-   The Construction and Design Management Regulations 1994
-   The Electricity Supply Regulations 1990
-   Management of Health & Safety at Work Regulations 1992
-   Manual Handling (Operations Regulations) 1992
-   Provision and Use of Work Equipment Regulations 1992
-   Personal Protective Equipment at Work Regulations 1992
-   Control of Substances Hazardous to Health Regulations 1988
-   Construction (General Provisions) Regulations 1961
-   Construction (Working Places) Regulations 1966
-   The Building Regulations (Current Issue), including Approved Document M

Codes of Practice

BS 7671 : 2001 Requirements for Electrical Installations

Guidance Documents

-   The On Site Guide to BS 7671 as published by the I.E.E.
-   Guidance Notes 1 - 7 on BS 7671 as published by the I.E.E.
-   CIBSE Code For Interior Lighting - LGI:1994
-   CIBSE Code For Lighting in Communal Residential Buildings LG9: 1997

Minimum Design Parameters

General

The following details are the minimum Employer‟s requirements in respect of design of
lighting and electrical services. Where reference is made to regulation numbers, these are
taken from BS 7671: 2001 - Requirements for Electrical Installations (16th Edition I.E.E.
Wiring Regulations) incorporating up to and including Amendment Nr. 2 1997.




HSG 3657C                                    - 21 -
   DOORS AND WINDOWS




HSG 3657C
ELEMENTAL REQUIREMENTS - EXTERNAL DOORS AND WINDOWS

L12- PLASTIC WINDOWS/ROOFLIGHTS/SCREENS/LOUVRES;
L22 PLASTIC DOORS/SHUTTERS/HATCHES

     To be read with Preliminaries/General Conditions.

     TRADE/COMPANY NAMES:

     Veka Plc.
     Farrington Road,
     Rossendale Road Industrial Estate,
     Burnley,
     Lancs. BB11 5DA
     Telephone: 01282/716611

     Mila Hardware & Machinery (UK) Ltd.
     1 Brunel Close,
     Drayton Fields Industrial Estate,
     Daventry,
     Northants. NN11 5RB
     Telephone: 01327/872511

     SFS Stadler Ltd.
     153 Kirkstall Road,
     Leeds. LS4 2AT
     Telephone: 0113/2430541

     Wagner (GB) Ltd.
     V.B.H. House,
     Bailey Drive,
     Gillingham Business Park,
     Gillingham,
     Kent. ME8 0WG
     Telephone: 01634/263263

     Solaglass Ltd.
     Customer Service Centre,
     Binley Two,
     Progress Way,
     Binley,
     Coventry. CV3 2ND
     Telephone: 024 76398237
     Fax:        024 76398237

     Fibreglass Systems UK Ltd.
     Unit 6L,
     Redbrook Business Park,
     Wilthorpe Road,
     Barnsley. S75 1JN



HSG 3657C                                 - 22 -
         Plastic Windows/Rooflights/Screens/Louvres;                                     L12-L22
         Plastic Doors/Shutters/Hatches (Cont‟d)

         TRADE/COMPANY NAMES: (Cont‟d)

         Duco Ventilation                  Ultimate Airflow Systems Ltd.
                                           Heath End Trading Estate,
                                           Heath End Road,
                                           Nuneaton. CV10 7HN
                                           Telephone: 024 76371710
                                           Fax:       024 76372128

         VISTA PANELS:-

         PRELIMINARY INFORMATION/REQUIREMENTS

105      PVCu WINDOWS/DOOR SETS:
         Shall be obtained from Veka Plc. or other approved manufacturer and shall be
         manufactured to conform to the Specification set out below.
         Refer to „Preliminaries/General Conditions Clause(s) A31/200-202‟ regarding
         Equivalent Products/‟equal and approved‟, and the procedure to be adopted regarding
         the „Tender Offer‟ (Clause A31/202), i.e. „the tender offer and in the priced
         documentation submitted therewith must be based upon quotations obtained for the
         named product and not for an „equivalent product‟.

106     DEPARTURE FROM SSM7 METHOD OF MEASUREMENT:
      - Safety glass incorporated into the window double glazed units and incorporated into
        the door sets/door sidelights/screens has not been separately identified. Safety glass is
        to be incorporated into the components as recommended by the window manufacturer
        in accordance with Clause L12-22/335.

110      EVIDENCE OF PERFORMANCE:
         Provide independently certified evidence that all specified variants of components
         comply with specified performance requirements.

121      SITE DIMENSIONS:
         Must be taken and recorded on schedules before starting to make PVCu
         windows/door sets.




HSG 3657C                                      - 23 -
        Plastic Windows/Rooflights/Screens/Louvres;                                    L12-L22
        Plastic Doors/Shutters/Hatches (Cont‟d)

122     MEASUREMENTS:
      - The measurement of all window and door opening sizes shall be taken at intervals
        across the structural opening to ascertain the narrowest point. The Contractor shall
        make all due allowances in this measurement for approved manufacturing to
        tolerances and recommended expansion gaps. The Contractor shall check all
        openings for squareness and if necessary notify the CA of any significant
        discrepancies.
      - Bay windows shall be carefully measured and all angles properly transferred to a
        template.
      - The measurements of all doors and frames sizes shall also take into account any
        difference between floor level and existing threshold level and the new aluminium
        thresholds shall be set to minimise these differences, with a PVCu sub-threshold as
        required to achieve this.

141     CONTROL
      - After finalisation of all details, prepare a set of working drawings showing
        constructional details for the CA‟s approval before proceeding with manufacture.

142     CONTROL SAMPLES:
      - After finalisation of all details, prepare one of each of the following as part of the
        quantity required for the project and obtain approval of appearance before proceeding
        with manufacture of the remaining quantity.
      - Purpose made plastics PVCu window, Spec. L12-22/330, 1040 x 1260, ground floor,
        side hung opening light - 1, fixed lights - 1; trickle ventilator.
      - Purpose made plastics PVCu door set, Spec. L12-22/332, 860 x 2040 Cruciform
        pattern.

        COMPONENTS

330     PVCu WINDOWS AND BS 7950 ENHANCED SECURITY (WHERE REQUIRED -
        GROUND FLOOR REAR AND SIDE OR ALL GROUND FLOOR):
      - To comply with BS 7412:1991 and BS 7413:1991 specification for White PVCu
        extruded hollow profiles with heat welded corner joints for plastic windows: Material
        Type „A‟ and the Specification for high impact modified PVCu extruded hollow
        profile section fabricated windows published jointly by the British Plastics Federation
        and the Glass and Glazing Federation.
      - Manufacturer and Reference: Veka Plc. (or other equal and approved) shall comply
        with BS 5750 Parts 1 and 2.
      - Each window shall be permanently marked within the section (not visible when
        opening lights are closed) with the name or trademark of the system‟s manufacturer
        and carry a 10 year written guarantee.




HSG 3657C                                     - 24 -
        Plastic Windows/Rooflights/Screens/Louvres;                                    L12-L22
        Plastic Doors/Shutters/Hatches (Cont‟d)

330     PVCu WINDOWS (Cont‟d)
      - Drawing Nr.
      - Weathertightness:
        To BS 5368 Parts 1, 2 and 3 and BS 6375:1989.
        Design Wind Pressure: 1600 Pa.
        Air permeability test pressure class: 600 Pa.
        Watertightness and pressure class: 300 Pa.
        Wind resistance test pressure class: 2400 Pa.
      - Operation and Strength Characteristics:
        To BS 6375:Part 2.
        All sections shall be extruded from high impact modified PVCu (Veka Plc. Matrix 58
        profile). The sections are to be multi-chambered with a minimum of 3 chambers front
        to back, the centre chamber being for reinforcement. The minimum outer wall
        thickness shall be 3 mm. The profile depth shall be a minimum of 58 mm and the
        profile width is to be sufficient to give adequate clearances from plaster finishes or
        timber linings. Frames when fabricated shall be internally self draining.
        The outlets shall be through the underside of the bottom frame which shall be an
        “extended” sill section (not flush) and not through applied plastic cowls. The internal
        drainage shall be isolated from chambers containing reinforcement.
        Mitred joints in the frames where „knife jointed‟ shall not be more than 2 mm wide.
        Where „grooved‟ joints are used, the width must not exceed 4 mm.
      - Extended sills shall have a minimum overhang of 35 mm and a maximum of 50 mm.
      - The jamb sections shall be of adequate width in the case of plastered or timber lined
        reveals to allow opening lights to operate without fouling the sashes.
      - Where make up trims are required they shall be cover beads or architraves of PVCu
        applied internally. External trims may be permitted by prior approval of the CA, as
        required by the system or to facilitate fixings.
      - Galvanised steel reinforcement shall be fixed as required to meet performance levels
        of the windows and to the system manufacturer‟s recommendations. Reinforcing
        shall be secured with suitable non-rusting screws at 400 mm centres and should be
        taken to within 5 mm of welded junctions. All galvanised steel reinforcing profiles
        shall comply with BS 2989:1982 Grade G 275N and be approved by the extrusion
        manufacturer.
      - Glazing: As Clause L12-22/335 internally beaded.
      - Ironmongery: As Clause L12-22/345.
      - Gaskets: As Clause L12-22/340.
      - Accessories: All windows are to be fitted with self adhesive hooks to allow tenants to
        fit net curtains.
        Finished windows (when glazed) must meet the requirements of Document L1 of the
        Building Regulations 1st April, 2002




HSG 3657C                                     - 25 -
         Plastic Windows/Rooflights/Screens/Louvres;                                    L12-L22
         Plastic Doors/Shutters/Hatches (Cont‟d)

332     PVCu DOOR SETS/ENTRANCE SCREENS:
      - Drawing Reference(s):
      - To the specification for plastic door assemblies made from PVCu extruded hollow
        profiles published jointly by the British Plastics Federations and the Glass and
        Glazing Federation.
        Performance Category A:
      - Manufacturer and Reference: Purpose made, built up units; components from
        specified manufacturers or other equal and approved.
        Front Door:
        Choice of three front door panels (currently Vista Panels)
        Door Frame/Screens/Sash: Veka Plc. 80 mm outer frame generally, 110 mm door
        sash; screen members Veka Plc. sections reinforced.
        Moulded and glazed infill panel incorporating 2 Nr. upper double glazed units; lower
        moulded detail; standard letterbox aperture.
        Rear Doors:
      - Cruciform Pattern Door Sets/Screens:
        Door Frame/Screens/Sash: Veka Plc. 80 mm outer frame generally, 110 mm door
        sash; screen members Veka Plc. sections reinforced.
        Cruciform Infill Panel: Veka Plc. Cruciform rails (vertical and middle rails). Two
        upper panels, double glazed units; lower infill units, by UDTA Panels.
      - Screen Infill Panels: Double glazed side/fanlights; GRP infill units by Fibreglass
        Systems UK Ltd.
      - Glazing Details: As Clause L12-22/335, internally beaded.
      - Ironmongery: As Clause L12-22/345.
      - Gaskets: As Clause L12-22/340.
      - Accessories: All windows are to be fitted with hook-ended self adhesive hooks to
        allow tenants to fit net curtains. All Wetherby front doors to be fitted with Black door
        numerals.
        Allow for all door check frame extension infill pieces, trims, beads, cover beads,
        thresholds, etc.
        Finished doors (when glazed) must meet the requirement of Document L1 of the
        Building Regulations 1st April, 2002. This would apply when the glazed area
        exceeds 50% of the total door area




HSG 3657C                                      - 26 -
         Plastic Windows/Rooflights/Screens/Louvres;                                      L12-L22
         Plastic Doors/Shutters/Hatches (Cont‟d)

335     GLAZING DETAILS:
        24 mm overall thickness
        6.4 mm clear laminated outer leaf - 14 mm cavity
        4 mm toughened inner leaf (inner leaf could be clear or Cotswold as required)
        Argon gas filled sealed units may also be required depending upon the cavity size and
        manufacturer of the Low-E sealed units. Low-E units to produce a value of less than
        1.7 w/m² °C.
      - The whole of the glass is to be manufactured to the best quality of its respective kind
        and shall be pitched clear of all specks, bubbles, smoke waves and other defects and
        shall comply generally with BS 952:Part 1:1978. The pattern of obscure glass shall
        be „Cotswold‟. All glass shall have clean cut edges.
      - Double glazed units shall be standard hermetically sealed double glazed flush edge
        units in accordance with BS 5713:1979, comprising:-
        Generally: 4 mm inner pane, 16 mm cavity and 4 mm outer pane, 24 mm overall
        thickness.
        Doors; Door Screens: 6.4 mm clear laminated safety glass inner pane, 14 mm cavity
        and 4 mm Cotswold patterned toughened glass outer pane.
        Fixed in accordance with BS 6263:1982 and must carry the manufacturer‟s 10 year
        written guarantee. The system‟s manufacturer must confirm in writing that nothing in
        this specification invalidates the guarantee. If units are not stamped, then the
        system‟s manufacturer shall provide evidence that they are manufactured in
        accordance with BS EN 1279.
      - All glazing shall be secured with splayed glazing beads fitted internally, 24 mm
        overall sealed unit thickness.
        All double glazed units shall comply with Document L1 of the Building Regulations
        1st April, 2002

340     GASKETS:
      - Manufacturer and Reference: Veka Plc. (or other equal and approved) Q-Lon
        generally; glazing beads including co-extruded gasket. Weldable gasket systems
        would be acceptable, providing that they achieve the specified weather tightness,
        comply with BS 7412/7950 and are capable of being removed and changed if worn or
        damaged.
      - Weatherseals shall consist of a double sealing system.
      - Seals shall be a continuous length, all joints must be at the top of the opening,
        centrally located and glued together. The glue must be approved by the PVCu
        extrusion manufacturer. Weather seals shall be capable of removal without disturbing
        the glazing system or removal of the frames or sash. Where possible glazing units
        shall be pre-glazed off site. Where off site glazing is not possible, site glazing will be
        permitted subject to approval.




HSG 3657C                                       - 27 -
        Plastic Windows/Rooflights/Screens/Louvres;                                    L12-L22
        Plastic Doors/Shutters/Hatches (Cont‟d)

345     IRONMONGERY:
      - Manufacturer and Reference: Components from specified manufacturers (or other
        equal and approved).
      - Ironmongery shall, wherever possible, be fixed to reinforced sections. Care must be
        taken to ensure that the cut ends of reinforcement are treated to avoid atmospheric
        corrosion, unless reinforcement is contained within a sealed chamber.
      - Top hung; side hung casements; suitable for Veka Plc. Matrix 58 Profile:
        Hinges:                   Mila Hardware & Machinery (UK) Ltd., FS 100 top hung
                                  friction hinge; SH 101 side hung friction hinge
                                  (Cotswold/Securistyle or similar)
        Lock/Handle -             Mila Hardware & Machinery (UK) Ltd., 22 mm backset
        First & Second Floors: Mushroom Espagnolette Gear (Rod 345 m) with Trickle Vent
                                  facility and strikers to suit; Securistyle Virage push button to
                                  openings, locking White espagnolette handle with 25 mm
                                  spindles
        Escape Provision -        Alternative Hinges fitted to all First Floor Window Casements:
        First & Second Floors: Mila Hardware & Machinery (UK) Ltd., Egress 13 mm friction
                                  hinge
        Security Provision -      Alternative Lock/Handles fitted to all Ground Floor Elevations:
        Ground Floor:             Wagner (GB) Ltd. Maco MK2 none croppable shoot bolt
                                  system, with trickle vent facility, incorporating mushroom cams
                                  and strikers to suit, must be able to meet BS 7950 security
                                  standard; Securistyle Virage, push button, key locking White
                                  espagnolette handle with 25 mm spindles.
        Night Vent:               Duco 15,000 Over Glass Vent
      - Entrance Doors:           Controllable end caps standard, fixed end caps and permanent
                                  ventilation version for rooms containing gas or solid fuel
                                  heating appliances
        Hinges:                   SFS Sadler Ltd. 1½ pair White door hinges.
        Lock/Handles:             Mila Hardware & Machinery (UK) Ltd., KFV 4500 lock -
                                  2 hooks, plus centre latch and deadbolt, 35 mm backset
                                  (Veka Plc. configuration to suit DC product codes, i.e. DC 230,
                                  DC 231, DC 232, DC 233, DC 238, DC 240, DC 250); strikers;
                                  Profile Cylinder 40/40 5 pin white; door handles to suit above
                                  (security anti drill cylinder not required).
        Accessories:              Standard White letter plate to front doors; chrome finish safety
                                  chain to all doors.
      - All accessories must be fixed through the PVCu sections into the galvanised steel
        reinforcement.
        All ferrous screws, nuts, bolts or other fastenings shall be of austentic steel complying
        with BS 970:Part 1 or BS 1449:Part 2 or BS 3111:Part 2 or for fixings A2 or A4
        complying with BS 6105. Coatings shall be either sheradized according to BS 4921
        dichromatic zinc plated or bright zinc plated as recommended for the use in the
        fabrication of PVCu windows




HSG 3657C                                     - 28 -
      Plastic Windows/Rooflights/Screens/Louvres;                                     L12-L22
      Plastic Doors/Shutters/Hatches (Cont‟d)

      INSTALLATION

710   PROTECTION OF COMPONENTS:
      Do not deliver to site components which cannot be put immediately into suitable
      clean, dry, floored and covered storage. Stack near vertical on level bearers,
      separated with spacers to prevent damage by and to projecting ironmongery, beads,
      etc.

752   FIXING OF PVCu WINDOWS:
      The windows are to be fixed with Cadmium plated Nr. F10 S120 Fischer bolts 5 mm
      diameter, 120 mm long, or equal and approved fixing, screwed into surrounding
      brickwork or concrete through heads, sills and jambs with a minimum of two fixings
      per side at centres not exceeding 450 mm. The Fischer or other bolt head shall be
      capped off with a White PVCu screw cap. Fixed lights to be capped prior to glazing.
      Substantial stainless steel fixing brackets screwed to the frame may be used at fixing
      light positions. Prior approval of the CA must be obtained to this method of fixing.
      Head and sill fixings may be omitted if the window is less than 600 mm wide. The
      method of fixing is to be in accordance with the Code of Practice for the Survey and
      Installation of White High Impact Modified PVCu Windows (COP2), produced by
      British Plastics Federation and the Glass and Glazing Federation and other British
      Standards and Trade Standards indicated below where relevant. All windows are to
      be fitted with self adhesive hooks to allow tenants to fit net curtain. Frame fixings
      should coincide with the locating points of the locking systems with suitable packing
      installed between the frame and the fabric of the building. The frame shall be packed
      at fixing points with the correct size of packing shim prior to fully tightening the
      fixtures. There should be no distortion of the frame due to tightening of the fixtures,
      thus allowing thermal movement to occur without overstressing the welded joints or
      distorting the opening by bowing of the frame. Frame packing shims shall be dense
      plastic and purpose designed, they shall not be glazing wedges or cut timber. The
      glazing unit or other infilling should be packed adjacent to all locking and hinge
      points in addition to any conventional location. Expanding foam is not to be used as a
      primary form of fixings. Its use is only to fill voids or holes and act as a backing for
      sealants and renders. The use of self adhering foam tape may only be used as a
      backing for sealants and renders. Comply with the relevant sections of the following
      British Standards and Trade Standards of the British Plastics Federation and the Glass
      and Glazing Federation.
      BPB/GGF COP 2 January, 1990 Code of Practice for the Survey and Installation of
      White High Impact Modified PVCu Windows.
      GGF Data Sheet 4.2 March, 1988 Glazing Techniques for Insulating Glass Units.
      GGF Data Sheet 6.1 April, 1990 Installation of Replacement Windows and Doors in
      Domestic Buildings.
      GGF Data Sheet 6.2 December, 1990 Code of Practice for the Survey and Installation
      of White High Impact Modified PVCu Windows.
      GGF Data Sheet 6.3 August, 1990 Security of Windows and Door Products.




HSG 3657C                                   - 29 -
      Plastic Windows/Rooflights/Screens/Louvres;                                    L12-L22
      Plastic Doors/Shutters/Hatches (Cont‟d)

752   FIXING OF PVCu WINDOWS: (Cont‟d)
      GGF Data Sheet 6.4 December, 1990 Additional Security for Windows and Doors in
      Domestic Buildings.
      BS 6262 1982 Code of Practice for Glazing of Buildings where not superseded by
      Preceding Documents.
      BS 8000:Part 7, 1990 Code of Practice for Glazing Building Regulations 1991
      Approved Document N - Safety Glazing BS 8213 Part 4:1990 windows, doors,
      rooflights, Part 4 Code of Practice for the Installation of Replacement Windows and
      Door Sets in Dwellings

753   FIXING OF PVCu DOOR SETS/ENTRANCE SCREENS:
      Fixing:
      The door frames are to be fixed with Cadmium plated Nr. F10/S120 Fischer bolts
      5 mm diameter, 120 mm long, or equal and approved fixing, screwed into surrounding
      brickwork or concrete through heads and jambs with a minimum of four fixings per
      jamb and two at head at centres not exceeding 450 mm. The Fischer or other bolt
      head shall be capped off with a White PVCu screw cap, fixed lights to be capped prior
      to glazing.
      The method of fixing is to be in accordance with the Code of Practice for the Survey
      and Installation of White High Impact Modified PVCu Windows (COP2), produced
      by British Plastics Federation, and the Glass and Glazing Federation, and other British
      Standards and Trade Standards indicated below where relevant. Frame fixings should
      coincide with the locating points of the locking system with suitable packing installed
      between the frame and the fabric of the building. The frame shall be packed at fixing
      points with the correct size of packing shim prior to fully tightening the fixtures.
      There should be no distortion of the frame due to tightening of the fixings, thus
      allowing thermal movement to occur without overstressing the welded joints or
      distorting the opening by bowing of the frame. Frame packing shims shall be dense
      plastic and purpose designed, they shall not be glazing wedges or cut timber.
      The glazing unit or other infilling should be packed adjacent to all locking and hinge
      points in addition to any conventional location.
      Expanding foam is not to be used as a primary form of fixing. Its use is only to fill
      voids or holes and act as a backing for sealants and renders.
      The use of self adhering foam tape may only be used as a backing for sealants and
      renders.
      Comply with the relevant sections of the following British Standards and Trade
      Standards of the British Plastics Federation and the Glass and Glazing Federation.
      BPF/GGD COP2, January, 1990 Code of Practice for the Survey and Installation of
      White High Impact Modified PVCu Windows.
      GGF Data Sheet 4.2 March, 1988 Glazing Techniques for Insulating Glass Units.
      GGF Data Sheet 6.1 April, 1990 Installation of Replacement Windows and Doors in
      Domestic Buildings.
      GGF Data Sheet 6.2 December, 1990 Code of Practice for the Survey and Installation
      of White High Impact Modified PVCu Windows.




HSG 3657C                                   - 30 -
      Plastic Windows/Rooflights/Screens/Louvres;                                    L12-L22
      Plastic Doors/Shutters/Hatches (Cont‟d)

753   FIXING OF PVCu DOOR SETS/ENTRANCE SCREENS: (Cont‟d)
      GGF Data Sheet 6.3 August, 1990 Security of Window and Door Products.
      GGF Data Sheet 6.4 December, 1990 Additional Security for Windows and Doors in
      Domestic Buildings.
      BS 6262, 1982 Code of Practice for Glazing of Buildings where not superseded by
      Preceding Documents.
      BS 8000:Part 7, 1990 code of Practice for Glazing.
      Building Regulations 1991 Approved Document N - Safety Glazing
      BS 8213:Part 4, 1990 Windows, Doors and Rooflights, Part 4 Code of Practice for the
      Installation and Replacement of Window and Door Sets in Dwellings.

770   PREPARED OPENINGS:
      Ensure that damp proof courses are positioned correctly in relation to frames and
      prevent displacement during fixing operations.

810   SEALANT JOINTS:
      All external perimeters shall be sealed with a low modulus silicone sealant at the
      abutment between the frame and the surrounding fabric of the structure. The sealant
      used shall be capable of adhering to PVCu and building materials, i.e. sand/cement,
      plaster, timber, brickwork, etc., to BS 5889.
      The silicone bead shall be applied evenly and have sufficient contact with both the
      frame and the structure. Before application the surfaces must be clean and dry.
      All protective tapes shall remain in tact prior to the silicone sealant being applied.
      Sealant manufacturer and reference: Dow Corning 796 or Siroflex Sirosil 50 silicone
      sealant.
      Colour: Dark Brown.
      Prepare joints and apply sealant as Section Z22.




HSG 3657C                                   - 31 -
        Plastic Windows/Rooflights/Screens/Louvres;                                    L12-L22
        Plastic Doors/Shutters/Hatches (Cont‟d)

900     PROCEDURE FOR REPLACEMENT OF WINDOW FRAMES:
        Neatly cut the internal finishings so as to cause minimum damage. Carefully remove
        and cart away window. Remove external mastic pointing throughout. Window
        boards and tiled sills where indicated on drawings to be retained.
        Windows, unless otherwise stated, are to be removed toward the external face.
        Prepare window openings to receive new. Fix new windows. The windows are to be
        fixed as described earlier in this Specification. Windows are to be fixed where
        possible to the existing window board or tiled sill and plaster line, make good to
        rendered reveals and external plaster as required and point up externally in mastic as
        previously descried at junction of window with surrounding structure and sealing with
        mastic, see Clause 810.
      - Provide and fix PVCu quadrant moulding/cover trims at junction of window with
        surrounding structure, secured in place with White adhesive.
      - Provide and fix PVCu channel moulding screwed to window section as window board
        support.
      - The PVCu trims, etc. are to be of the correct shade of White to match the selected
        window frames and are to be as manufactured by Veka Plc. Where existing window
        openings or frames have British Telecom cables, TV aerial cables, or the like, the
        window frame replacement rate must include for all costs and builders work in
        connection with rerouting such items as necessary. Upon completion the frames are
        to be washed down using general household detergents to remove building residue.
        The use of solvent based cleaners are prohibited. The use of cleaning and polishing
        agents shall be kept to an absolute minimum and specific advice on types and
        approved brands is to be obtained from the window frame manufacturer.

910     PROCEDURE FOR REPLACEMENT OF DOORS AND FRAMES:
        Neatly cut the internal finishings so as to cause minimum damage. Carefully remove
        and cart away door and frame. Remove external mastic pointing. Doors and frames
        unless otherwise stated are to be removed toward the external face.
        Prepare door openings to receive new. Supply and fix new doors and frames. The
        doors are to be fixed as described earlier in this Specification, make good to rendered
        reveals as required and point up externally in mastic as previous described.
        Allow for all frame extension to suit the existing opening, check condition. Door
        opening check condition to all dwellings.
        The PVCu trims etc. are to be of the correct shade of White to match the selected door
        frames and are to be as manufactured by Veka Plc. Where existing door openings or
        frames have door bell cables, or the like, the door frame replacement rate must
        include for all costs and builders work in connection with rerouting such items as
        necessary.
        Upon completion the frames are to be washed down using general household
        detergents to remove building residue. The use of solvent based cleaners are
        prohibited. The use of cleaning and polishing agents shall be kept to an absolute
        minimum and specific advice on types and approved brands is to be obtained from the
        door frame manufacturer.




HSG 3657C                                     - 32 -
        Plastic Windows/Rooflights/Screens/Louvres;                                   L12-L22
        Plastic Doors/Shutters/Hatches (Cont‟d)

920     FIXING IRONMONGERY GENERALLY:
      - Assemble and fix carefully and accurately using fasteners supplied by the
        ironmongery manufacturer, with matching finish and equivalent corrosion resistance.
      - Holes for components to be no larger than the minimum required for satisfactory
        fit/operation.
      - Protect ironmongery and adjacent surfaces as necessary to prevent damage.
      - At completion, check, adjust and lubricate as necessary to ensure correct functioning
        of all moving parts.




HSG 3657C                                     - 33 -
   ROOFS AND CHIMNEYS




HSG 3657C
ELEMENTAL REQUIREMENTS - ROOF COVERING

1. All existing roofs to be carefully stripped of slates/tiles and battens and rafters to be
   inspected for decay. Any timbers infected to be cut out and replaced with new.

2. Replacement roof coverings should be re-salvaged and re-used where appropriate, e.g.
   where adjoining.

3. Replacement concrete tiles shall be generally of similar design to existing and colour is to
   be agreed with Project Manager.

4. Provide and fit new reinforced roof felt with bottom layer into gutter.

5. Provide and fit 50 x 38 mm sawn softwood treated battens.

6. Lead valleys/flashings and all associated lead work including to chimney stacks is to be
   renewed.

7. Ventilation shall be provided as required by Building Regulations and firestops to be
   included.

8. A ventilated Dry Hip, Ridge and Verge System is to be used to BMBC Specification.

9. Chimney stacks will be assessed on their individual merits and remedial works carried out
   as necessary.

10. An appropriate flue liner shall be included where works are carried out to a chimney
    stack.

11. Allow for disconnecting and reconnecting gas fire by a CORGI registered fitter, where
    works are carried out to a chimney stack and a Landlords Certificate to be issued to
    Project Managers on completion of works.

12. Allow for removing and re-fixing of TV aerial and satellite dish to allow for works.




HSG 3657C                                      - 34 -
CHIMNEYS

1. In the event of failure the chimney stack is to be pulled down to a sound base and a new
   chimney stack re-built, including appropriate terminals, to original height. All associated
   lead work is to be replaced.

2. An appropriate flue liner shall be included where works are carried out to a chimney
   stack.

3. Allow for removing and refixing of TV aerial and satellite dish to allow for works.

Note: In all cases where a gas fire is situated this must be disconnected and reconnected by a
CORGI registered fitter and a Landlord's Certificate issued to Project Manager.

ROOF COVERING AND CHIMNEY SPECIFICATION

Concrete Tiles:

Marley equal or approved
Sandtoff equal or approved
Russell equal or approved
Colour: To be agreed by Project Manager

Slates:

Welsh Blue Slate or equal or approved

Fire Stop:

Manufacturers and ranges to be confirmed

Ventilation:

Manufacturers and ranges to be confirmed

Underfelt:

BS 747 Type 1F

Flue liner:

Manufacturers and ranges to be confirmed

Gas Cowl:

Manufacturers and ranges to be confirmed




HSG 3657C                                    - 35 -
   RENDER AND PLASTER




HSG 3657C
EXISTING RENDER/PLASTER

Existing render/plaster which is hollow, loose, soft, friable, badly cracked or affected by
efflorescence shall be carefully removed and cut back to horizontal and vertical edges.
Stained render/plaster shall be removed 300 mm beyond last point of visible staining.

Advise Project Manager if any built in timbers, structural deficiencies or sources of dampness
are revealed and obtain instructions. Thoroughly dry brush background and edges to remove
dust, loose material and efflorescence.

APPLY COATS to required thickness in one continuous operation between angles and joints
to provide an even and consistent appearance free from rippling, hollows, ridges, trowel
marks, cracks or crazing.

BONDING AGENTS of the PVA type to BS 5270, Part 1 shall be applied to all backgrounds
where necessary to obtain a satisfactory key. Application shall be in accordance with
manufacturer‟s instructions.

DUBBING OUT to correct inaccuracies shall be carried out in thicknesses of not more than
10 mm to same mix as backing coat. Surface of each dubbing out coat to be cross scratched
immediately after set, with each coat fully set before application of next.

RENDER shall comprise ordinary Portland Cement to BS 12 and ready mixed lime/sand to
BS 4721 with sand to BS 1199 Table 1. Backing coats shall be 8 mm thick mixed 1:¼:3
cement:lime:sand with waterproof additive and top coats 8 mm thick mixed 1:½:4½.

DRY DASHING shall be applied to the top coat whilst still wet using aggregate size
3 - 8 mm to BS 63, Part 2 to samples approved by Project Manager.

RENOVATING PLASTER shall be applied to all areas identified with Easy Bond slurry
coat, 11 mm base coat and 2 mm final coat of „Limelite Renovating‟ plaster trowelled to a
smooth finish.

LIGHTWEIGHT GYPSUM PLASTER shall comprise backing coat 11 mm „Carlite‟
Browning and final coat 2 mm „Carlite‟ finish to BS 1191 Parts 1 and 2 trowelled to a smooth
finish.




HSG 3657C                                     - 36 -
PLASTERBOARD AND SKIM to existing masonry walls shall comprise 9.5 mm or
12.5 mm plasterboard to BS 1230, Part 1, minimum 12.5 mm plasterboard to BS 1230 to
ceilings, secured at all edges with galvanised clout nails at 150 mm maximum centres and to
intermediate studding at 300 mm maximum centres. Boards to have Grey paper face
exposed, be fully supported on all edges, have joints taped, with expanded metal provided at
all changes of substrates. Gypsum thistle board finish to be applied 3 mm thick, trowelled to
a smooth and even surface.

BEADS/STOPS shall be securely fixed at all external angles and stop ends with neatly cut
mitres and return angles all set plumb, square and true to line and level. Bellcast beads
bedded on continuous silicone mastic shall be provided above damp proof course level, line
to adjoining properties and staggers.

DRYING shall be carefully controlled to avoid excess shrinkage with all coats kept moist for
at least 3 days.

THE STANDARD OF APPLICATION shall comply with BS 8000 Code of Practice for
plastering and rendering - workmanship on building sites.

GLAZED WALL TILES shall be of a single colour laid on thin bed adhesive applied in
accordance with manufacturer‟s instructions. Joints shall align perfectly both vertically and
horizontally and be filled with waterproof grout. Setting out shall ensure maximum tile sizes
and present a balanced appearance.

EXTERNAL INSULATION AND RENDER WORKS

Thickness of Insulation:

Minimum 40 mm rigid insulation board. The preferred system should endeavour to meet
0.35 „U‟ value and relevant Agreement Certificate. The following system components must
also have independent Agreement Certificates:-

(i)    Polymer cement dashing render and spar dash finish
(ii)   Smooth masonry paint

Hack off loose and spalling render and allow to dub out with proprietary polymer cement
dubbing render.

Supply and apply fungicidal wash in keeping with the manufacturer‟s instructions.




HSG 3657C                                    - 37 -
Include for providing and placing all necessary beads as recommended by the system
manufacturer, including a full depth stop bead at the boundary with a private property, and to
include for flashing top trim as per the requirements of the system manufacturer.

The Prime Contractor is to expose all cracking sufficiently so that the cracks can be slate
packed and pointed up. Then on the external leaf provide a 300 mm wide expamet mesh
covering the crack equally. Secure with brass screws and washers and render over.

Allow for careful removal of any services or attachments and reconnect or replace upon
completion of work.

Stepped Roof Lines: The Prime Contractor is to carry out a hammer test of the area - allow
for dubbing out accordingly if required. Apply render system excluding the insulation
element. Allow for all beads necessary to complete the work, finish to be Alpine - colour to
match property.

Allow for washing all window panes upon completion. Any render droppings to be cleaned
up immediately to eliminate staining of the surfaces. Include for fixing the bottom bellcast
and depth stop bead on silicone mastic and fixing pins at 300 mm centres. When the bellcast
and stop bead has been fixed there are to be as true to line and level as possible.

Wall surfaces should be free from protrusions and generally in place.

Bellcast beads to be used over doors and window heads to form drips, as detailed above.

The boards are to be 40 mm thick rigid insulation boards, dry fixed to the existing wall using
one centrally located pin (Ref.: ISO 90/100).

Supply and apply scrim adhesive and bed into the adhesive glass fibre reinforcing mesh.
Allow to mechanically fix through the scrim, adhesive and insulation boards penetrating
minimum 50 mm into the substrate at 450 mm centres and at 300 mm centres at building
corners and all window/door openings (Ref.: ISO 90/100 fixings). All fixing heads to be
covered with a 150 x 150 mm patch of alkali glass fibre reinforcing mesh bedded in adhesive.

Allow for providing and placing 15 mm compressible fibre board movement joints with
polysulphide mastic sealant over, positioned at the front and rear of the properties, behind
fallpipe positions and fixed in accordance with manufacturer‟s instructions.

Allow for providing surface mounted stop bead at positions of change in colour/texture in
accordance with the manufacturer‟s instructions.




HSG 3657C                                     - 38 -
EXISTING RENDER/PLASTER which is hollow, loose, soft, friable, badly cracked or
affected by efflorescence shall be carefully removed and cut back to horizontal and vertical
edges. Stained render/plaster shall be removed 300 mm beyond last point of visible staining.
Advise Project Manager if any built in timbers, structural deficiencies or sources of dampness
are revealed and obtain instructions. Thoroughly dry brush background and edges to remove
dust, loose material and efflorescence.

APPLY COATS to required thickness in one continuous operation between angles and joints
to provide an even and consistent appearance free from rippling, hollows, ridges, trowel
marks, cracks or crazing.

BONDING AGENTS of the PVA type to BS 5270, Part 1 shall be applied to all backgrounds
where necessary to obtain a satisfactory key. Application shall be in accordance with
manufacturer‟s instructions.

DUBBING OUT to correct inaccuracies shall be carried out in thicknesses of not more than
10 mm to same mix as backing coat. Surface of each dubbing out coat to be cross scratched
immediately after set, with each coat fully set before application of next.

RENDER shall comprise ordinary Portland Cement to BS 12 and ready mixed lime/sand to
BS 4721 with sand to BS 1199 Table 1. Backing coats shall be 8 mm thick mixed
1:¼:3 cement:lime:sand with waterproof additive and top coats 8 mm thick mixed 1:½:4½.

DRY DASHING shall be applied to the top coat whilst still wet using aggregate size
3 - 8 mm to BS 63, Part 2 to samples approved by Project Manager.

RENOVATING PLASTER shall be applied to all areas identified with Easy Bond slurry
coat, 11 mm base coat and 2 mm final coat of „Limelite Renovating‟ plaster trowelled to a
smooth finish.

LIGHTWEIGHT GYPSUM PLASTER shall comprise backing coat 11 mm „Carlite‟
Browning and final coat 2 mm „Carlite‟ finish to BS 1191 Parts 1 and 2 trowelled to a smooth
finish.

PLASTERBOARD AND SKIM to existing masonry walls shall comprise 9.5 mm or
12.5 mm plasterboard to BS 1230, Part 1, minimum 12.5 mm plasterboard to BS 1230 to
ceilings, secured at all edges with galvanised clout nails at 150 mm maximum centres and to
intermediate studding at 300 mm maximum centres. Boards to have Grey paper face
exposed, be fully supported on all edges, have joints taped, with expanded metal provided at
all changes of substrates. Gypsum thistle board finish to be applied 3 mm thick, trowelled to
a smooth and even surface.

BEADS/STOPS shall be securely fixed at all external angles and stop ends with neatly cut
mitres and return angles all set plumb, square and true to line and level. Bellcast beads
bedded on continuous silicone mastic shall be provided above damp proof course level, line
to adjoining properties and staggers.




HSG 3657C                                    - 39 -
DRYING shall be carefully controlled to avoid excess shrinkage with all coats kept moist for
at least 3 days.

THE STANDARD OF APPLICATION shall comply with BS 8000 Code of Practice for
plastering and rendering - workmanship on building sites.

GLAZED WALL TILES shall be of a single colour laid on thin bed adhesive applied in
accordance with manufacturer‟s instructions. Joints shall align perfectly both vertically and
horizontally and be filled with waterproof grout. Setting out shall ensure maximum tile sizes
and present a balanced appearance.

EXTERNAL INSULATION AND RENDER WORKS:
- Thickness of Insulation:
- Minimum 40 mm rigid insulation board. The preferred system should endeavour to meet
  0.35 „U‟ value and relevant Agreement Certificate. The following system components
  must also have independent Agreement Certificates:-

    (i)    Polymer cement dashing render and spar dash finish
    (ii)   Smooth masonry paint

-   Hack off loose and spalling render and allow to dub out with proprietary polymer cement
    dubbing render.
-   Supply and apply fungicidal wash in keeping with the manufacturer‟s instructions.
-   Include for providing and placing all necessary beads as recommended by the system
    manufacturer, including a full depth stop bead at the boundary with a private property,
    and to include for flashing top trim as per the requirements of the system manufacturer.
-   The Prime Contractor is to expose all cracking sufficiently so that the cracks can be slate
    packed and pointed up. Then on the external leaf provide a 300 mm wide expamet mesh
    covering the crack equally. Secure with brass screws and washers and render over.
-   Allow for careful removal of any services or attachments and reconnect or replace upon
    completion of work.

KITCHENS AND BATHROOMS:

If a property is required to have a full kitchen and/or bathroom replacement, then all walls to
the affected room, i.e. kitchen and/or bathroom, to receive full plaster skim (and decoration as
before described if required), to current specification standards.




HSG 3657C                                     - 40 -
STEPPED ROOF LINES:
- The Prime Contractor is to carry out a hammer test of the area - allow for dubbing out
   accordingly if required. Apply render system excluding the insulation element. Allow
   for all beads necessary to complete the work, finish to be Alpine - colour to match
   property.
- Allow for washing all window panes upon completion. Any render droppings to be
   cleaned up immediately to eliminate staining of the surfaces. Include for fixing the
   bottom bellcast and depth stop bead on silicone mastic and fixing pins at 300 mm centres.
   When the bellcast and stop bead has been fixed there are to be as true to line and level as
   possible.
- Wall surfaces should be free from protrusions and generally in place.
- Bellcast beads to be used over doors and window heads to form drips, as detailed above.
- The boards are to be 40 mm thick rigid insulation boards, dry fixed to the existing wall
   using one centrally located pin (Ref.: ISO 90/100).
- Supply and apply scrim adhesive and bed into the adhesive glass fibre reinforcing mesh.
   Allow to mechanically fix through the scrim, adhesive and insulation boards penetrating
   minimum 50 mm into the substrate at 450 mm centres and at 300 mm centres at building
   corners and all window/door openings (Ref.: ISO 90/100 fixings). All fixing heads to be
   covered with a 150 x 150 mm patch of alkali glass fibre reinforcing mesh bedded in
   adhesive.
- Allow for providing and placing 15 mm compressible fibre board movement joints with
   polysulphide mastic sealant over, positioned at the front and rear of the properties, behind
   fallpipe positions and fixed in accordance with manufacturer‟s instructions.
- Allow for providing surface mounted stop bead at positions of change in colour/texture in
   accordance with the manufacturer‟s instructions.
- Allow for providing and applying top render coats, polymer cement dashed render and
   aggregate dash and polymer cement Alpine finish as per the system provider‟s
   instructions and product Agreement Certificate. The render must be a proprietary
   polymer cement modified render, pre-mixed and containing no less than 3% polymer.
   Alpine finish to be as the above and finished with a masonry paint. The masonry paint
   must have an Agreement Certificate for a performance lifespan of up to 15 years, and
   suitable to be applied to polymer cement renders. The Alpine finish must also be
   incorporated within the system Agreement Certificate.
- Allow for rendering over existing render where the removal of non-defective existing
   render, following inspection by Structural Engineer, would structurally damage the
   existing substrate render system as above.

RENDER:

Manufacturer:

Alumasc
MR Render
Wetherby or
Other Equal Approved




HSG 3657C                                     - 41 -
      RAINWATER GOODS




HSG 3657C
RAINWATER GOODS

All guttering to be 112 mm diameter and all downpipes to be 68 mm diameter.
NOTE: The gutter diameter may have to be reduced if affected by an adjoining private
property

STANDARDS/approvals
British Standards
BS EN ISO 9002:1994 Quality Systems. Model for Quality Assurance in production,
installation and servicing.
BS EN 607:1996 Eaves gutters and fittings made of PVCu. Definitions, requirements and
testing.
BS EN 1462: 1997 Gutter brackets. Classification, requirements and testing.
BS EN 12200: 2000 Rainwater piping systems. Specification for pipes, fittings and the
system.
BS 2494:1990 Specification for elastomeric seals. Requirements for joints in pipework and
pipelines.
Types D - Drainage
T - Above ground Thermoplastic Rubber.
BS EN 681:1996 Elastomeric seals. Material requirements for pipe joint seals used in water
and drainage applications.
Part 1. Vulcanized rubber
Part 2. Thermoplastic elastomers.
BS 4255: Part 1:1986 Specification for Non-cellular gaskets for buildings.
BS 4660: 2000 Ancillary fittings of nominal sizes 110 mm - 160 mm below ground gravity
drainage and sewerage.
BS EN 1401-1: 1989 Plastic Pipe Systems for non-pressure underground
BS 4514:1983 Unplasticised PVC, soil and ventilating pipes, fittings and accessories.
BS EN 12056-3 Gravity drainage systems inside buildings.
Part 3: Roof drainage layout and calculations.
Load Bearing
All gutter brackets to be subjected to simulated load bearing tests in accordance with clause 6
of BS EN 1462: 1997.
In areas where particularly high snow falls and severe icing might be expected
BS EN 1462: 1997 recommend that heavy duty brackets (load bearing class H) should be
fitted.
This precaution should also be considered wherever sliding snow might cause damage or
injury to structures or persons below. Support brackets should be fixed at as specified in
section 1.02 „Performance and Properties‟.
Building regulations approved document ‘H’ 3




HSG 3657C                                     - 42 -
BS EN 607 Requirements
Wall Thickness
Gutter
BS EN 607 Min 2.2
Downpipe
Min. Max.
BS EN 12200 1.8 2.3
Moulded Fittings
BS EN 607 Min. 2.20
Materials
PVCu including no re-worked material
Colour Fastness - Rainwater and Soil
Products
All products to be artificially aged in accordance with Method A. ISO/DIS
4892-2 and tested in accordance with EN 20105-402 for colour fastness
Vicat Softening Temperature
BS EN 607/12200 Min 75°C
Grey average 84.8°C
Brown average 82.5°C
Black average 83.1°C
Heat Reversion of Gutters
BS EN 607 Max 3.0%
Heat Reversion of Downpipes
BS EN 12200 Max. 3.0%
Impact Resistant Test
BS EN 12200 Max. 10% Failure
Dead Weight Test of Gutter Brackets
Heavy Duty 76 kg
Standard Duty 50 kg
Below 80 mm opening - no testing
BS EN 1462 Max. 5 mm deflection after test
Leak Test
BS EN 607 No leaks
Further Properties
Specific Gravity 1.35-1.45
Co-efficient of
Linear Expansion 7 x 10-5/ml°C
Water Absorption Negligible
Oxygen Index 42%
Chemical Resistance
The material is to be virtually unaffected by solutions of inorganic acids, alkalis and salt and
is resistant to many organic chemicals. It may be softened by some organic materials such as
Ketones and aromatic compounds. It will not corrode.
Fire Resistance
Materials used in Rainwater Systems are to be self extinguishing.




HSG 3657C                                     - 43 -
DESCRIPTION
All gutters, pipes and fittings, unless otherwise specified, are to be manufactured in
un-plasticised polyvinyl chloride (PVC-U). All seals used within fittings are to be produced
in a rubber material to BS 2494 Type D:1990 or manufactured in accordance with relevant
British Standards.

FINISH
All PVC-U products in the system have a smooth, easy-to-clean surface finish.

COLOURS - Black

CHEMICAL PROPERTIES
It is essential that fascia boards treated with preservatives such as creosote are left for at least
48 hours to dry before fixing commences.

DURABILITY
Goods to have a life expectancy to comply with the Decent Homes criteria.

EFFECT OF WIND
To prevent the wind from blowing rainwater behind the gutter and creating potential water
damage to property, ensure that roofing felt is fitted and extended to below the gutters‟ rear
edge.

STORAGE
Block bundles - Store block bundles, loose gutter or pipe on a reasonably flat surface free
from sharp projections. Block bundles can be stored up to three high without extra side
supports or bearers. In addition, block bundles will remain free standing when cut. Care
should be taken when gutter or pipe straps are removed from bundles as the straps are under
considerable tension and may flail when cut. Do not store any wrapped products in direct
sunlight.

HANDLING
Always be careful to avoid damage when handling gutter or pipe. Excessive scratching or
scoring of gutter and pipe not only affects the appearance but can also affect the joint sealing.
Cold weather affects the impact strength of most plastics so extra care should be taken when
handling gutter and pipe in wintry conditions. Load and unload loose gutter or pipe by hand.

LUBRICANTS
The use of silicone lubricant on rainwater systems will assist assembly and prevent juddering
noises caused by gutter movement across dry joints. Never use washing up liquid or similar
substances to lubricate gutter seals.

MAINTENANCE
Regularly clearing gutters of leaves, silt or other debris will extend the life of the gutters and
ensure continuing efficient performance.




HSG 3657C                                       - 44 -
MECHANICAL
PVC-U has good flexural and tensile strength characteristics, but as with all types of gutter,
ladders should be held off gutters and brackets to avoid damage.

SNOW LOADING
All systems to withstand heavy snow loads in accordance with BS EN 1462 and
BS EN 12056-3, however, in areas subject to heavy snow fall it is recommended that Heavy
Duty Brackets are used. When fixing beneath a steeply pitched roof or in areas subject to
heavy snow, it is also recommended that fixing centres of brackets are reduced to 750 mm.
Consideration may also be given to fitting snow guards to eaves of pitched roofs to prevent
sliding snow or ice causing damage to persons or structures below (as recommended in
BS EN 12056-3).

THERMAL MOVEMENT
Gutter joints to be designed to accommodate normal thermal movement without leakage,
distortion or displacement from fittings. Particular care is necessary to ensure that gutters are
assembled to the insertion lines engraved inside each fitting. The coefficient of thermal
expansion of PVC-U is 0.05 mm/metre/ºC.




HSG 3657C                                      - 45 -
            STRUCTURAL




HSG 3657C
STRUCTURAL REQUIREMENTS

Any dwelling identified through surveys, or other methods to be confirmed, as containing
structural defects to be surveyed by Chartered and Warranted Structural Engineer and any
report to be inspected and approved by BMBC/Berneslai Homes and extent of works to
dwelling to be agreed prior to works being carried out.

Typical structural repair specifications to be found in Appendix D.




HSG 3657C                                    - 46 -
            QUESTIONS AND
              ANSWERS




HSG 3657C
QUESTIONS AND ANSWERS TO SUPPORT ELEMENTAL REQUIREMENTS

Question/Answers

Are bathroom floors to be covered with plywood and vinyl if a new bathroom suite is
fitted?

Flooring is now included in the bathroom as is levelling of floors if necessary.

If a tenant asks for their fireplace to be removed during the kitchen replacement can
this be included within the kitchen refurbishment?

No, the only circumstance that a fireplace could be removed would be if the kitchen did not
have sufficient room to allow the correct capacity of units to be fitted and only with the
approval of BH.

Is painting to be included in the pricing up of kitchens and bathrooms?

Pricing of painting is now to be included in the kitchen or bathroom replacements.

Can sub-consumer boards be used instead of exchanging a perfectly good board purely
because it needs additional MCB or RCD’s?

Sub-consumer boards can be used if an existing board lacks only MCB or RCD‟s. The
connector block must also be retained.

Are freezers and fridges to be on a dedicated circuit?

Dedicated circuits must be provided for fridges and freezers.

Is an isolation switch needed for sockets hidden behind White goods?

Yes, an isolation switch is required; the switch must also include the name of the appliance
that it works.

If a central heating back boiler fails under the decent standard what is the preferred
option?

The preferred option is to, where possible, install a wall mounted central heating and new gas
fire. This option is preferred as it improves the efficiency of the heating system, reduces the
risk to tenants from open flue boilers and reduces the nuisance to tenants from the provision
of combustion, i.e. cold draughts.




HSG 3657C                                     - 47 -
If the central heating back boiler is to be replaced by another system can the boiler
and/or fire be left insitu?

No. The boiler and fire should be considered as an integral unit, the flue and installation of
the fire is part of the boiler. Therefore, if the boiler, or fire, fails the decent standard then the
whole unit fails. It also contravenes CORGI guidance on this matter.

On removing the central heating back boiler and fire do we fit a new fire and what type
of flue should be used?

A new gas fire of the type specified by BH should be fitted to a properly constructed opening
in place if the removed unit. The original „Copex‟ liner used for central heating back boiler
must be removed, the design life of such a liner is 15 years and therefore cannot be presumed
to be safe for continued use. The brick flue should then be checked and should only be fitted
if the chimney fails the test carried out by your gas engineer. If a flue liner is required a
Copex liner and box (if required) should be installed.

Do BH have a preferred boiler choice within each type included in the gas boiler
specification?

Yes, BH do not have a preferred boiler choice. It can be selected from our gas boiler
specification.

Is it correct BH specification requires one twin switched socket outlet to all bedrooms
except the main bedroom, where two twin switched socket outlets are specified?

Yes. Only the main bedroom is specified for two twin sockets.

Do we fit TRV at high level for elderly tenants?

TRV should be fitted a high level as stated in Electrical Requirements Central Heating item 5.

Can we run the condensation from boilers to a soakaway?

Yes, if no suitable drain is in the location and it must meet the following design. Depth to be
450 mm lined with 100 mm diameter plastic soil pipe. Condensate pipe to be in 22 mm
overflow pipe and lagged on external runs. If the pipe is run in 32 mm waste pipe then
lagging is not required. Pipe to terminate into soakaway infill. Infills are to be of a larger
size than the diameter of the pipe used. Soakaway to be covered with permanent fitted cover
to prevent loss of infill.




HSG 3657C                                        - 48 -
Asbestos - Questions and Answers

Questions/Answers

How will we know whether asbestos is present in the properties that we are working on?

The survey results do not indicate that asbestos is present but using the type 1 survey a type 2
survey is to be carried out by the Prime Contractor.

The type 2 survey will indicate whether there is asbestos present in the dwelling or not. If
present, the report will identify the locations and types found.

However, until you receive the report you should assume that textured coatings have asbestos
content and price accordingly.

Do we need to supply method statements for each property?

No, you should supply a method statement relevant to the properties on the estate you are
working on. Once this has been accepted by our safety advisor there wont be any further
need to resubmit further method statements as long as you are not changing the method of
operation carried out.

If we have to chase a wall with textured coatings, how should the wall be left?

If you are chasing through a textured coating that has been identified as containing asbestos
then the wall should be re-skimmed in its entirety. This should then be identified within your
Health & Safety plan so that BH can update their records.




HSG 3657C                                     - 49 -
HEALTH AND SAFETY INFORMATION - DECORATIVE COATINGS (ARTEX)

Following recent developments concerns have arisen within Council housing stock relating to
decorative coatings (e.g. ARTEX) that may contain 1 – 4% Chrysotile (White) asbestos
fibres.

This information/guidance must be adhered to when carrying out the following types of
remedial works, (NOT THE REMOVAL OF DECORATIVE COATINGS) on ceilings
and walls, in connection with the above.

Electrical Rewiring                  Removal of existing fittings.
                                     Drilling holes for cables.
                                     Fitting consumer units, switches, sockets, trunking etc.

Smoke, fire, gas and security        Drilling holes for cables.
alarms                               Fitting detection devices and trunking etc.

Central Heating                      Removal of radiators, fittings etc.
                                     Fixing boilers, radiators, and pipe clips etc.

General internal refurbishment       Any works that may disturb or penetrate decorative
                                     coated surfaces.


Works to Walls/Ceilings

Decorative coatings may contain Chrysotile (White) asbestos fibres; it must therefore be
assumed that decorative coated walls/ceilings have asbestos content, unless proven otherwise,
due to the large volume of sampling required establishing this information all the above listed
works must be carried out under controlled procedures, (see Appendix C - Guidance
Procedure.)

Any works that may substantially disturb decorative coated surfaces e.g. (demolition, damp
proofing, chasing for electrical fittings etc.) must be sampled prior to any works carried out
in order to establish if Chrysotile (White) asbestos fibres are present.

Should any further advice/information on the removal of decorative coatings be required please
contact Bernice Bowler, Telephone: 01226 774355 or Eric Hebden, Telephone: 01226 774354
at Property and Procurement, Springfield House, Springfield Street, Barnsley, S70 6HH.




HSG 3657C                                     - 50 -
              APPENDIX A

       MECHANICAL SPECIFICATION




HSG 3657C
                                        APPENDIX A

        PERFORMANCE, MATERIALS AND WORKMANSHIP SPECIFICATIONS

                                          INDEX

                                                              PAGE NR.

1.00   Scope of Works                                         A/2

2.00   Design Criteria                                        A/3

3.00   Standard of Workmanship                                A/4

4.00   Safety of Site Works                                   A/5

5.00   Regulations                                            A/6

6.00   Builders Work                                          A/7

7.00   Works to Existing Installation                         A/8

       NEW INSTALLATIONS

8.00   Works to All Dwellings

       8.01   Gas Meters                                      A/9
       8.02   Gas Appliances                                  A/9 - A/10
       8.03   Radiators                                       A/10
       8.04   Radiator Valves                                 A/10 - A/11
       8.05   Circulating Pumps                               A/11
       8.06   Heating Feed and Expansion Tanks                A/12
       8.07   Hot Water Cylinders                             A/12
       8.08   Pipework, Fittings and Supports                 A/13 - A/14
       8.09   Insulation                                      A/14
       8.10   Venting and Draining                            A/14
       8.11   Controls                                        A/15
       8.12   Water Treatment                                 A/15
       8.13   Flushing Out                                    A/16
       8.14   Frost Damage                                    A/16
       8.15   Testing and Commissioning                       A/16 - A/17
       8.16   Electrical Works                                A/17 - A/25

9.00   Works to Some Dwellings (As Identified From Surveys)   A/26 - A/27




HSG 3657C                                  A/1
                                          APPENDIX A

         PERFORMANCE, MATERIALS AND WORKMANSHIP SPECIFICATIONS


1.00   Scope of Works

       The Contractor shall allow for surveying all properties listed under the relevant Contract
       heading in Appendix 2D of this document to ascertain the heating requirements for each
       dwelling

       Subsequently the Contractor will remove the existing heating system and design, supply,
       install, commission and test a new central heating system as stated below dependant on the
       tenants choice of fuel

       Gas        - „Y‟ Plan fully pumped gas fired low pressure hot water heating system serving
                    a network of pressed steel radiators

                  - Condensing Combination System

       The work shall comprise the whole of the labour, plant and materials necessary to form a
       complete installation together with such tests, adjustments and commissioning as are
       prescribed subsequently and as may otherwise be required to give an effective working
       installation

       The words “Complete Installation” shall mean not only the major items of plant and
       apparatus conveyed by this Specification, but all the incidental sundry components and
       builders work necessary for the complete execution of the works and for the proper co-
       ordination of the installation, together with their labour charges. Such sundry components
       and builders work will be deemed included, whether or not described within this document




HSG 3657C                                     A/2
2.00     Design Criteria

2.01     The following temperature criteria shall be applied based on ambient conditions of
         -2.5ºC and the given air change rates:-

Lounge/Dining Room                                      22ºC      1.5 Air Changes Per Hour

Bedrooms                                                22ºC      1 Air Change Per Hour

Kitchens, Hallways, Stairs and Landings                 18ºC      2 Air Changes Per Hour

Bathrooms                                               22ºC      3 Air Changes Per Hour

W.C.‟s                                                  18ºC      3 Air Changes Per Hour

2.02     Heating System design flow temperatures:-

         For Boiler System - 82ºC maximum

         For DHWS            - 60ºC maximum

2.03     Water flow rates through the distribution system shall be such as to ensure no more than a
         10ºC temperature gradient exists across flow and return anywhere in the system

2.04     The total output capacity of the boilers shall not be less than 125% of the maximum design
         heat load

2.05     Noise generation within the system will not be permitted. In any event a maximum pressure
         drop of 300 pa/m length of pipework shall not be exceeded for any part of the system

2.06     Mains cold water velocity shall not exceed 1.5 m/s in any part of the system

2.07     All other aspects of the design process shall strictly adhere to the Guides to Current Practice
         as defined by the C.I.B.S.E.




HSG 3657C                                       A/3
3.00   Standard of Workmanship

3.01   British Standards

       Where a British Standard or Code of Practice is applicable to materials or workmanship the
       latest published standard or Code of Practice is to be complied with

3.02   Quality of Materials

       Materials shall be of the quality specified. Where quality is not specified, these shall be in
       accordance with British Standards as a minimum. Where quality is not specified and no
       British Standard is appropriate, they shall be to the satisfaction of the Project Manager

3.03   Standard of Workmanship

       Workmanship shall be entirely suitable and appropriate to the nature of the works and to the
       highest standards laid down by the operative‟s trade institutions

3.04   Samples

       Samples of materials proposed to be used shall be promptly provided when requested by the
       Project Manager. Any material not corresponding with the sample may be rejected




HSG 3657C                                      A/4
4.00   Safety of Site Works

       The work shall be carried out by fully skilled and appropriately trained operatives with the
       assistance of trainees and apprentices; no more than one trainee or apprentice to each
       operative will be permitted

       All staff must be able to operate tools and plant in strict accordance with all relevant Health
       and Safety Legislation especially those operated by electricity. All power tools shall be
       double insulated and shall operate at a maximum of 110 volts fed via a centre tapped
       transformer using only purpose made high impact toughened flexible cable

       All materials and plant, especially hand tools and flexible electricity supply cables, shall be
       maintained in a good and safe condition. Any damaged or faulty equipment shall be
       immediately repaired or replaced

       All extension leads plus leads to equipment must be continuous throughout their entire
       lengths, no joints will be permitted, and leads must be fitted with appropriate plugs and
       sockets. Where extension leads or lead to equipment is energised at the supply voltage, the
       leads shall be protected by a B. and R. plughead, or other approved plughead incorporating
       an R.C.D. rated at a maximum of 30 mA

       All stocking, placing and storing of materials or furniture shall be done effectively to ensure
       maximum safety and minimum danger. Materials must not be stored in any access or exit
       areas used by the householder, especially fire escape routes

       The use of impact guns or similar will not be permitted

       Nails must be removed when floorboards are first taken up

       Live terminals on any apparatus must never be left in an exposed condition




HSG 3657C                                      A/5
5.00   Regulations

       The installation(s) shall comply with all relevant statutory instruments and regulations
       (unless otherwise stated in this specification or on any drawings) and in particular with the
       following:-

       1)     The I.E.E. Regulations for the Electrical Equipment of Buildings (certificate to be
              provided)

       2)     Regulations under the Factories Act

       3)     Regulations under the Electricity Act

       4)     COSHH Regulations

       5)     Gas Safety Regulations (Installation and Use) 1998

       6)     2005 Relevant Building Regulations

       7)     BS 5449:1990 Forced Circulation Hot Water Central Heating Systems for Domestic
              Premises

       8)     The whole of the electrical works shall be carried out in strict accordance with the
              BS 7671 Requirements for Electrical Installations and any amendments as issued by
              the Institution of Electrical Engineers/BSi (hereinafter referred to as the I.E.E.
              Wiring Regulations), the Electricity Supply Regulations 1988 (as amended 1990),
              and the Electricity at Work Regulations 1989

       9)     Any special regulations issued by, or requirements of the Local Electricity, Gas or
              Water Undertakings. Where necessary arrange for any tests required by them and
              include for any expenses incurred by such tests

       10)    The individual tradesmen used for the installation works must be „CORGI‟,
              „ACOPS‟, A.C.S., registered, company registration alone is not acceptable.
              Tradesmen are to be competent in the field of work they are carrying out. The
              Contractor shall, if requested, supply to Project Manager proof of qualification for
              any or all operatives

       11)    On completion all dwellings shall comply with the Clean Air Act

       12)    All works shall be undertaken in accordance with the Health and Safety at Work Act
              1974 and all obligations under the Act and other regulations governing building sites
              including the provisions of the Factories Act 1961 and Construction Regulations




HSG 3657C                                     A/6
6.00   Builders Work

6.01   Brickwork and Blockwork

       Sand
           Sand for mortar shall comply with BS 1200, Table 1

       Cement
          Cement is to be ordinary or rapid hardening Portland Cement in accordance BS 12

       Water
          Water shall be clean, fresh water, free from impurities

       Bricks
           Bricks shall comply with BS 3921

       Mortar
          All quantities of materials are to be accurately gauged and only sufficient quantities for
          immediate use are to be mixed. Gauged mortar shall comprise six parts sand, one part
          lime and one part cement

6.02   Finishings

       Sand
           Sand for plastering shall be natural sand complying with BS 1199, Table 1

       Cement
          Cement is to be ordinary Portland Cement in accordance with BS 12

       Water
          Water shall be clean, fresh water, free from impurities

       Plaster
           Plaster shall be pre-mixed gypsum to BS 1191:Part 2

       Plastering
           Plastering is to be carried out in two coats to a thickness to match existing plaster. The
           surface to be plastered is to be cleaned down, raked for key if necessary and well
           wetted before plastering. Joints to existing plaster are to be carefully made to ensure a
           smooth and even wall surface. All plastering carried out in any dwelling shall be
           undertaken by competent tradespersons

6.03   Carpets and Furniture

       It shall be the Contractor‟s responsibility to move all furniture and carpets as and when
       required. Refer to Preliminaries Clause A35/130

       Note: All foam backed carpets, vinyl flooring and laminate flooring to be brought to
             attention of Project Manager before commencing works.




HSG 3657C                                     A/7
7.00   Works to Existing Installation

7.01   Drain down the existing system and remove all redundant boilers, cylinders and tanks,
       Elson tanks, pipes, radiators, ductwork, grilles and ancillary equipment, redundant radiator
       bracket wood pattresses, except where to be retained; make good structure and finishings
       disturbed

7.02   Remove existing fires and appliances to rooms where new appliance is to be fitted; prepare
       openings to receive new installation; make good wall finish in 2 coat plaster to new areas of
       brickwork and existing where disturbed and finish smooth with existing wall finish; provide
       and fix timber skirtings to match existing fixed with sheradized screws and plastic plugs.
       Skirtings on chimney breast to be in one full length

7.03   Sweep all chimney flues to dwellings, including redundant flues. Flues must be swept by a
       Professional Chimney Sweep. The Contractor is to submit a signed statement, for each
       dwelling, stating that the chimneys have been swept. Any noticeable defect in the chimney
       or terminal must be brought to the attention of the Project Manager or his representative.
       Special attention is to be given to the protection of tenants furniture

7.04   Where an electrical alteration or addition to an installation is to be carried out, it is the
       responsibility of the person carrying out the work to see that the alteration or addition
       complies with the Wiring Regulations. Where compliance is prevented by defect in part of
       the existing installation which is related to, but forms no part of the alteration or addition,
       the alteration or addition should not be connected and the person ordering the work should
       be informed of the defect. For this reason, before undertaking an alteration or addition, a
       preliminary inspection of the existing installation should always be made

7.05   It must also be verified that the cables, protective devices and earthing arrangements of the
       existing electrical installation would be adequate to maintain compliance with the
       regulations after alterations or additions have been completed




HSG 3657C                                      A/8
8.00   Works to All Dwellings

8.01   Gas Meters

       Where gas services are required to be installed or replaced, the Contractor should note: No
       work is to commence in the dwelling until it is certain that a live gas supply exists into the
       dwelling. Should a gas service/meter be required it shall be the Contractor's responsibility
       to liaise with the Regulatory Body and arrange installation of a meter and service before
       commencing installation work

8.02   Gas Appliances

       Where a new gas appliance is to be installed:-

       Gas Boiler Choices

       Wall Condensing O/V
       Pott Promax
       Vaillant Ecomax Pro
       Glow-Worm HX1

       Combination Boiler/Condensing

       Glow-Worm CX1 30
       Vokera Hydra
       Vaillant Ecomax

       Independent Fires

       Baxi Brava
       Baxi Baroque Super
       Valor Black Beauty Slimline

       Build up the opening in the chimney breast in common brickwork in gauged mortar to suit
       boiler for the appliances specified as per the manufacturer's instructions and Barnsley
       M.B.C.'s Installation Drawing Detail STD/SK101 including new precast concrete lintel
       over. Replace all disturbed work

       The Contractor shall include for carefully removing existing vertical pipe boxings to
       chimney breast and refixing same on completion and testing of the new installation

       Any existing vents previously fitted for combustion purposes shall be removed and
       brickwork made good to match surround

       Chimneys shall be lined with 127 mm triple lock deluxe stainless steel flexible flue liner as
       manufactured by Rite Vent Ltd., Tyne and Wear

       A Rite Vent Cast Aluminium GCI Terminal Type FR 125T shall be fitted at the top of the
       liner and the terminal clamp plate shall be neatly embedded in sand and cement mortar (3:1)
       at the top of the chimney stack



HSG 3657C                                      A/9
8.00   Works to All Dwellings (Cont‟d)

8.02   Gas Appliances (Cont‟d)

       Provide and install a suitable gas supply from the meter location to serve boiler, cooker and
       gas fire point as may be required using pipework in accordance with section 8.10 of this
       Specification

       To comply with Building Regulations an automatic by-pass valve shall be provided in the
       pipework layout to relieve the system in periods of very low load

8.03   Radiators

       Supply and fix steel panel radiators to the sizes as required

       Generally radiators shall be arranged for bottom opposite end connections (B.O.E.) except
       in the case of the disabled accommodation which shall be to T.B.O.E. connections

       In all cases radiators shall be complete with manufacturers brackets, air vent and plug. All
       radiator valves shall be vertically aligned

       At least three radiator vent keys shall be provided for each dwelling

8.04   Radiator Valves

       Radiator valves shall be as scheduled below and shall consist of thermostatic flow valves
       fitted to all radiators except those in bathrooms and shall be on the flow connection with
       lockshield valve on the kitchen connection incorporating integral drain-off facility. All
       valves shall be chrome finish. Isolation caps for each T.R.V. to be left with tenant

       Thermostatic valve temperature range to be at least 5-28°C




HSG 3657C                                     A/10
8.00   Works to All Dwellings (Cont‟d)

8.04   Radiator Valves (Cont‟d)

       The following valves and cocks shall be:-

       Thermostatic Radiator Valves             Peglers/Drayton TRV4 Reverse Flow (Angle Head)

       Bathroom W/Head Radiator Valves          Peglers Terrier 367WH/CP

       Lockshield Radiator Valves               Peglers Terrier 367DLS/CP

       Gate Valves                              Peglers GM 63

       Stopcocks                                Peglers GM 59

       Stopcock (Incoming Mains)                Peglers GM 69

       Ball Valves                              Portsmouth Pattern With Vertical Drop Arm
                                                Attachment

       Draincocks                               Peglers 833LS

8.05   Circulating Pumps

       Provide and fix in the flow pipe from the boiler, in a convenient position for the purpose of
       attendance of maintenance, a variable head, glandless, in-line circulator having a mid-range
       duty sufficient to meet both maximum heating and hot water loads with a system
       temperature drop of not more than 11°C based on a boiler flow temperature of 82°C

       Pumps shall have Gland type isolating valves on both inlet and outlet

       Suitable units would be as manufactured by Grundfos Pumps Ltd., UPS range or equal
       approved




HSG 3657C                                    A/11
8.00   Works to All Dwellings (Cont‟d)

8.06   Heating Feed and Expansion Tank

       Supply and install in the roof space of each dwelling on a close boarded base 1 Nr.
       18 litre/4 gallon nominal capacity insulated feed and expansion cistern

       Each cistern shall incorporate:

       (i) Close fitting insulated lid
       (ii) 15 mm ballvalve and ball
       (iii) 22 mm copper overflow pipe to outside
       (iv) 15 mm cold feed connection off side of tank (not bottom)
       (v) Suitable open vent discharge through tank lid
       (vi) 15 mm isolating valve to be installed to mains cold water pipework

       N.B.

       Where heating circulating pipes are in the roof space a minimum of 600 mm 'Flood head'
       shall exist between the highest point on the mains and the bottom of the Feed and
       Expansion Tank

8.07   Hot Water Cylinder

       Gas Systems

       Provide and locate in the linen cupboard of each dwelling:

       1 - Vertical indirect high efficiency copper cylinder, i.e. 80 litre Albion Superduty to
       BS 1566/1984:Part 1 Grade 3, suitable for a working pressure of 10 m head and having a
       heat exchange capable of heating the contents from 10°C-60°C in 20 minutes based on both
       flow and return temperatures as previously defined

       The cylinder shall be supplied complete with at least 50 mm thick Urethane foam applied at
       the factory. All primary and secondary connections shall be Brass as normal standard

       A 2¼” screwed boss for an immersion heater shall also be provided near the crown of the
       cylinder




HSG 3657C                                    A/12
8.00   Works to All Dwellings (Cont‟d)

8.08   Pipework, Fittings and Supports

       All pipework shall be L.G. Copper tube to BS 2871:Part 1, to be 'X' Kite Marked. No
       system pipe should be smaller than 15 mm

       Any pipework, which by necessity must be run in floor screeds shall be plastic covered
       'Kuterlex' pipe

       Fittings shall be of the capillary type to BS 864:Part 2 and manufactured entirely from
       copper having an integral solder ring, being potable type, all surplus solder to be removed
       after soldering. Caustic and/or self cleaning fluxes shall not be used

       Tubes shall be reamed after cutting and shall be free from burrs, rust, scale and other defects
       and shall be thoroughly cleaned upon erection

       Open ends left during the progress of the work shall be blanked off with purpose-made
       metal or wood plugs or blank counter flanges. The use of paper, rag or other unsuitable
       material will not be permitted

       All pipework shall follow lines of walls, floor and ceilings, etc.

       Joints shall not be made in the thickness of any floor, wall or ceiling and pipework shall not
       be embedded in the structure or floor

       All pipes passing through walls, floors or ceilings shall be provided with sleeves cut to
       allow a projection of 3 mm beyond the finished wall. The sleeves shall be of the same
       material as the tube

       All pipework shall be secured via use of „Unifix‟ lockable plastic clips

       Spacing brackets shall be sufficient to ensure adequate support of pipework but in all cases
       shall not exceed the distances detailed below:

       Intervals for          Intervals for
       Nominal Bore           Horizontal Runs         Vertical Runs

       15 mm                     1.5 m                  1.8 m
       22 mm and 28 mm           1.8 m                  2.4 m
       35 mm - 54 mm             2.4 m                  3.0 m
       67 mm and above           3.0 m                  3.6 m

       Where in contact with copper pipework, all brackets and clips shall be constructed from
       plastic with lockable covers or brass/copper of same design. These shall be „Unifix‟ if of
       plastic construction

       All low level pipework in rooms shall be supported at intervals not exceeding 1.5 m

       In addition to above, all vertical pipes shall be supported at the base and at least one other
       joint. Branches from risers shall not be used to support the riser


HSG 3657C                                     A/13
8.00   Works to All Dwellings (Cont‟d)

8.09   Insulation

       Pipework in the roof space and below suspended ground floors shall be insulated with
       25 mm thick Class 1and above the ground floor ceiling shall be insulated with 9 mm thick
       Class 1. All joints shall be fully sealed to form an integral whole using adhesive

       All existing hot and cold water pipework and cold water storage tanks in roof spaces are to
       have their insulation renewed. All new insulation shall be to current HEES standards

       All pipework in cylinder cupboard to be insulated with 9 mm insulation, which is to be
       secured in placed - Part L

8.10   Venting and Draining

       As far as practically possible all pipework shall be graded to allow the system to be vented
       through the open vent and the radiators

       Where this cannot be achieved, line size air bottles shall be provided fitted with 15 mm air
       cocks

       In roof voids suitable automatic air vents shall be provided ½” Flamco Flexvent brass
       bodied (3/8”) with waste connector 6 mm copper discharge to outside

       Draincocks shall be provided to all low points in the system to ensure that the whole
       contents of the system can be drained

       Ventair 22 mm air separator or similar Myson to be used where appropriate

8.11   Controls

       Gas Fired systems shall be as 'Y' Plan fully pumped installations incorporating a
       'mid position' 3 way valve fitted downstream of the pump outlet

       The following controls shall be provided:-

       (i) Mid-position Valve Body or similar approved which is fully compatible with Wiring
           Centre etc.

       (ii) Valve Actuator

       (iii) Room Thermostat shall be Drayton RTS 2 with L.E.D. on indicator or similar approved

       (iv) Cylinder Thermostat (carefully fitted through cylinder insulation)

       (v) Wiring Centre




HSG 3657C                                    A/14
8.00   Works to All Dwellings (Cont‟d)

       A Randall Set 3E Electronic Programmer, to be installed in location to be agreed, giving at
       least 2 - „on‟ and 2 - „off‟ periods for both 'Heating' and 'Hot Water'. This arrangement shall
       be capable of „either‟ or „both‟ services being provided dependant on the time settings
       entered

       When both heating and hot water loads are demanding the 3 way valve shall occupy the
       mid-position. When the domestic hot water load is satisfied the valve shall drive to close
       the „domestic‟ port and fully open the 'heating' port. With both loads satisfied the boiler
       shall be inhibited from 'short cycling' and the pump shall cease operation after heat
       dissipation has taken place from the boiler

8.12   Water Treatment

       The Contractor should allow for a suitable quantity of Scalemaster SM1 corrosion/scale
       inhibitor to be added to the systems. Two thirds of this amount should be emptied into the
       feed and expansion tank. The system should then be filled and circulated for 20 minutes to
       allow mixing. The remaining third should then be added to the feed and expansion tank.
       Note: See Item 8.15 - Flushing Out

8.13   Flushing Out

       Before being put into regular service each installation shall have a thorough hot and cold
       flush and be cleansed and the Contractor shall include for all necessary disconnections and
       reconnections of pipework etc. to enable this to be carried out.

       The Project Manager‟s representative will analyse a percentage of dwellings using a
       manufacturer‟s approved test kit in the presence of the Contractor‟s Supervising Officer

8.14   Frost Damage

       The Contractor shall take precautions against damage to any of the plant, pipework or
       equipment due to frost and in the event of such damage occurring during hydraulic testing
       or otherwise, the Contractor will be required to make good all such damage at his own
       expense




HSG 3657C                                     A/15
8.00   Works to All Dwellings (Cont‟d)

8.15   Testing and Commissioning

       The Contractor will be required to carry out the following works:-

       (a) Permanently set all lockshield valves and regulators on the heating installation, so as to
           give an even distribution of heat throughout the dwelling when all wheel top valves are
           fully open and the boiler flow temperature is 82°C (or to give an even distribution of
           circulation as applicable)

       (b) Carry out a full temperature test of each system. Random checks will be carried out by
           the Project Manager‟s representative

       (c) Arrange for the instruction of the tenant in the correct operation of all items of plant

       (d) In properties where a gas appliance is fitted, on completion of works, a gas drop test
           shall be carried out on every dwelling and readings duly noted on the Safety Certificate.
           The Contractor shall sign the Safety Certificate on completion of satisfactory test and
           submit it to the Project Manager

       Test and Completion Certificate

       Test Certificate

       Following the testing and inspection of the electrical works in accordance with Part 7 of the
       I.E.E. Wiring Regulations, 16th Edition, one copy of the N.I.C.E.I.C. Electrical Completion
       and Inspection Certificate shall be returned to the Project Manager

       The results of all tests shall be recorded stating the highest finite reading. Statements such
       as „greater than‟ or „infinity‟ will not be accepted




HSG 3657C                                     A/16
8.00   Works to All Dwellings (Cont‟d)

8.16   Electrical Works

       All interconnecting electrical wiring between the mains electricity supply, boiler, pump and
       various controls shall be carried out as part of this Contract

       System of Wiring

       All wiring shall be carried out in the fully concealed or sunk system using PVC insulated
       and sheathed cables with copper conductors, manufactured to the latest British Standard
       Specification, to the metric standard of 600/1000 volt grade with earth continuity conductor,
       and be Basec approved. These cables shall run within the ceiling/floor space and vertically
       in walls. Horizontally routed cables within walls are not permissible

       In the latter case the cables shall be recessed within chases in walls and covered in high
       impact PVC oval conduit and propriety fixings before being plastered over, all cables shall
       be fully protected below the conduit. The chasing shall be of sufficient depth to permit a
       minimum covering of 4 mm, of plaster. In roof voids, cables shall be fixed at the side of the
       wood joists and protected where they are taken across the tops of joists by enclosure in PVC
       mini-trunking. When wiring is run under floors, the joists shall be drilled so that the cables
       are at least 50 mm below the top of the joist, otherwise the cables shall be enclosed in High
       Impact PVC conduit particularly when laid in existing slots, PVC saddles and strip saddles
       shall be used for fixing the PVC cables which run alongside timber joists

       All equipment and accessories shall be fixed horizontally and where accessories are
       mounted locally they shall be in line either horizontally or vertically

       Cables shall be routed to follow the natural contours of the building, either parallel along
       joists or at right angles to joists and vertically fixed when routed down walls. Diagonal
       routes will not be accepted

       Cables routed in accessible ceiling voids must be securely fixed and saddled

       The Contractor shall wherever possible endeavour to conceal the cables within the fabric of
       the building in such a manner that the damage to the fabric is kept to a minimum. Full use
       shall be made of any existing conduits in which the new circuits can be satisfactorily
       accommodated. Cables shall not be routed within cavities

       Wherever new circuits are routed within existing metallic conduits, these isolated lengths of
       conduit shall be cross bonded to the main earthing terminal within the dwelling or to the
       earthing terminal in the local accessory. All conduits shall be cleaned, free from burrs and
       new bushes fitted before the insertion of any new circuits. Care shall also be taken to
       ensure that the I.E.E. Regulations concerning "space factor" is adhered to when reusing
       existing conduits

       No cable joints whatsoever will be permitted within the system of wiring. Junction or joint
       boxes shall not form any part of the installations. All cable terminations shall be made on
       the “loop in system” as accessory points




HSG 3657C                                     A/17
8.00   Works to All Dwellings (Cont‟d)

8.16   Electrical Works (Cont‟d)

       System of Wiring (Cont‟d)

       Care shall be taken when removing and replacing floorboards. Any floorboards damaged
       during the work shall be replaced by the Contractor with new timbers. All floorboards
       which are disturbed during the progress of the works shall be securely screwed back into
       their original position

       Where any cable passes through any wall or brickwork the cables must be enclosed in high
       impact PVC conduit. Where any metallic conduit is used this shall have a separate 4 mm²
       bonding conduit connected to the conduit and the distribution board

       The only areas where cables mounted on the surface of the building fabric will be allowed is
       in such instances as inside immersion heater cylinder cupboards, unplastered walls, or
       between the Consumer Unit and the ceiling void where the Consumer Unit is installed in a
       storeroom outside the normal living circulation area of the dwelling. However, in all these
       instances the cables shall still be enclosed within a system of insulated PVC cable trunking.
       The accessories in these areas shall be the flush type mounted in insulated surface type
       boxes

       No cables shall be routed behind any fireplace

       No circuit cables shall be routed within 150 mm of any water pipes. Routing cables within
       boxed in pipework routes will not be permitted. If any instances arise where it is impossible
       to distance cables from water pipes, i.e. where pipes and cables may cross at right angles
       under floorboards. The pipes shall be locally insulated in Thermal Insulation which shall be
       permanently secured with Nil-flam adhesive for a distance of 300 mm either side of the
       position where the cables and the pipes are unavoidably routed together

       No circuit cable shall be routed through a switch or socket outlet box neither shall these
       cables be routed within 300 mm of an accessory box

       Under no circumstances will any cabling in contact with the boiler be permitted within the
       boiler recess. The boiler supply cable shall be routed and secured as specified in the
       manufacturer‟s installation instructions




HSG 3657C                                     A/18
8.00   Works to All Dwellings (Cont‟d)

8.16   Electrical Works (Cont‟d)

       Polyvinyl Chloride (PVC) Insulated PVC Sheathed Cables

       These cables shall be PVC insulated and sheathed 250 volt copper conductors, in
       accordance with BSS 6004 and Basec approved, and shall be of one manufacture only
       throughout the contract. Cables shall be coloured in accordance with the 16th Edition of the
       I.E.E. Regulations. Non red coloured conductor shall not be used as switch wires. The
       wiring system shall be installed on the loop-in system without any joints, all connections
       shall be made at switch positions, socket outlets, etc.

       The PVC shall be suitable for resisting attack by oils, solvents, acids, and alkalis. It should
       not readily ignite and shall cease to burn when the source of ignition is removed

       Where PVC insulated PVC sheathed cables enter an accessory box, the box edges shall be
       suitably grommetted and all sharp burrs shall be removed, the sheath of all cables shall enter
       the accessory box

       In all positions liable to mechanical damage, e.g. cables routed above joists, cables shall be
       protected in high impact PVC conduit or trunking, which shall, where necessary, be bonded
       to the installation's main earthing terminal

       All cables shall be dressed flat and free from kinks and twists and shall be run in line with
       joists or at 90° to the same

       PVC insulated and PVC sheathed cables shall not be installed where the normal ambient
       temperature is expected to exceed 30°C. This shall be deemed to include lighting fittings,
       motor terminations, etc.

       The Contractor must ascertain that the individual cables they select have individual Basec
       approval

       Earthing

       The whole of the metallic portion of the dwelling (e.g. structure, pipework, fittings, etc.)
       and the electrical installation, other than the current carrying parts shall be electrically and
       mechanically bonded to the installation's main earthing terminal in accordance with the 16th
       Edition of the I.E.E. Wiring Regulations and as detailed below




HSG 3657C                                     A/19
8.00   Works to All Dwellings (Cont‟d)

8.16   Electrical Works (Cont‟d)

       Earth Clips and Earth Terminations

       The termination of all earthing leads and earth bonding cables to pipework, conduits,
       armoured cables shall be made using Tenby Earthing Clamps Cat No. EC15/16 complying
       with BS 951. The earth clamps shall be fixed to encircle a 50 mm section of the equipment
       to be earthed which shall be cleaned and made smooth using a file and emery cloth. The
       earthing lead shall be fixed to the clamp by a crimped ring terminal using washers and a
       spin and lock nut. A metal sign stating "Safety Electrical Connection - Do Not Remove"
       shall be attached to each clamp in accordance with Clause 514 - 13 of the I.E.E. Wiring
       Regulations 16th Edition. All connections of earth leads to earth clips shall be via circular
       crimped lugs

       Whenever flat sheets of metal have to be earthed, such as sinks, baths, or metal kitchen
       furniture, which do not possess an earthing tag, the apparatus shall be drilled to have a 5
       mm minimum diameter hole through which shall be inserted a 5 mm brass round head bolt
       which shall have a washer immediately below the head and a spring and normal washer to
       hold the earthing lead on the underside of the appliance. The screw shall be securely held
       by a spin and lock nut. The earthing lead shall be attached to the earth screw via a crimped
       ring terminal

       Earth Leads

       Main Earth Lead. This main conductor between the earthing bar in the consumer unit and
       the main earthing point shall be 16 sq. mm copper green/yellow PVC insulated cable

       All main Equipotential Bonding Leads - shall be 10 mm² copper green/yellow PVC
       insulated cable, local equipotential or supplementary bonding leads shall all be 4 sq. mm
       copper green/yellow PVC insulated cable

       Gas Service

       The gas service pipe on the consumer side of the gas meter shall be earthed via main
       equipotential bond

       A 50 mm section of the pipe which leaves the gas meter shall be cleaned and made smooth
       using a file and emery cloth. An earthing clamp as Tenby Earthing Clamp Cat Nos.
       EC16/15 complying with BS 951 shall be fixed to encircle the cleaned section of each pipe

       A 10 mm² copper green/yellow PVC insulated bonding lead shall be supplied and installed
       between the earthing connector block local in the consumer unit to the earthing clamp on
       the consumer pipe of the gas meter

       At each earth clamp the bonding conductor shall possess a crimped ring connection




HSG 3657C                                    A/20
8.00   Works to All Dwellings (Cont‟d)

8.16   Electrical Works (Cont‟d)

       Water Services

       A 50 mm section of the water service pipe, at a position close to the entry into the building,
       shall be cleaned and made smooth using a file and steel wool. An earthing clamp as Tenby
       Earthing Clamp EC15/16 complying with BS 951 shall be fixed to encircle the cleaned part
       of the pipe

       A 10 mm² copper green/yellow PVC insulated bonding lead shall be supplied and installed
       between the earthing connector block in the consumer unit and the earth clamp on the water
       service pipe

       At the earth clamp the bonding conductor shall possess a crimped ring connector

       Hot Water Cylinders

       All pipes passing, or connected to the hot water cylinder shall be cross bonded in 4 mm²
       copper green/yellow PVC insulated earth bonding cable, all pipe connections being made in
       BS 951 earthing clamps as Tenby EC15/16

       Cold water feed pipe to expansion tank
       Cold feed to cylinder
       Ventilation pipe cylinder
       2 Nr. gravity heating circulation pipes to cylinder

       Where the cold feed pipe does not run adjacent to the cylinder, a bonding lead shall be taken
       and connected to the nearest cold water feed pipe in the roof or interfloor space

       Bathrooms

       All metalwork in bathrooms which shall include: bath, pipework, shower unit, shower rail
       and screen, radiators, handrails, towel rails, radiant fires shall be cross bonded via
       equipotential cross bonding leads in 4 mm² copper green/yellow PVC insulated cable. This
       shall be taken on a looped radial principal to each of the following items in the bathroom
       areas:

       Hot and cold water pipe below bath
       Bath and waste pipe (where metal)
       Hot and cold water and waste (where metal) pipes serving wash hand basin
       Shower hot and cold water supply pipes, metal waste pipes, radiators
       Towel rail, handrail, shower screen (all where of metallic construction)




HSG 3657C                                     A/21
8.00   Works to All Dwellings (Cont‟d)

8.16   Electrical Works (Cont‟d)

       Where a bath or central heating radiator does not possess an earthing tag a 5 mm (¼") hole
       shall be drilled through the leg bracket casting of the bath or radiator through which shall
       pass a brass bolt having two washers, a spring washer, spin nut and lock nut. Bath panels
       shall be removed and refixed with care. Any damaged bath panels shall be replaced by the
       Contractor at his own expense. In any instances where bath panels cannot be removed
       without item being damaged this situation shall be brought to the attention of the Project
       Manager before the work commences. All connections to pipework shall be via earth
       clamps to BS 951

       Central Heating Pump

       A 50 mm section of the heating pipes at each side of the central heating pump shall be
       cleaned and made smooth as described previously. An earthing clamp as Tenby EC15/16
       complying with BS 951 shall be fixed to encircle the cleaned parts of the pipes

       A 10 mm² copper green/yellow PVC insulated bonding lead shall be installed between the
       2 Nr. earthing clamps at the central heating pump the 10 mm² bonding lead shall then be
       taken to and connected in the main earthing terminal in the consumer unit or earth connector
       Block

       At each earth clamp the bonding conductor shall possess a crimped ring connection

       Power Supply to Heating Systems

       Dwellings which have an existing re-wireable consumer unit, shall have the consumer unit
       replaced with an insulated MCB Consumer Unit complete with integral Residual Current
       Operated Circuit Breakers and insulated back. The Consumer Unit shall be situated such
       that the meter tails are kept as short as conveniently possible

       1.   The temporary connection between the new and the existing meter tails shall occur with
            the main cut out fuse removed. The Contractor shall install a double pole Henly
            connection box for connection between old and new meter tails. The Henly box shall
            be securely fixed and have sufficient new tails for a final connection by the Electricity
            Board into the meter

       2.   The Contractor must ensure that a connection notice for each dwelling is delivered to
            the Regional Electricity Company at the latest on the day the installation is handed over
            to the tenant

       3.   No approval will be given by the Regional Electricity Company to break the meter
            seals or to make any electrical connections into the meter

       The Consumer Unit shall have a split busbar system. One busbar will be fed via a
       100A mA time delayed RCD and the other busbar via a 30 mA RCD




HSG 3657C                                     A/22
8.00   Works to All Dwellings (Cont‟d)

8.16   Electrical Works (Cont‟d)

       Power Supply to Heating Systems (Cont‟d)

       The Consumer Unit shall possess the following MCB outgoing ways:

       Fed from the 100 mA RCD:

       1 - 6 amp lighting circuit - Ground floor and staircase
       1 - 6 amp lighting circuit - First floor
       1 - 6 amp spare

       Fed from the 30 mA RCD:

       1 - 32 amp ring final circuit (13 amp switch socket outlets) - Ground floor
           and First floor (2 or 3 BEDROOM DWELLINGS ONLY)
       1 - 16 amp radial circuit focal point fire    - Lounge
       1 - 10 amp radial circuit fan heater          - Bathroom
       1 - 32 amp cooker circuit
       1 - 16 amp immersion heater circuit
       1 - 6 amp central heating controls circuit
       Blank plates as required
       TYPE 2 MCB's shall be used

       All consumer units shall be clearly labelled as to their purpose. Within the insulated fuse
       cover plate the Contractor shall supply and install a TYPEWRITTEN circuit chart which
       shall be enclosed within a clear plastic holder suitably glued to the inside of the cover plate.
       This chart shall indicate the MCB ways, rating of MCB's, circuits controlled and size of
       circuit cable

       Rough, handwritten circuit charts will not be acceptable

       Where an RCD has been fitted in the meter tails or in the consumer unit, this shall be
       brought to the attention of the Electrical Inspector before commencement of any work

       The tenant shall be provided with full operating instructions for the MCB/RCCD Consumer
       Unit and shall be made fully aware as to its function

       All the existing circuits shall be reconnected into the new consumer unit and a circuit chart
       shall be fitted to clearly identify the circuits being controlled




HSG 3657C                                     A/23
8.00   Works to All Dwellings (Cont‟d)

8.16   Electrical Works (Cont‟d)

       Meter Tails

       The existing meter tails are to be renewed using 25 mm² PVC/PVC copper cable and the
       main earth bonding lead to 16 mm² green/yellow PVC copper cable

       The circuit for the heating system shall be wired in 1.0 sq mm PVC/PVC TE

       The consumer unit to be supplied and fitted by the Electrical Contractor shall be of the type
       and manufacture listed in the Schedule of Materials

       Controls for Gas Fired Boilers

       The installation shall consist of a radial circuit from the consumer unit to a fused isolating
       switch having a pilot light situated in the cylinder cupboard local to the valve, pump etc.,
       fused at 3 amps. The isolating switch to be engraved „Heating Isolator‟. From this isolator
       a supply shall be taken to a Double Pole Isolator having a pilot light situated in the Lounge
       local to the programmer, this shall also be engraved „Heating Isolator‟ and be fused at
       3 amps. Supplies from the isolator in the Lounge shall then be taken to the programmer in
       the Lounge and the wiring centre in the cylinder cupboard. The programmer to be supplied
       and fixed in the Lounge is to be a Randall Set 3E. Adjacent the isolating switch in the
       cylinder cupboard is to be mounted a Honeywell wiring centre, from which supplies to the
       valve, thermostats and pump will be taken. The final connections to the cylinder
       thermostat, pump and boiler shall be in heat resistant temperature Butyl 3 or 4 core flex,
       with the final connection to the pump via a 5 amp socket outlet and plughead and the final
       connection to the boiler via a Double Pole Isolator or a Triple Pole Isolator for fires with
       lights on, both these isolators are to be engraved „Boiler Isolator‟. A room thermostat is to
       be supplied and installed and wired into the wiring centre in the cylinder cupboard, final
       position of room stat is to be agreed on site. This would preferably be hallway sited away
       from radiator

       Flexes are not to be used for fixed wiring




HSG 3657C                                     A/24
8.00   Works to All Dwellings (Cont‟d)

8.16   Electrical Works (Cont‟d)

                                   SCHEDULE OF MATERIALS


       Consumer Units                           GE. VCBD4A6DIN
                                                MEM Delta AP 37 HEMET/BC
                                                Wylex NSSTM6306
       Consumer Units                  )        Wylex NDRM2004
       Electric C/H Only               )        MEM AP8ME

       Solid Fuel System               )
       Switched Fused Spur             )
       Cord Outlet                     )
       Dual Accessory Box              )
       20 Amp D/P/S with Neon          )
        5 Amp Socket                   )
                                       )        MEM Delta
       Gas Fire Boilers                )        Volex
       Fused Isolating Switch          )        Tenby
         with Neon                     )        Ashley
       20 Amp D/P S/W for Boiler       )
       3 Pole Isolator for Boiler      )
       5 Amp Socket                    )
       Randall SET 3E Timeclock        )

       Electric C/H Controls
       Double Pole Switch
       Unswitched Fused Spur
       Switched Fused Spur with Neon
       Randall ET009 7 Day
        Time Controller

       Contractor may select from any of the above manufacturers. Once selected that particular
       manufacturer must be used throughout the length of the contract period

       Note: All electrical works must be completed no later than the day following the
       completion of the heating installation. Temporary connections will only be accepted in
       emergency situations and with the permission of the Project Manager




HSG 3657C                                   A/25
9.00   Works to Some Dwellings (As Identified From Surveys)

9.01   Remove all other existing fires and appliances. Openings are to be built up in brickwork
       and plastered in 2 coat plaster to new areas of brickwork and existing where disturbed and
       finish smooth with existing wall finish; provide and fix timber skirtings to match existing
       fixed with sheradized screws and plastic plugs. Skirtings on chimney breast to be in one
       full length

9.02   All redundant chimneys are to be terminated by a mushroom cowl fitted into existing pot

9.03   Damaged chimney pots are to be replaced with new pots to match existing

9.04   Where asbestos bath panels are encountered these are to be replaced with a suitable
       hardboard panel. The asbestos panel shall be removed, bagged and disposed of at a suitable
       site in accordance with the Control of Asbestos at Work (Amendment) Regulations 1992
       and the Approved Code of Practice entitled “The Control of Asbestos at Work (Second
       Edition)”

9.05   Provide and fix one row of slatted shelving to cylinder cupboard where an Elson tank has
       been removed

9.06   Where the existing hatch and frame is too small to accommodate the new tank, enlarge
       opening and provide and fit new access hatch and frame suitably sized

9.07   Where a chimney stack has been terminated in the roof space the Contractor is to allow for
       opening up the existing flue within the existing roof space, and providing and fixing new
       proprietary twin wall flue system sealed to existing flue to be „B‟ Vent Universal as
       manufactured by Rite Vent Ltd., to BS 715 1989, manufactured under the requirement of
       BS 5750 Quality Assurance. Include terminating above roof complete with all necessary
       fixings and fittings and all necessary flashings; making good all disturbed work (Gas
       Installations)

9.08   Where gas fired independent fires are to be fitted, the Contractor shall provide and fix a
       non-combustible hearth where required as stated in the manufacturer‟s recommendations.
       All hearths to be conglomerate marble




HSG 3657C                                    A/26
9.00   Works to Some Dwellings (As Identified From Surveys) (Cont‟d)

9.09   Cold Water Storage Tank

       Where the existing cold water storage tank is found to be defective or galvanised steel,
       provide and install on a separate close boarded base 1 Nr. 136 litre actual capacity (or other,
       if so specified) insulated tank to the same specification as given above

       Each cistern shall incorporate:

       (i)     Close fitting insulated lid
       (ii)    15 mm ballvalve and ball
       (iii)   22 mm copper overflow pipe to outside
       (iv)    22 mm cold feed connection off side of tank for cylinder
       (v)     15 mm isolation valve on cold feed
       (vi)    Byelaw 30 Ferham RK Tank Kit

9.10   Immersion Heaters - Where and When Fitted

       A 3 KW immersion heater is to be positioned in the hot water cylinder; with in-built
       thermostat (provided existing cylinder fitted with immersion)

       Wiring to this unit shall be from an adjacent point




HSG 3657C                                     A/27
              APPENDIX B

        ELECTRICAL INSTALLATION
             SPECIFICIATION




HSG 3657C
                                         INDEX
Item            Description                                                           Page No.
1.01            Introduction                                                           B/2
1.02            Scope of Work                                                          B/2
1.03            Class of Works                                                         B/3
1.04            Safety of Site Works                                                   B/3 - B/5
1.05            Materials                                                              B/5
1.06            Specified Equipment to be Supplied and Installed by Contractor         B/5
1.07            Earthing                                                               B/5 - B/9
1.08            Inspection and Testing                                                 B/10 - B/11
1.09            Test Certificate                                                       B/11
1.10            Programme of Works                                                     B/12
1.11            Phasing of the Works when it is intended that tenants remain in
                occupation whilst the works are carried out                            B/12
1.12            Access to Dwellings                                                    B/12
1.13            Existing Obsolete Electrical Services within the Dwellings             B/12
1.14            Tenants‟ Own Additional Electrical Works                               B/13
1.15            Electricity Supply                                                     B/13
1.16            Connection of Meter Tails                                              B/13 - B/14
1.17            Consumer Unit                                                          B/14 - B/15
1.18            System of Wiring                                                       B/15 - B/16
1.19            PVC Insulated PVC Sheathed Cables                                      B/16
1.20            Meter Tails                                                            B/17
1.21            Cables for Lighting and Power Circuits                                 B/17
1.22            Flexible Cords and Cables                                              B/17
1.23            Builders Work                                                          B/17 - B/18
1.24            Supplying, Fixing and Connection                                       B/18
1.25            Accessory Boxes/Rubber Grommets                                        B/19
1.26            Mounting Heights                                                       B/20
1.27            Lighting Installation                                                  B/21 - B/22
1.28            General Purpose Power Points                                           B/22
1.29            Cooker Circuits                                                        B/23
1.30            Immersion Heater Installation                                          B/23
1.31            Smoke Detectors                                                        B/24
1.32            Accessories                                                            B/24
1.33            Appendices enclosed with Standard Technical Performance Spec.          B/24
1.34            Replacement of new Electrical Services Supplied by Tenant              B/24
1.35            Setting Out of Electrical Works                                        B/25
1.36            Architraves                                                            B/25
1.37            Fixing of recessed equipment Within plasterboard/timber studding walls B/25
1.38            Plant and Equipment                                                    B/25
1.39            Aged Persons Dwellings - Special Requirements                          B/25
1.40            Dust Sheets/Removal of Dust                                            B/25
1.41            Plastering                                                             B/26
1.42            Incomplete or Unsatisfactory Work                                      B/26
1.43            Contractor‟s Supervision of the Works                                  B/26
1.44            Shower Circuit                                                         B/26
1.45            Fans                                                                   B/26
1.46            Flats with Concrete Ceilings                                           B/27
1.47            Central Heating Wiring                                                 B27 - B/31
Appendix No.1   Specified Equipment                                                    AP.A.1/1-3



HSG 3657C                                   B/1
GENERAL TECHNICAL INSTALLATION SPECIFICATION

ELECTRICAL REWIRE OF EXISTING IMPROVED COUNCIL DOMESTIC
DWELLINGS

1.01   Introduction
       The Clauses in this Specification comprise the Architect's Standard Clauses detailing the
       method, and minimum standard of installation procedure to be adopted. All items which are
       relevant to this scheme must be strictly adhered to, and permission to deviate from any of
       these relevant Clauses must be obtained in writing from the Architect prior to commencing
       the work

       This specification shall be read in conjunction with each house type drawing or schedule
       which details the layout of each individual electrical installation and any addendum
       information which is included within the Tender documents

       All drawings or schedules provided form part of this specification and all equipment
       indicated on either the drawings or specification shall be deemed to be indicated on both

       This specification has been written in the terms of "The Contractor". This term shall be
       deemed to describe the electrical services installer or electrical contractor

1.02   Scope of Work
       The Contractor is responsible for supplying, erecting, installing, testing, commissioning and
       co-ordinating all work in this Contract which comprises the following items:

       (1)   Main Switchgear/Consumer Unit and associated connections into the Regional
             Electricity Company metering equipment
       (2)   General lighting installation within the dwellings including all associated items such as
             switches, circuit cables, lampholders
       (3)   Switch socket outlet installation within the dwellings including all associated items such
             as accessories
       (4)   Cooker Circuit
       (5)   Immersion Heater Installation
       (6)   Builders Work
       (7)   Removal of rubbish and redundant materials
       (8)   Inspecting and Testing the installation
       (9)   Liaison with tenants
       (10) Liaison with the Regional Electricity Company regarding access into the energy meter
            and finally testing the completed works
       (11) Smoke Detectors
       (12) Fans
       (13) Showers
       (14) Central Heating




HSG 3657C                                        B/2
1.03   Class of Works
       (a) All work shall be executed in the manner set out in this Specification

       (b)   All work shall be performed by skilled workmen under the supervision of the on site
             Supervisor during the whole execution of the contract. The Architect or his
             representative shall be at liberty to ask that any person employed by the Contractor in
             the execution of the works who shall misconduct himself or shall in his opinion be
             incompetent or negligent in the performance of his duties be withdrawn and such person
             not be employed again in any portion of the works

       (c)   The whole of the work shall be carried out in strict accordance with the 16th Edition of
             the Regulations for the Electrical Installations and any amendments as issued by the
             Institution of Electrical Engineers (hereinafter referred to as the I.E.E. Wiring
             Regulations), the Electricity (Factories Act) Special Regulations 1908 and 1944, the
             Electricity Supply Regulations 1937 and 1988, and the Electricity at Work Regulations,
             1989

       (d)   The Contractor is reminded that most dwellings having electrical work will be fully
             occupied during the currency of the works. The Architect will demand that the
             Contractor is courteous to tenants and makes every endeavour possible to ensure that
             the work is undertaken in a safe manner which causes the absolute minimum of
             inconvenience to the householder, with particular regard to cleanliness and damage to
             any decorations or fitments within the premises

       (e)   The Electrical Contractor must be a member of the National Inspection Council for
             Electrical Installation Contracting and/or a member of the Electrical Contractors
             Association

1.04   Safety of Site Works
       The Contractor shall ensure that the work undertaken in each dwelling is carried out in a safe
       manner with regard to his own staff, and the occupants of the dwellings who will be in
       residence throughout the execution of the works, in accordance with the following
       requirements:

       (1)   All works shall be undertaken in accordance with the Electricity at Work Regulations
             (1989), the Health and Safety at Work Act 1974 and all obligations under the Act and
             other regulations governing building sites including the provisions of the Factories Act
             1961 and Construction Regulations

       (2)   All staff employed on the site must have previously been adequately trained to execute
             the works in a safe manner and must be able to maintain a safe working practice at all
             times

       (3)   All staff must be able to operate tools and plant especially those operated by electricity
             in a safe manner

       (4)   All stocking, placing and storing of materials or furniture shall be done effectively to
             ensure maximum safety and minimum danger. Materials must not be stored in any
             access or exit areas used by the householder, especially fire escape routes




HSG 3657C                                        B/3
         (5)    All materials and plant, especially hand tools and flexible electricity supply cables, shall
                be maintained in a good and safe condition. Any damaged or faulty equipment shall be
                immediately repaired or replaced

         (6)    The site works shall be maintained in a tidy manner. All rubbish shall be immediately
                removed from the site

         (7)    The Contractor's staff shall be provided with all necessary protective clothing, eye
                protectors, etc.

         (8)    No improvisation to the works will be allowed

         (9)    All electrical works shall be undertaken in strict accordance with the 16th Edition of the
                I.E.E. Wiring Regulations. All electrical services shall be kept in a safe condition

         (10) (a)     In occupied premises the Contractor shall, before the commencement of the
                      works, explain to the tenant the extent of the installation, giving particular
                      attention to areas of potential danger which will not readily be accessible to the
                      householder without being accompanied by the Contractor

                (b)   Floorboards shall only be removed in areas where work is proceeding. Any
                      floorboards removed in areas where work is not being undertaken shall either
                      temporarily or permanently be replaced

                (c)   In all areas where floorboards are being removed the Contractor shall display a
                      traffolyte sign having 25 mm high red letters on a white background stating -
                                                 DANGER DO NOT ENTER
                      In any instances where floor traps exceeding 300 mm in width are removed for
                      access purposes, these specific areas shall in addition be roped off

                (d)   If through urgent circumstances the householder wishes to gain access into any
                      working areas, any removed floor covers shall be replaced prior to access being
                      permitted

         (11) All excavations must be kept in a safe condition, possessing adequate safety barriers
              and warnings

         (12) Apprentices shall only work under the direct supervision of a qualified tradesman

         (13) All power tools shall be double insulated and shall operate at a maximum of 110 volts
              fed via a centre tapped transformer using only purpose made high impact toughened
              flexible cable

         (14) All extension leads plus leads to equipment must be continuous throughout their entire
              lengths, no joints will be permitted, and leads must be fitted with appropriate plugs and
              sockets. Where extension leads or leads to equipment is energised at the supply
              voltage, the leads shall be protected by a B. and R. plughead, or other approved
              plughead incorporating an R.C.D. rated at a maximum of 30 mA

  (15)         „Hilti‟ impact guns or similar may only be used with the written authorisation of
               the Architect



HSG 3657C                                            B/4
       (16) Nails must be removed when floorboards are first taken up to avoid any dangers of nails
            piercing footwear

       (17) The Contractor must provide his own steps and ladders

       (18) Live terminals on any apparatus must never be left in an exposed condition

       (19) Upon completion of the works the electrical services must be tested in accordance with
            the 16th Edition of the I.E.E. Wiring Regulations and may be witnessed by the
            Electrical Inspector

       (20) All tenant‟s electrical fixtures, such as lighting fittings which are directly connected to
            the wiring system must be tested to ensure their safety in accordance with the 16th
            Edition of the I.E.E. Wiring Regulations before they are re-connected

       (21) Tools must not be left lying about where they may be inadvertently picked up by
            children

1.05   Materials
       All materials shall be in accordance with the types and manufacture described in this
       Specification and as shown on the drawings. Where materials differing from those described
       are preferred to be used, approval shall be obtained from the Architect in writing

       All materials shall fully comply with the appropriate British Standard Specification

       The Architect reserves the right to inspect materials on site at reasonable times and to reject
       any materials not complying with the Specification and to the dismantling and re-erection of
       the installation where occasioned by the removal of rejected materials

1.06   Specified Equipment to be Supplied and Installed by Contractor
       Appendix No. 1 enclosed with the Specification lists all materials and accessories which the
       Contractor shall supply to undertake the works. In certain instances the Contractor is given a
       choice of manufacturers. However, only one manufacturer for each specific type of
       equipment will be allowed throughout the Contract. No mixing or interchanging of
       equipment will be allowed

1.07   Earthing
       The whole of the metallic portion of the dwelling (e.g. structure, pipework, fittings, etc.) and
       the electrical installation, other than current carrying parts, shall be electrically and
       mechanically bonded to the installation's main earthing terminal in accordance with the 16th
       Edition of the I.E.E. Wiring Regulations and as detailed below

       (a)   Earth Clips and Earth Terminations
             The termination of all earthing leads and earth bonding cables to pipework, conduits,
             armoured cables shall be made using Tenby Earthing Clamps Cat. No. EC15-16
             complying with BS 951. The earth clamps shall be fixed to encircle a 50 mm section of
             the equipment to be earthed which shall be cleaned and made smooth using a file and
             emery cloth. The earthing lead shall be fixed to the clamp by a crimped ring terminal
             using washers and a spin and lock nut. A metal sign stating 'Safety Electrical
             Connection - Do Not Remove' shall be attached to each clamp in accordance with
             Clause 514-13 of the I.E.E. Wiring Regulations 16th Edition



HSG 3657C                                         B/5
            All connections of earth leads to earth clips shall be via. circular crimped lugs

            Whenever flat sheets of metal have to be earthed, such as sinks, baths, or metal kitchen
            furniture, which do not possess an earthing tag, the apparatus shall be drilled to have a
            5 mm minimum diameter hole through which shall be inserted a 5 mm brass round head
            screw which shall have a washer immediately below the head and a spring and normal
            washer to hold the earthing lead on the underside of the appliance. The screw shall be
            securely held by a spin and lock nut. The earthing lead shall be attached to the earth
            screw via. a crimped ring terminal

     (b)    Earth Leads
            Main Earth Lead. This main conductor between the earthing bar in the consumer unit
            and the main earthing point shall be 16 mm² copper green/yellow PVC insulated cable

            All main Equipotential Bonding Leads shall be 10 mm² copper green/yellow PVC
            insulated cable. Local equipotential or supplementary bonding leads shall all be 4 mm²
            copper green/yellow PVC insulated cable

     (c)    Earthing Terminal
            The main earthing terminal within the dwelling will be provided by the Regional
            Electricity Company and shall take the form of either:-

     (i)    A TN-S System (previously known as SP&N with Boards Earth). The supply
            conductor cable sheath shall be used as the main earth terminal. With this system the
            main earthing lead shall terminate in a crimped lug arrangement and shall be securely
            fixed to a BS 951 earth clip fixed to the supply cable lead sheath or where this is not
            possible the earthing lead shall be attached to the supply cable earth clamp

     (ii)   A TN-C-S System (previously known as a P.M.E. System). With this type of earthing
            system the electricity supply authority will provide an earth terminal block immediately
            adjacent to their cut out. The Contractor must detail on his test certificate for each
            dwelling, to the Regional Electricity Company, that the electrical installation is required
            to be earthed via their earth terminal

            In order to prevent any delay between the electrical works being completed and the
            main earth lead being connected into the earth terminal, the Electrical Contractor shall
            inform the Regional Electrical Company prior to commencement of the works of the
            earthing requirements and either obtain permission to gain access into the earthing point
            or ensure that the Regional Electricity Company‟s representative is available on site to
            affect any connections before the electrical works are handed over to the householder

            If the Contractor has any difficulties in obtaining suitable earthing facilities in any
            dwelling he should immediately contact the respective Regional Electricity Company
            and inform the Architect before the electrical installation within the dwelling is handed
            over to the tenant




HSG 3657C                                        B/6
            It is the Contractor‟s responsibility to ensure that the installation is properly earthed
            before it is energised. Where the installation relies upon the provision by the Regional
            Electricity Company of an earth facility and this has not been installed before the
            installation is required for use, the Contractor shall treat the earthing arrangements
            temporarily as TT and supply and install a suitable earth electrode accordingly. Failure
            to do so contravenes the Electricity Supply Regulations 1988 as amended and the
            Electricity at Work Regulations 1989

     (d)    Consumer Unit
            The earthing connection between the earthing terminal in the consumer unit and the
            dwelling's main earthing terminal shall be made in a 16 mm² copper green/yellow
            PVC insulated earthing conductor. If this lead has to be connected to screw, bolt or
            threaded stud type termination at the main earthing point, the earthing conductor shall
            be fixed to this terminal via a crimped annulus ring terminal

     (e)    Gas Service
            The gas service pipe on the consumers side of the gas meter shall be earthed via main
            equipotential bond

            A 50 mm section of the pipe which leaves the gas meter shall be cleaned and made
            smooth using a file and emery cloth. An earthing clamp as Tenby Earthing Clamp Cat.
            Nos. EC15-16 complying with BS 951 shall be fixed to encircle the cleaned section of
            the pipe

            A 10 mm² copper green/yellow PVC insulated bonding lead shall be supplied and
            installed between the earthing connector block in the consumer unit to the earthing
            clamp on the consumers pipe of the gas meter

            At each earth clamp the bonding conductor shall possess a crimped ring connection

     (f)    (i)    Water Services
                   A 50 mm section of the water service pipe, at a position close to the entry into the
                   building, shall be cleaned and made smooth using a file and steel wool. An
                   earthing clamp as Tenby Earthing Clamp EC15-16 complying with BS 951 shall
                   be fixed to encircle the cleaned part of the pipe

                   A 10 mm² copper green/yellow PVC insulated bonding lead shall be supplied and
                   installed between the earthing connector block in the consumer unit and the earth
                   clamp on the water service pipe

                   At the earth clamp the bonding conductor shall possess a crimped ring connection

            (ii)   Central Heating
                   A 50 mm section of the heating pipes at each side of the central heating pump
                   shall be cleaned and made smooth. An earthing clamp such as Tenby EC15-16
                   complying with BS 951 shall be fixed to encircle the cleaned parts of the pipes. A
                   10 mm² copper green/yellow PVC insulated bonding lead shall be installed
                   between the 2 Nr. earthing clamps at the central heating pump and the earthing
                   connector block in the consumer unit




HSG 3657C                                        B/7
     (g)    Structural Steelwork
            Dwellings with structural steel frames shall have the main steelwork connected via a
            10 mm² bonding lead to the main earth connector block.

     (h)    Kitchen Area
            All metal sinks or metal kitchen furniture within the kitchen area shall be crossbonded
            to the water pipes

            Below each sink position the pipes supplying the hot and cold taps and metal waste
            pipes shall be cleaned with a file and steel wool. An earthing clamp as Tenby Earthing
            Clamp Cat. Nos. EC16-15 complying with BS 951 shall be fixed to encircle the cleaned
            section of the pipes. These pipes shall then be crossbonded in a 4 mm² copper
            green/yellow PVC insulated bonding lead. Where the sink top is metal this shall also be
            crossbonded to the cold water pipe earth clamp. This shall be achieved by either
            connecting a 4 mm² copper green/yellow PVC insulated bonding lead between this
            earth clamp and the earthing tag on the sink top, or where this is not available the sink
            top shall be drilled with a 5 mm (¼”) diameter hole through which shall be inserted a
            brass bolt having a half round hemispherical head, complete with 2 washers, spring
            washer, spin nut and lock nut

            In instances where the sink top requires drilling, special care shall be taken to conceal
            the point where the earthing screw is positioned so that it is out of sight and not likely to
            be touched by anyone using the sink

     (i)    Bathrooms
            All bathrooms are to have supplementary earth bonding carried out in accordance with
            the 16th Edition I.E.E. Wiring Regulations, including Amendment 3, Section 6.01

           Where a bath or central heating radiator does not possess an earthing tag a 5 mm (¼")
           hole shall be drilled through the leg bracket casting of the bath or radiator through which
           shall pass a brass bolt having two washers, a spring washer, spin nut and a lock nut.
           Bath panels shall be removed and refixed with care. Any damaged bath panels shall be
           replaced by the Contractor at his own expense. In any instances where bath panels
           cannot be removed without them being damaged this situation shall be brought to the
           attention of the Architect before the work commences. All connections to pipework
           shall be via earth clamps to BS 951




HSG 3657C                                        B/8
     (j)    Hot Water Cylinders
            All pipes passing, or connected to the hot water cylinder shall be crossbonded in 4 mm²
            green/yellow PVC insulated earth bonding cable, all pipe connections being made in BS
            951 earthing clamps:

            Cold water feed pipe to expansion tank
            Cold feed to cylinder
            Ventilation pipe cylinder
            2 No. gravity heating circulation pipes to cylinder

            Where the cold water feed pipe does not run adjacent to the cylinder, a bonding lead
            shall be taken and connected to the nearest cold water feed pipe in the roof or interfloor
            space

     (k)    Installation of Earth Bonding Cables
            All earth bonding cables shall be installed in an identical manner to the remainder of the
            PVC/T&E/PVC wiring cables installed elsewhere within the dwelling. The earth leads
            shall be totally concealed within the fabric of the building either within floor/roof space
            areas or concealed behind PVC oval conduit within chases formed in the plasterwork of
            the premises

            In any instances where earthing leads have to be installed on the surface, they shall be
            enclosed in PVC minitrunking which shall be securely fixed with 32 mm No. 10 wood
            screws at 600 mm centres

            Wherever the cables have to be routed on the surface in such items as below sink
            positions, where not immediately looping between items to be earthed, they shall be
            enclosed in small section PVC minitrunking. Lengths of surface mounted earth
            bonding cables will not be allowed

            In addition the destination of these cables shall be identified via individually numbered
            ring cable markers at the consumer unit and at destination




HSG 3657C                                       B/9
1.08   Inspection and Testing
       During the progress and upon the completion of the installation, and prior to being energised,
       the works shall be thoroughly inspected and tested in strict accordance with Part 7 of the
       16th Edition of the I.E.E. Wiring Regulations

       Upon completion of the works and before final acceptance, the whole installation shall
       be subjected to the following tests and witnessed by the Electrical Inspector. Any
       defects shall be noted, corrected and brought to the notice of the Architect. The tests
       shall then be repeated either wholly or in part in the presence of the Architect

       The Contractor shall provide on site at all times the following instruments for the
       performance of the tests and shall be responsible for carrying out the tests: earth loop
       impedance tester, insulation and continuity tester, RCD tester

       The Contractor shall undertake all testing in the following sequence:

       (a)   Continuity of protective conductors and equipotential bonding
             The continuity of protective conductors including bonding conductors shall be verified
             in accordance with Regulation 713-02 of the 16th Edition of the I.E.E. Wiring
             Regulations

       (b)   Continuity of ring final circuit conductors
             A test shall be made to verify the continuity of each conductor including the protective
             conductor, of every ring final circuit in accordance with Regulation 713-03 of the
             16th Edition of the I.E.E. Wiring Regulations.

       (c)   Insulation Resistance
             The installation resistance between live conductors shall be measured, before the
             installation is connected to the supply. Tests shall be in accordance with Regulation
             713-04 of the 16th Edition of the I.E.E. Wiring Regulations

       (d)   Site applied insulation
             All site applied insulation shall be verified as capable of withstanding test voltage
             between 1000V to 1500V according to BS 5486. It shall be verified that insulated
             enclosures are protected to a minimum of IP2X and capable of withstanding test voltage
             of 1500V to 5200V according to BS 5486. Tests shall be in accordance with
             Regulation 713-05 of the 16th Edition of the I.E.E. Wiring Regulations

       (e)   Protection by separation of circuits
             Verify and test that live parts of circuits protected by SELV or electrical separation are
             electrically separate from live parts of other circuits and in accordance with Regulation
             713-06 of the 16th Edition of the I.E.E. Wiring Regulations




HSG 3657C                                        B/10
       (f)   Protection against direct contact, by a barrier or enclosure provided during
             erection
             Verify by test that enclosures or barriers have protection not less than IP2X or IP4X
             where required, in accordance with Regulation 713-07 of the 16th Edition of the I.E.E.
             Wiring Regulations

       (g)   Insulation of non-conducting floors and walls
             Tests shall be made in accordance with Regulation 713-08 of the 16th Edition of the
             I.E.E. Wiring Regulations

       (h)   Polarity
             A test shall be made to verify all fuses and single pole control devices are only
             connected in the phase conductor. Socket outlets and similar accessories shall be tested
             to ensure that wiring is correctly connected. Tests shall be in accordance with
             Regulation 713-09 of the 16th Edition of the I.E.E. Wiring Regulations

       (i)   Earth fault loop impedance
             The protective conductor shall be verified in accordance with Regulation 713-10 of the
             16th Edition of the I.E.E. Wiring Regulations

       (j)   Earth Electrode Resistance
             The resistance of earth electrodes shall be verified in accordance with Regulation
             713-11 of the 16th Edition of the I.E.E. Wiring Regulations

       (k)   Operation of residual current operated devices
             The effectiveness of the RCD shall be verified by a test simulating an appropriate fault
             condition and independent of any test facility incorporated in the device in accordance
             with Regulation 713-12 of the 16th Edition of the I.E.E. Wiring Regulations

       (l)   Inspection Notice
             A notice to the effect that the installation should be periodically inspected and tested
             shall be secured to the consumer unit. The notice shall comply with Regulation 514-12
             of the 16th Edition of the I.E.E. Wiring Regulations

             All necessary labour, apparatus and instruments necessary for carrying out all tests shall
             be provided by the Electrical Contractor

1.09   Test and Completion Certificate

       Test Certificate
       Following the testing and inspection of the electrical works in accordance with Part 7 of the
       I.E.E. Wiring Regulations, 16th edition, one copy of the N.I.C.E.I.C. Test Certificate shall be
       returned to the Architect as detailed in Clause 1.08

       The results of all tests shall be recorded stating the highest finite reading. Statements such as
       „greater than‟ or „infinity‟ will not be accepted




HSG 3657C                                        B/11
1.10   Programme of Works
       The successful tenderer will be required prior to the signing of the contract to produce a draft
       programme showing the sequence of the works and to submit it to the Architect for approval

       Draft programme forms are available from the Architect

       Site meetings will be held at suitable intervals during the currency of the site works. The
       meetings will normally be held at the offices of the local Housing Manager. The Contractor
       will be required to have a Senior Member of his staff in attendance at each of these meetings

       This programme of works will be used by the Housing Department to notify all tenants when
       their individual house is scheduled for rewiring

       Special care must be taken by the Contractor where tenants have arranged to be absent from
       their own means of employment in order to allow the Contractor access into their dwellings.
       The Contractor must ensure in these circumstances that the work is fully co-ordinated to
       meeting the reasonable demands of the tenant

       The Contractor shall assume that access to all dwellings will be available between 08.00
       hours and 17.00 hours Monday to Friday, excepting Public Holiday Periods

1.11   Phasing of the Works
       Where it is intended that tenants remain in occupation whilst the works are carried out, during
       the electrical work within individual dwellings, no tenant shall be left without suitable
       electricity supply either overnight or during a weekend period

       The Contractor shall include in his tender for carefully moving furniture, carpets, etc., as
       dictated by the works and subsequently replacing, refixing or relaying as required. The
       Contractor will be held responsible for making good any damage caused to tenants furniture,
       carpets, ornaments, etc., by his operators in complying with the above provisions

1.12   Access to Dwellings
       The Contractor shall give all individual tenants a minimum of five days‟ notification before
       any work is expected to commence in the householder‟s own premises. Where the
       Contractor experiences any difficulty in notifying tenants or gaining access into a dwelling,
       the Contractor shall immediately inform the CA of this situation and await further
       instructions

       The Contractor shall not force his presence/access upon any householder

1.13   Existing Obsolete Electrical Services Within the Dwellings
       All obsolete existing electrical equipment within each dwelling shall be removed from site by
       the Contractor on a daily basis. This includes such equipment as lighting and power
       accessories, cable, conduits, etc. Rubbish shall not be placed in the tenant‟s dustbin or
       garden

       Wherever the removal of this equipment results in holes being left within the fabric of the
       building, the Contractor shall ensure that all such holes are suitably plastered over on
       completion of the works within the dwelling




HSG 3657C                                        B/12
1.14   Tenants Own Additional Electrical Works
       Where the Contractor, during the currency of the works, finds any existing circuitry within
       the dwellings which he considers unsafe and requires reconnecting into the new system, these
       circumstances shall be brought to the attention of the Architect before any work affecting
       these items is undertaken

       Such items falling into this category include external lights, circuits to
       outbuildings/greenhouses or additional lighting, or central heating systems. The Contractor
       will be reimbursed for any additional work which is agreed by the Architect concerning the
       reuse of the tenants‟ own electrical fitments

       The Architect shall be informed of any requests made by tenants to extend the works outside
       the contractual requirements of the scheme

1.15   Electricity Supply
       The electricity supply to each individual dwelling is existing and consists of a 240 volt single
       phase and neutral, 50 Hertz, supply

       The Regional Electricity Company are required to make the final connections to any
       installations undertaken by the Contractor, the following procedure shall be adopted:-

       Regional Electricity Company
       The Contractor shall notify in writing the Architect and Regional Electricity Company when
       the electrical works are ready for connection to the mains supply, and shall enclose an
       appropriately completed copy of the Regional Electricity Company‟s Test Certificate on a
       weekly basis

       Failure to Connect Supply
       In any instances where the Regional Electricity Company refuses to connect the supply the
       Architect shall be immediately informed of this situation and shall instruct the Contractor in
       writing what further course of action shall be taken. Where the Regional Electricity
       Company refuses to connect an installation, any charges required by the Authority for
       subsequent tests shall be borne by the Contractor

1.16   Connection of Meter Tails
       1.  The Contractor has no approval to interfere with any of the Regional Electricity
           Company’s equipment without the express permission of the Company

       2.   The Electrical Contractor shall provide the Regional Electricity Company District
            Inspector and the Architect with a list of all the addresses he is planning to rewire
            together with the anticipated completion date for each dwelling

       3.   Following acceptance of this list, the Regional Electricity Company District Inspector
            should be requested to give the Electrical Contractor restricted approval, which shall
            affect these dwellings only, to remove the main cut out fuse in order to make temporary
            connections between the new and the existing meter tails




HSG 3657C                                        B/13
       4.    The temporary connection between the new and the existing meter tails shall occur with
             the main cut out fuse removed. The Contractor shall install a double pole Henly
             connection box for connection between old and new meter tails. The Henly box shall
             be securely fixed and have sufficient new tails for a final connection by the Electricity
             Board into the meter

       5.    The Contractor must ensure that a connection notice for each dwelling is delivered to
             the Regional Electricity Company at the latest on the day the installation is handed over
             to the tenant

       6.    No approval will be given by the Regional Electricity Company to break the meter seals
             or to make any electrical connections into the meter

1.17   Consumer Unit
       The Contractor shall supply and fix an insulated MCB Consumer Unit complete with integral
       Residual Current Operated Circuit Breakers and insulated back. The Consumer Unit shall be
       situated such that the meter tails are kept as short as conveniently possible

       The Consumer Unit shall have a split busbar system. One busbar will be fed via a 100A time
       delayed 100 mA RCD and the other busbar via a 100A 30mA RCD

       The Consumer Unit shall possess the following MCB outgoing ways:-

       Fed from the 100 mA RCD:

       1 - 6 amp lighting circuit - Ground floor and staircase

       1 - 6 amp lighting circuit - First floor

       1 - 6 amp smoke detector circuit

       Fed from the 30 mA RCD:

       1 - 32 amp ring final circuit (13 amp switch socket outlets) - Ground floor and first floor
            (2 OR 3 BEDROOM DWELLINGS ONLY)

       1 - 32 amp ring final circuit (13 amp switch socket outlets) - Ground floor
            (4 BEDROOM DWELLINGS ONLY)

       1 - 32 amp ring final circuit (13 amp switch socket outlets) - First floor
            (4 BEDROOM DWELLINGS ONLY)

       1 - 32 amp cooker circuit

       1 - 16 amp immersion heater circuit

       1 - 6 amp central heating controls circuit

       Blank plates as required

       Type „B‟ MCB‟s shall be used



HSG 3657C                                           B/14
       All consumer units shall be clearly labelled as to their purpose. Within the insulated fuse
       cover plate the Contractor shall supply and install a TYPEWRITTEN circuit chart which
       shall be enclosed within a clear plastic holder suitably glued to the inside of the cover plate.
       This chart shall indicate the MCB ways, rating of MCB‟s, circuits controlled and size of
       circuit cable

       Rough, handwritten circuit charts will not be accepted by the Architect

       Where an RCD has been fitted in the meter tails or in the consumer unit, this shall be brought
       to the attention of the Electrical Inspector before commencement of any work

       The tenant shall be provided with full operating instructions for the MCB/RCCD
       Consumer Unit and shall be made fully aware as to its function

1.18   System of Wiring
       All wiring shall be carried out in the fully concealed or sunk system using PVC insulated and
       sheathed cables with copper conductors, manufactured to the latest British Standard
       Specification, to the metric standard of 600/1000 volt grade with earth continuity conductor.
       These cables shall be run within the ceiling/floor space and vertically in walls. Horizontally
       routed cables within walls is not permissible. All cables shall have BASEC approval

       In the latter case the cables shall be recessed within chases in walls and covered by high
       impact PVC oval conduit and proprietary fixings before being plastered over, all cables shall
       be fully protected below the conduit. The chasing shall be of sufficient depth to permit a
       minimum covering of 4 mm of plaster. In roof voids, cables shall be fixed at the side of the
       wood joists and protected where they are taken across the tops of joists by enclosure in PVC
       mini-trunking. When wiring is run under floors, the joists shall be drilled so that the cables
       are at least 50 mm below the top of the joist, otherwise the cables shall be enclosed in High
       Impact PVC conduit, particularly when laid in existing slots, PVC saddles, and strip saddles
       shall be used for fixing the PVC cables which run alongside timber joists. Under no
       circumstances are artexed walls to be chased

       All equipment such as lighting switches, switched socket outlets, etc., shall be fixed
       horizontal and where accessories are mounted locally they shall be in line either horizontally
       or vertically

       Cables shall be routed to follow the natural contours of the building, either parallel along
       joists or at right angles, to joists and vertically fixed when routed down walls. Diagonal
       routes will not be accepted

       Cables routed in accessible ceiling voids must be securely fixed and saddled

       The Contractor shall wherever possible endeavour to conceal the cables within the fabric of
       the building in such a manner that the damage to the fabric is kept to a minimum. Full use
       shall be made of any existing conduits in which the new circuits can be satisfactorily
       accommodated. Cables shall not be routed within cavities

       Wherever new circuits are routed within existing metallic conduits, these isolated lengths of
       conduit shall be between floor and roof space to switch positions. All conduits shall be
       cleaned, free from burrs and new bushes fitted before the insertion of any new circuits. Care
       shall also be taken to ensure that the I.E.E. Wiring Regulations concerning “space factor” is
       adhered to when reusing existing conduits. All other redundant conduit shall be removed


HSG 3657C                                         B/15
       No cable joints whatsoever will be permitted within the system of wiring. Junction or joint
       boxes shall not form any part of the installations. All cable terminations shall be made on the
       “loop in system” at accessory points

       Care shall be taken when removing and replacing floorboards. Any floorboards damaged
       during the work shall be replaced by the Contractor with new timbers. All floorboards which
       are disturbed during the progress of the works shall be securely screwed back into their
       original position

       In certain cases, cables will be allowed to be surface mounted and enclosed in PVC
       mini-trunking, i.e. store rooms, cupboards, tiled surfaces and artexed surfaces. In all cases
       the decision to fit surface mounted cables will be made in agreement with the Prime
       Contractor and Berneslai Homes

       No circuit cables shall be routed within 150 mm of any water pipes. Routing cables within
       boxed in pipework routes will not be permitted. If any instances arise where it is impossible
       to distance cables from water pipes, i.e. where pipes and cables may cross at right angles
       under floorboards, the pipes shall be locally insulated in Armstrong Armaflex Thermal
       Installation which shall be permanently secured with Nil-flam adhesive (Tel. Armstrong
       Products 01895-51122) for a distance of 300 mm either side of the position where cables and
       the pipes are unavoidably routed together

       No circuit cable shall be routed through a switch or socket outlet box, neither shall these
       cables be routed within 300 mm of an accessory box

1.19   PVC Insulated PVC Sheathed Cables
       These cables shall be PVC insulated and sheathed 250 volt copper conductors, in accordance
       with BSS 6004 and BASEC approved and shall be of one manufacture only throughout the
       contract. Cables shall be coloured in accordance with the 16th Edition of the I.E.E.
       Regulations. Non red coloured conductor shall not be used as switch wires. The wiring
       system shall be installed on the loop-in system without any joints, all connections shall be
       made at switch positions, lighting points, sockets outlets, etc.

       The PVC shall be suitable for resisting attack by oils, solvents, acids and alkalis. It should
       not readily ignite and shall cease to burn when the source of ignition is removed

       Where PVC insulated PVC sheathed cables enter an accessory box, the box edges shall be
       suitably grommetted and all sharp burrs shall be removed, the sheath of all cables shall enter
       the accessory box

       In all positions liable to mechanical damage, e.g. cables routed above joists, cables shall be
       protected in high impact PVC conduit or trunking, which shall, where metal, be bonded to the
       installations‟ main earthing terminal

       All cables shall be dressed flat and free from kinks and twists and shall be run in line with
       joists or at 90° to the same




HSG 3657C                                        B/16
1.20   Meter Tails
       These shall be of the single core PVC insulated PVC sheathed copper, conductor type
       BASEC approved, complying with BS 6004 - Table 6-8 and shall have a length of 2 metres,
       25 mm² copper cross sectional area

1.21   Cables for Lighting and Power Circuits
       These shall be flat twin or singles with an earth continuity conductor and shall be PVC
       insulated and sheathed. Single core cables when needed shall be PVC insulated and sheathed
       having an integral earth continuity cable

       Copper conductor sizes shall be as detailed below:

       Lighting Circuits                                1.5 mm² or 1.00 mm²
       Ring Final Circuits                              2.5 mm²
       Cooker Circuit                                   6.00 mm²
       Immersion Heater Circuit                         2.5 mm²
       Gas Central Heating                              1.5 mm²
       Solid Fuel Central Heating                       1.5 mm²
       Boiler Pump Circuit                              1.5 mm²
       Room Thermostat                                  1.5 mm²
       Smoke Detector                                   1.5 mm² or 1.0 mm²

       In all instances where the earth continuity cable is exposed it shall be fully sheathed in
       green/yellow insulated PVC sheathing complying with BS 2848

       Where PVC cables have been installed previously within the dwellings, this shall be brought
       to the attention of the Electrical Inspector before the commencement of any works

1.22   Flexible Cords and Cables
       All flexible cables and cords shall be as BS 6500:1969 volt grade heat resistant, having a
       minimum size of 30/0.25 mm rated in accordance with the equipment they serve. They shall
       be white multi-cord circular flexible cable or cords being insulated and sheathed

       Heat resistant cables shall be used throughout and shall be of butyl and silicone rubber or
       other equal and approved insulation, in accordance with BS 6500

1.23   Builders Work
       Wherever dust or damage is likely to occur within a dwelling for such items as forming
       classes in plasterwork, the Contractor must inform the tenant such that any necessary
       precautions can be taken to ensure that no possessions belonging to the tenant are damaged
       during the execution of this work. The Contractor shall supply dust sheets for use by his
       own staff or the tenant to protect any furniture or fitments which cannot be readily moved
       beyond the extent of the works

       Disturbance to wall decoration must be kept to a minimum. It is recommended that the
       Electrical Contractor score any wallpaper along the chasing line with a sharp knife, dampen
       the wallpaper and gently peel it away from the wall. After the replastering has dried
       sufficiently the paper must be restored using a suitable adhesive

       All rubbish and redundant materials shall be removed from the dwelling by the Contractor as
       it accumulates. The Contractor shall ensure that each dwelling is left in a clean condition
       before work ceases each evening


HSG 3657C                                        B/17
       The number and dimensional size of chases shall be kept to a minimum

       Wherever chasing will cause permanent damage to the decor of a property in such cases as
       PVC floor or ceramic tiled areas, etc., this situation shall be immediately brought to the
       attention of the Architect and all work shall cease until written instructions are given to the
       Contractor

       The final renovation plastering of the chases shall be undertaken with the greatest
       professional care, only remedial plasterwork equal to the original plaster finish in the
       dwelling will be acceptable. Any plasterwork falling below this standard will not be
       acceptable to the Architect

       All final plasterwork shall be in line with the existing wall surface, no “bumps or hollows”
       will be tolerated

       All other damage caused to the building fabric during the installation shall be suitably
       repaired and plastered

       All chases, holes, etc., formed in the building fabric to facilitate the concealed installation of
       the wiring cables must be finally plastered after a maximum period of 1 day after the
       completion of the wiring

       In any instances where cables routed in chases are energised before the final plasterwork is
       completed, care must be taken to ensure that in all cases where these cables enter any
       switchgear or accessory boxes all possible access holes are either plastered over or
       adequately sealed to prevent the insertion of any external objects into the equipment‟s live
       parts. Also all cables routed in unplastered chases which are required to be energised during
       the course of the works must be protected behind plastic cable sheathing throughout their
       entire length

       Where thermal roof insulation is installed within a dwelling and has to be disturbed, the
       Contractor shall be responsible for the necessary reinstatement, to the satisfaction of the
       Architect

       Where white tiles have been removed or damaged these shall be replaced as part of this
       Contract

1.24   Supplying, Fixing and Connection
       The Contractor shall include for the supplying, fixing, wiring and connecting of all materials
       mentioned in the Specification unless specific instructions to the contrary are given




HSG 3657C                                         B/18
1.25   Accessory Boxes/Rubber Grommetts
       Accessory boxes shall be of the following depths, being of steel construction:

       Lighting switch boxes          16 mm deep minimum
       Socket outlet boxes            25 mm deep minimum
       Cooker switch boxes            36 mm deep minimum
       Cooker connector boxes         36 mm deep minimum

       Only entry 'knock out' or purpose made access holes into these boxes shall be used to pass
       cables into these boxes. All cable access holes shall be free from burrs and suitably protected
       with rubber grommetts. The PVC oval conduit shall terminate within the accessory box and
       also within the floor or ceiling space

       All accessory boxes shall be bonded to the earthing system

       Where accessories do not have an earth terminal such as lighting switches, the earth bonding
       lead within the supply cable shall be covered in green/yellow P.V.C. sleeving and connected
       into the earthing terminal within the accessory box

       Where accessories such as socket outlets and cooker units have an earthing terminal the main
       supply wiring shall be connected into this terminal from which the 75 mm minimum length
       of 2.5 mm² copper green PVC insulated earthing lead shall be looped to bond the accessory
       box

       No existing accessory boxes may be re-used, all accessory boxes shall be new and shall be
       provided and installed as part of this Contract

       All accessory boxes shall be fully plastered in and the final plasterwork shall be in line with
       the existing wall surface. Accessories shall not be fitted until the new plasterwork has
       completely set or paintwork dry

       Dry fixing of accessory boxes will not be accepted




HSG 3657C                                        B/19
1.26   Mounting Heights
       The Contractor must confirm the mounting heights of all equipment with the Architect prior
       to commencing the site works, especially in aged persons' dwellings, and all kitchen areas
       where tiling, heights of worktops and refrigerator positions will influence mounting heights.
       The following information is given as a general guide for all dwelling types detailing the
       heights above finished floor level, to the underside of equipment

       Item                                                     Mounting Height (mm)

       Consumer Unit                                            1675

       Switchfuse Units                                         1675

       Lighting Switches                                        1350
                                                                1100 (Aged Persons‟ Dwellings)

       Switched Socket Outlets                                   450 (generally)
       (Special care shall be taken with these                  1100 (kitchens)
       units in kitchen areas to avoid any                       600 (Aged Persons‟ Dwellings)
       interference with tiled surfaces)

       Cooker Control Unit                                      1350 (to side of cooker)
                                                                1100 (Aged Persons‟ Dwellings)

       Flush Cooker Connector Box                                600

       20A D.P. Switch                                          1100 (for water heating adjacent to
                                                                     kitchen)
                                                                1350 (for water heating to kitchen)
                                                                 600 (for wall fire)

       Switched Fused Spur Unit                                 1350

       Flex Outlet Plate (generally)                             450

       Room Thermostat                                          1650
                                                                1100 (Aged Persons‟ Dwellings)

       5A Socket - Outlet                                       1000

       All locally mounted accessories shall be in line either vertically or horizontally

       Note -
       In dwellings designed for disabled persons, mounting heights shall normally be the same as
       for Aged Persons




HSG 3657C                                        B/20
1.27   Lighting Installation
       To minimise building works and damage to decor, all new light switch positions shall
       wherever possible be selected to coincide with the previous positions. This arrangement will
       allow the Contractor to make full use of any existing conduit switch drops

       Similarly, the existing lighting point positions shall be retained

       The lighting installation can be wired in PVC T/E or singles with earth on the loop in
       principal, using 3 plate ceiling roses or in the case of single cables, lives will be looped via
       the light switches. The use of junction boxes or separate connectors in accessories will not be
       allowed. Where tenant‟s own light fittings are to be reconnected, PVC singles shall be used.
       Where energy light fittings are to be installed the wiring shall be PVC singles with earth

       All “live” conductors including switch wires shall be coloured red. Where a twin cable is
       used as a live and switch wire this cable shall have both the conductors coloured red.
       Coloured sleeving for identification purposes will not be allowed

       The supply for the staircase light shall be derived from the ground floor lighting circuit and
       the neutral shall also be connected to this circuit. This may be carried out using single PVC
       PVC cable

       The lighting outlets shall be securely fixed to timber joists or cross timbers having minimum
       dimensions of 75 mm wide by 20 mm thick. Each outlet shall consist of a ceiling rose, a size
       0.75 mm² PVC insulated PVC sheathed (white) heat resisting flexible cored, of 150 mm
       overall length before making off, and a lampholder complete with a short skirt. All pendants
       shall be of the same length

       Where an external light is to be provided this shall be wired in single and earth PVC PVC
       insulated cable. Live loops shall not be permitted at external fittings. Final connections
       within the light fitting shall have heat resisting sheathing over the whole cable within the
       fitting

       Dwellings will not be provided with lamps, except when stated otherwise

       Lighting switches shall be of the flush pattern wall-mounted 5A 240V A.C. dolly or rocket-
       operated type mounted in 16 mm minimum deep accessory boxes complying with BS 3676,
       which shall finish square, level and flush with the finished plaster surface. Any accessory
       boxes which protrude beyond the finished plasterwork will be rejected by the Architect.
       Where pull cord switches are detailed for bathroom areas, they shall be fitted with cords of
       1000 mm length

       In areas where insufficient space is available, to insert a standard lighting switch, flush
       mounted architrave switches shall be used

       Where tenants wish to have their own existing lighting fittings refixed the Contractor shall
       allow for this work within his tender but inform the Architect of this situation before any
       work commences. The Contractor shall ensure that any tenant‟s equipment which is
       reconnected shall fully comply with the 16th Edition of the I.E.E. Wiring Regulations




HSG 3657C                                         B/21
1.27   Lighting Installation (Cont’d)
       All electrical work, which comprises the installation of new lighting points shall comply with
       Part „L‟ of the Building Regulations. A way of establishing how many locations to
       equipment with efficient lighting would be to follow the recommendations in the table
       below:-


                    Number of Rooms                            Minimum Number of Locations

                           1-3                                                1

                           4-6                                                2

                           7-9                                                3

                          10 - 12                                             4


       Hall, stairs and landings count as one room, garages, lofts and outhouses are excluded.

       Locations to be provided with efficient lighting are Kitchen, Hall, Bathroom, Outside.

1.28   General Purpose Power Points
       These shall be of the 13 amp double pole switch socket outlet flush type wired on the main
       ring principle. Spurs will not be allowed

       The switch socket outlets shall be mounted in 25 mm minimum deep boxes which shall
       comply with BS 1363. The boxes shall finish flush with the finished plaster surface

       Where 13 amp fused spur box units are specified, these shall be of the same manufacture as
       socket outlets and shall be switched with neon indicator lamps, the cover plate of the unit
       being finished as specified for the lighting switches, and mounted at the approved height
       immediately adjacent to the apparatus it serves

       No socket outlet, fused spur or switch shall be fitted on a chimney breast

       Rooms should be provided with a minimum of the following socket outlets

       Rooms                         Outlets

       Kitchen                       3 Twin Sockets in Bungalows and Flats
       Kitchen                       4 Twin Sockets in Houses
       Dining Room                   2 Twin Sockets
       Lounge                        4 Twin Sockets
       Bedrooms                      2 Twin Sockets
       Landing                       1 Single Socket
       Hall                          1 Single Socket

       Combined rooms should have sockets equal to the summation of the number for the
       individual rooms




HSG 3657C                                       B/22
1.29   Cooker Circuits
       The Contractor shall supply and install the cooker circuit, and where required by tenants who
       possess an electric cooker, shall make the final connections into the appliance. The 6 mm²
       PVC/T&E/PVC circuit cable shall emanate from the 32A amp MCB within the Consumer
       Unit and terminate within the cooker control unit fixed to the side of the proposed cooker
       position

       A flush cooker connector unit shall be supplied and installed at low level in a position behind
       the proposed cooker position. The interconnections cable between the connector unit and the
       cooker unit shall be supplied and fixed under this Contract

       Where a gas cooker is installed the Contractor shall be responsible for the disconnection and
       reinstatement for the purpose of fitting the connector unit, also to ensure no gas leaks occur
       after the cooker has been refitted

       Where tenants possess electric cookers the Contractor shall connect these units at the new
       low level connector point. This connection shall be made in 6.00 mm² PVC/T&E/PVC cable

1.30   Immersion Heater Installation
       The Contractor shall provide an immersion heater circuit as part of this Contract. The supply
       circuit shall be wired in 2.5 mm² copper PVC/T&E/PVC cable. The circuit cable shall be fed
       from a 16 amp MCB unit within the consumer unit and shall terminate in a 20 amp D.P.
       switch unit mounted within the cylinder cupboard. The switch shall be engraved “Water
       Heater”

       The isolating switch must be positioned such that it is out of reach of anyone touching the
       bath or sink taps. If this arrangement is not possible the Architect must be informed before
       any equipment is fixed

       No immersion heater, outgoing connections from the isolating switch, thermostat or thermal
       insulation shall be provided under this contract. However tenants own existing immersion
       heaters shall be reconnected




HSG 3657C                                        B/23
1.31   Smoke Detectors
       (a) 2 Storey Dwellings
           Supply and install on the first floor landing on ionization type smoke detector

             Supply and install on the ground floor hallway an optical type smoke detector

             The supply for the detector shall be derived from the consumer unit via 1.5 mm²
             PVC/PVC twin and earth cable

             First floor landing and ground floor hallway detectors shall be linked together using
             PVC multicore cable, so that activation of any detector shall operate both alarms

             Interconnections shall be carried out as recommended by the detector manufacturers

       (b)   Single Storey Dwellings and Flats
             Supply and install an optical type smoke detector

             The supply for the detector shall be derived from the consumer unit via 1.5 mm²
             PVC/PVC twin and earth cable

             In all elderly persons dwellings the new 240V smoke detectors are to be interconnected
             with the existing warden call systems. The Contractor shall allow for all necessary
             equipment, wiring, testing, commissioning to enable the smoke detectors to be linked to
             the warden call systems, the signal back to Central Call will say „FIRE‟ or „F‟ for fire

       Note It is essential that the detector head is fitted after the completion of all other works to
       prevent contamination from dust, etc., and that the gasket is fitted between the detector head
       and base

       The tenant shall be provided with full operating instructions for the unit and shall be
       made fully aware as to its function

1.32   Accessories
       Any accessory for which the use of is not obvious shall be engraved as to its function

1.33   The following appendices are enclosed with this Specification and form an essential part
       of the designs

       Appendix No. 1: Specified Equipment to be supplied and installed by the Contractor.

       Where this schedule details a choice of alternative equipment, such as for socket type and
       manufacturers, the Contractor may only select one specific type and manufacturer, and this
       equipment shall be standard throughout the Contract

1.34   Replacement of New Electrical Services Supplied by Tenant
       In instances where tenants have provided their own electrical circuits for equipment covered
       by this Contract, the Contractor shall inform the Architect of this situation. Items falling into
       this category include immersion heater circuits, cooker circuits, central heating controls, wall
       lights, etc. Where the Architect decides that these circuits may be reused the cost of this
       element of the works shall be omitted from the works in accordance with a written instruction
       during the currency of the Contract



HSG 3657C                                        B/24
1.35   Setting Out of Electrical Works
       Where the layout of electrical services has been shown on a house type drawing they shall
       generally be adhered to when undertaking the works. However, the Contractor must be fully
       prepared to allow a degree of flexibility to the final positioning of items of equipment within
       individual dwellings where requested by the tenant and approved by the Architect. These
       minor modifications to the final equipment positions shall be undertaken by the Contractor at
       no additional cost to the Tender

       The position of all electrical equipment must be agreed with each tenant and the Electrical
       Inspector/Engineer before the works start

       Where a schedule of equipment is given for each dwelling, each tenant must be informed of
       the number of accessories in each room and the tenant must agree the positions of the
       equipment

1.36   Architraves
       Cables shall not be routed behind or within 100 mm of door frames and architraves

1.37   Fixing of Recessed Equipment Within Plasterboard/Timber Studding Walls
       All accessory boxes which require recessing into the above type of wall shall employ:
       Tenby Fast Fix for mounting in dry partition walls or on an equal and approved equivalent
       system

1.38   Plant and Equipment
       Contractors shall use their own plant and equipment only to execute the works. On no
       occasion should equipment such as steps, ladders, or tools belonging to householders be used
       in order to undertake the works

       The Contractor and his employees shall not use their own portable radios in the tenants‟
       dwellings

1.39   Aged Persons Dwellings - Special Requirements
       In Aged Persons Bungalows and Flats only, light switches shall be wide rocker type.

1.40   Dust Sheets/Removal of Dust
       The Electrical Contractor must provide sufficient dust sheets to cover all tenants‟ furniture in
       all rooms where work is proceeding. Failure to provide adequate dust sheets may cause the
       site works to be halted

       All dust sheets shall be in a clean condition, and shall not deposit dust on the items covered

       The Contractor must provide on site an industrial vacuum cleaner which shall be used to
       remove any dirt caused through chasing immediately the rubbish has been created




HSG 3657C                                        B/25
1.41   Plastering
       All chases, holes, etc., formed in the building fabric to facilitate the concealed installation of
       the wiring cables must be finally plastered after a maximum period of 1 day after the rewiring

       The final fixing of all accessories shall only occur after the final completion of all plastering
       to chases, holes, etc. If instances occur where accessories are temporarily installed, before
       the completion of the plasterwork, these accessories shall be removed to allow the plastering
       to be completed and then re-installed only when all the renovation work is finished

       In any instances where cables routed in chases are energised before the final plasterwork is
       completed, care must be taken to ensure that in all cases where cables enter any switchgear or
       accessory boxes that all possible access holes are either plastered over or adequately sealed to
       prevent the insertion of any external objects into the equipment‟s live parts. Also all cables
       routed in unplastered chases which are required to be energised during the course of the
       works must be protected behind PVC oval conduit throughout their entire length

1.42   Incomplete or Unsatisfactory Work
       All safety items listed on the Architect's written report forwarded to the Contractor shall be
       immediately attended to, all other items shall be rectified within a maximum of 7 working
       days from receipt of the report

       The Architect shall be informed in writing upon the completion of the items listed

1.43   Contractor’s Supervision of the Works (applies to full rewires only)
       Throughout the Contract period the Contractor shall provide a nonworking Contract
       Supervisor, who‟s responsibility will be to liaise with the tenants, Housing Department and
       Barnsley M.B.C.‟s Electrical Inspector on site. Part of the supervisors duties will be to snag
       each dwelling to ensure compliance with this specification.

       The non working Supervisor shall be on site for a minimum of four hours of each working
       day, and be available for consultation with the Housing Department, tenants and Barnsley
       M.B.C.‟s Inspector

       The Contract Supervisor shall be supplied by the Contractor with mobile telephone, the
       number of which shall be given to Barnsley M.B.C.‟s Client Departments. A 24 hour
       emergency call out device shall be provided by the Contractor throughout the Contract Period

1.44   Shower Circuit
       Where required a shower circuit shall be installed using 10 mm² PVC/PVC T&E cable along
       emanating from a 40 amp 30mA MCB/RCD in the consumer unit and terminating within a 45
       amp double pole pull switch within the shower/bathroom area. The interconnecting cable
       between the pull switch and shower is to be 10 mm² PVC/PVC T&E and fitted as part of this
       circuit. The Contractor is to allow for the fitting of the shower unit and all necessary
       plumbing connections that are required

1.45   Fans
       Where required install a circuit to feed an extract fan, the supply is to be taken from the
       lighting circuit, and mounted adjacent each fan shall be an unswitched fused spur for fans
       with humidistats incorporated, and triple pole isolators adjacent fans with run on timers
       incorporated




HSG 3657C                                         B/26
1.46   Ground Floor Flats and First Floor Flats
       When rewiring ground floor flats all wiring shall be concealed behind Gyproc plaster coving
       in halls, kitchens, bedrooms and lounges. The electrical contractor shall employ a specialist
       contractor to install the coving. When rewiring first floor flats the existing consumer unit may
       be located in a cupboard at the bottom of the stairs leading up to the flat, the new consumer
       unit shall be fitted in a suitable location in the flat itself with a switch fuse fitted in the stairs
       cupboard and a suitable sub main enclosed in PVC trunking.

1.47   Central Heating Wiring

       Power Supply to Heating Systems
       Dwellings which are to have central heating installed and have an existing re-wireable
       consumer unit, shall have the consumer unit replaced with an insulated MCB Consumer Unit
       complete with integral Residual Current Operated Circuit Breakers and insulated back. The
       Consumer Unit shall be situated such that the meter tails are kept as short as conveniently
       possible

       The Consumer Unit shall have a split busbar system. One busbar will be fed via a 100 mA
       time delayed RCD and the other busbar via a 30 mA RCD

       The Consumer Unit shall possess the following MCB outgoing ways:-

       Fed from the 100 mA RCD:

       1 - 6 amp lighting circuit    - Ground Floor and Staircase
       1 - 6 amp lighting circuit    - First Floor
       1 - 6 amp spare
       Fed from the 30 mA RCD:
       1 - 32 amp ring final circuit (13 amp switch socket outlets) - Ground Floor and First Floor
       (2 or 3 BEDROOM DWELLINGS ONLY)
       1 - 16 amp radial circuit focal point fire - Lounge
       1 - 10 amp radial circuit fan heater - Bathroom
       1 - 32 amp cooker circuit
       1 - 16 amp immersion heater circuit
       1 - 6 amp central heating controls circuit
       Blank plates as required
       TYPE 2 MCB‟s shall be used

       All consumer units shall be clearly labelled as to their purpose. Within the insulated fuse
       cover plate the Contractor shall supply and install a TYPEWRITTEN circuit chart, which
       shall be enclosed within a clear plastic holder suitably glued to the inside of the cover plate.
       This chart shall indicate the MCB ways, rating of MCB‟s, circuits controlled and size of
       circuit cable

       Rough, handwritten circuit charts will not be accepted by the Architect



HSG 3657C                                           B/27
1.47   Central Heating Wiring (Cont’d)

       Power Supply to Heating Systems (Cont’d)
       Where an RCD has been fitted in the meter tails or in the consumer unit, this shall be brought
       to the attention of the Electrical Inspector before commencement of any work.

       The tenant shall be provided with full operating instructions for the MCB/RCCD Consumer
       Unit and shall be made fully aware as to its function

       All the existing circuits shall be reconnected into the new consumer unit and a circuit chart
       shall be fitted to clearly identify the circuits being controlled

       Meter Tails
       The existing meter tails are to be renewed using 25 mm² PVC/PVC copper cable and the
       main earth bonding lead to 16 mm² green/yellow PVC copper cable

       The circuit for the heating system shall be wired in 1.0 sq. m. PVC/PVC T&E

       The consumer unit to be supplied and fitted by the Electrical Contractor shall be of the type
       and manufacture listed in the Schedule of Materials

       Controls for Solid Fuel Boilers
       The installations shall consist of a Radial circuit from the consumer unit to a switched fused
       spur unit and cord outlet mounted on a dual accessory box positioned local to the hot water
       cylinder. The cord outlet shall be used for the connections to the pipe/cylinder thermostat

       Adjacent to the fire shall be fitted a flush 20A DPS with neon to control the central heating
       pump. The cylinder/pipe thermostat shall be wired so that it will override this switch.
       Adjacent the pump a 50A socket outlet and moulded box. Final connections to the pump
       shall be via a 5A plug head and heat resisting butyl flex

       The fused spur unit adjacent the cylinder shall be engraved “Heating Isolator - Do Not Switch
       Off”. The 20A DP switch shall be engraved “heating”. The spur outlet shall be fused at 3
       amps

       Controls for Gas Fired Boilers
       The installation shall consist of a radial circuit from the consumer unit to a fused isolating
       switch having a pilot light situated in the cylinder cupboard local to the valve, pump, etc.,
       fused at 3 amps. The isolating switch to be engraved „Heating Isolator‟. From this isolator a
       supply shall be taken to a Double Pole Isolator having a pilot light situated in the Lounge
       local to the programmer, this shall also be engraved „Heating Isolator‟ and be fused at 3
       amps. Supplies from the isolator in the Lounge shall then be taken to the programmer in the
       Lounge and the wiring centre in the cylinder cupboard. The programmer to be supplied and
       fixed in the Lounge is to be a Randall Set 3E. Adjacent the isolating switch in the cylinder
       cupboard is to be mounted a Honeywell wiring centre, from which supplies to the valve,
       thermostats and pump will be taken. The final connections to the cylinder thermostat, pump
       and boiler shall be in heat resistant temperature Butyl 3 or 4 core flex, with the final
       connection to the pump via a 5 amp socket outlet and plughead and the final connection to
       the boiler via a Double Pole Isolator with neon or a Triple Pole Isolator for fires with lights
       on, both these isolators are to be engraved „Boiler Isolator‟. A room thermostat is to be
       supplied and installed and wired into the wiring centre in the cylinder cupboard, final position
       of room stat is to be agreed on site. Flexes are not to be used for fixed wiring


HSG 3657C                                        B/28
1.47   Central Heating Wiring (Cont’d)

       Controls for Electric Heating
       The installation shall consist of radial circuit wired in PVC/PVC 2.5 mm² T/E cable wired
       from a new Consumer Unit at meter positions, to a 20 amp D/P switch local to storage
       heaters. The final connection to storage heater is to be made in butyl high temperature heat
       resisting flex

       Storage heaters to be from the Dimplex XLN range, size of heaters to be determined by size
       of room. All heaters to be fitted with shelves directly above heater

       The new distribution board is to be a 10 way board with a 100A 100mA RCD with 16A
       MCB‟s for all circuits and blanks where required. The new board shall be clearly labelled as
       to its purpose and have a typed written circuit chart

       In all bathroom areas a Dimplex FX20 fan heater is to be installed at high level. Circuit for
       fan heater is to be a radial circuit wired in PVC/PVC 2.5 mm² T/E cable wired to normal
       tariff fuse board on a 10A MCB. Local isolation for fan is to be an unswitched fused spur
       mounted at high level above fan heater, with final connection to fan heater in butyl 3 core
       flex

       Water Heater
       In the cylinder cupboard the existing hot water cylinder is to be replaced with a Super 7
       combination cylinder (210 litre hot - 45 litre cold) complete with econoplus lagging, 1 Nr.
       immersion heater box and anode. There is to be 1 Nr. 24” immersion heater with thermostat,
       which will be controlled via an Economy 7 Water Heater Controller

       Focal Point Fire
       A radial circuit is to be installed from consumer unit in 2.5 mm² PVC/PVC T/E cable to a
       switched fused spur with neon fitted local to fireplace in lounge. A focal point electric fire is
       to be installed and connected to local isolator via butyl heater resistant flex

       Yorkshire Electricity
       The Contractor is to liaise with Yorkshire Electricity to arrange for any existing meters to be
       changed to Economy 7 metering

       Cavity Wall Insulation
       Rockwool Energy Saver cavity wall insulation is to be installed by an approved firm and in
       accordance with British Board of Agrement Surveillance Scheme, BBA Certificate No.
       86/1779 or 87/1813 or British Standards 6232 Parts 1 and 2 1982 and following specification

       Survey of Existing Walls
       Before starting work carry out a survey to BS 8208: Part 1 to confirm suitability for filling
       with cavity insulation and submit a report stating:-

          Form of construction, materials used and any other variations
          General condition of walls
          Thickness of walls
          Width and condition of cavity
          Exposure to wind driven rain
          Nature and extent of remedial work and other work require to ensure stability
          Any other information considered relevant


HSG 3657C                                        B/29
1.47   Central Heating Wiring (Cont’d)

       Remedial Work
       Shown to be necessary by the survey - will be the Employer‟s responsibility (but not sealing
       up gaps/openings - see clause 310). Obtain instruction or otherwise ensure that the work has
       been satisfactorily completed before starting remedial work

       Suitability of Walls
       Ensure all cavities are thoroughly cleared out prior to the installation of the cavity wall
       insulation. Before, during and after filling of cavities, check suitability of walls to BS 8208:
       Part 1. Report any defects to CA as soon as possible and stop filling until rectified

       Cavity Fill
       Installed by an approved firm in accordance with the British Board of Agrement Surveillance
       Scheme

       Gaps/Openings
        Seal openings into cavity where necessary to prevent loss of fill, using mineral fibre
         packed tightly
        Remove air bricks/grilles of untrunked vents. Seal openings into cavity with mineral
         fibre or insert an approved sleeve to keep opening permanently clear

       Injection Holes
       Form neatly to a regular pattern and to sizes recommended by cavity fill manufacturer.
       Avoid damage to damp proof courses, cavity trays, flues, etc., and prevent debris falling into
       cavity. Form all holes in any one wall before commencing filling of that wall

       Making Good
       Remove any blockages from vents and refix or replace any air bricks. Fill injection holes,
       replacing existing materials where possible to ensure a close match of colour and texture with
       existing surface. Obtain approval of finished appearance of first few holes before completing
       the remainder

       Flues with No Appliance
       Check for and remove any blockages. Carry out a smoke test if a full inspection cannot be
       made. Inform CA before inspection and testing

       Flues with an Appliance Fitted
       To be tested before and after filling cavities. Inform CA before testing. Remove any
       blockages and retest as necessary until performance is necessary

       Records
       Keep a detailed record of the installation including survey results, materials, weather
       conditions and any unusual features

       Documentation
       Copies of all certificates, records, guarantees and other documents provided by the Sub-
       Contractor to be submitted to CA on completion




HSG 3657C                                        B/30
1.47   Central Heating Wiring (Cont’d)

       Inspection and Testing
       During the progress and upon the completion of the installation, and prior to being energised,
       the works shall be thoroughly inspected and tested in strict accordance with Part 7 of the
       16th Edition of the I.E.E. Wiring Regulations

       Test and Completion Certificate

       Test Certificate
       Following the testing and inspection of the electrical works in accordance with Part 7 of the
       I.E.E. Wiring Regulations, 16th Edition, one copy of an N.I.C.E.I.C. Electrical Test
       Certificate shall be returned to the Architect

       The results of all tests shall be recorded stating the highest finite reading. Statements such as
       „greater than‟ or „infinity‟ will not be accepted

       SCHEDULE OF MATERIALS

       Consumer Units                                )       MEM Delta AP 37 HEMET/BC
                                                     )       Wylex NSSTM6306
       Consumer Units                                )       Wylex NDRM2004
       Electric C/H Only                             )       MEM AP8ME

       Solid Fuel Systems                            )
       Switched Fused Spur                           )
       Cord Outlet                                   )
       Dual Accessory Box                            )
       20 Amp D/P/S with Neon 5 Amp Socket           )       MEM Delta
                                                     )       Volex
       Gas Fire Boilers                              )       Tenby
       Fused Isolating Switch with Neon              )       Ashley
       20 Amp D/P S/W for Boiler     )
       3 Pole Isolator for Boiler                    )
       5 Amp Socket                                  )
       Randall SET 3E Timeclock      )

       Electric C/H Controls
       Double Pole Switch
       Unswitched Fused Spur
       Switched Fused Spur with Neon
       Randall ET009 7 Day Time Controller

       Contractor may select from any of the above manufacturers. Once selected that particular
       manufacturer must be used throughout the length of the contract period.

       NOTE: All electrical works must be completed no later than the day following the
             completion of the heating installation. Temporary connections will only be
             accepted in emergency situations and with the permission of the Architect




HSG 3657C                                        B/31
APPENDIX NO. AP.A/1

SPECIFIED EQUIPMENT TO BE SUPPLIED AND INSTALLED BY THE CONTRACTOR
OR OTHER EQUEL APPROVED
Where the Contractor has a choice of accessories, only one type may be selected to be used throughout
the Contract, unless otherwise stated.


EQUIPMENT                             CHOICE OF                         RESPECTIVE
                                      MANUFACTURER                      CAT. NO./RANGE

2.01 CONSUMER UNIT -                  MEM DELTA                         Cat No. AP73HEMET/BC
      DWELLINGS                       HAGER                             Cat. No. VTCOS46-6H
Complete with 100A 100 mA and         G.E.                              VCBD7A7
100A 30 mA RCCB and 10 No.            WYLEX                             NHSTM8404
outgoing MCB‟s. Insulated
surface mounted unit to
BS 5486:Part 13

2.02 CABLES AND FLEXIBLES             BASEC Approved Cables             Common Ranges
(Only one manufacturer may            Contractors must ascertain        PVC/T&E/PVC Cables
be selected).                         that the individual cables they   copper conductor flat
All flexible cables shall be of the   select have individual BASEC      formation
white circular heat resisting type    approval and to BS 6004.          Ref. Type 6181Y
                                                                                  6242Y
                                                                                  6143Y
                                                                        For twin cables used as live
                                                                        and switch, wires shall be
                                                                        coloured Red.

2.03 BATTEN LAMPHOLDER                MEM DELTA                         Cat. No. 14
                                      VOLEX                             Cat. No. VX9215HO
                                      TENBY                             Cat. No. 7622
                                      ASHLEY                            Cat. No. HAL 96T

     CEILING PENDANT                  MEM DELTA                         Cat. No. 1251
                                      VOLEX                             Cat. No. VX6677
                                      TENBY                             Cat. No. 7660
                                      ASHLEY                            Cat. No. 624 HAL 2126

2.04 LIGHTING SWITCHES    MEM DELTA                                     Moulded Range
     ARCHITRAVE SWITCHES VOLEX
     & PULL CORD SWITCHES TENBY
                          ASHLEY
                          LEGRAND

     FOR AGED PERSONS                 MK LOGIC PLUS                     K4781
     DWELLINGS ONLY                   WIDE ROCKER
     I.E. BUNGALOWS AND               MEM
     FLATS                            BROAD ROCKER RANGE                2830




HSG 3657C                                    AP.A.1/1
APPENDIX NO. AP.A/1 (Cont‟d)



EQUIPMENT                      CHOICE OF                RESPECTIVE
                               MANUFACTURER             CAT. NO./RANGE

2.05 SOCKET OUTLETS            MEM DELTA                All Sockets Shall be
                               VOLEX                    Double Pole Switched
                               TENBY
                               LEGRAND

2.06 WATER HEATER              MEM DELTA                Cat. Nos.
     SWITCH FUSED SPURS        VOLEX                    2203
                               TENBY                    VX9060WHI
                               ASHLEY                   7660
                               LEGRAND                  624 HAL 2126

2.07 COOKER CONTROL UNIT       VOLEX                    VX9701
                               MEM DELTA                2011
                               TENBY                    7774
                               ASHLEY                   CCU2000
                               LEGRAND

    CABLE OUTLET               MEM DELTA
                               VOLEX                    VX9704
                               TENBY                    7080
                               ASHLEY                   CC053
                               LEGRAND

2.08 PVC OVAL CONDUIT          To BS 4607, 6099, 4678   MARSHALL TUFLEX
     AND PVC MINI                                       EGA TUBE
     TRUNKING

2.09 CABLE CLIPS               (a)   TENBY
                               (b)   TOWER
    CABLE MARKERS              (c)   CRITCHLEY

2.10 EARTHING CLIPS            TENBY                    EC 15/16
     PORCELAIN                 TENBY                    LP 61/2
     CONNECTORS

2.11 SWITCH AND SOCKET         AS ACCESSORY             Galvanised
     BOXES                     MANUFACTURER             Electro Plated

2.12 OUTSIDE LIGHT             FERN HOWARD              FH20R28-W
     BULKHEAD FITTING          COLUMBUS




HSG 3657C                             AP.A.1/2
APPENDIX NO. AP.A/1 (Cont‟d)



EQUIPMENT                      CHOICE OF                 RESPECTIVE
                               MANUFACTURER              CAT. NO./RANGE

2.13 SMOKE DETECTOR            ALCO -
                               (Tel. No. 01691 657466)
                               240 VOLT OPTICAL          166
                               240 VOLT IONIZATION       161
                               MOUNTING BASE             127
                               RELAY BASE                128

2.14 SWITCH FUSE               WYLEX                     110M/80

2.15 SHOWER SWITCH             MEM                       1340
                               TENBY                     7545
                               VOLEX                     VX9706

2.16 FANS                      XPELAIR                   CF20W BATHROOM
                                                         CF40W KITCHEN
                                                         COMPLETE WITH
                                                         DUCT AND ALL
                                                         NECESSARY FITTINGS

2.17 FAN ISOLATOR              MEM                       2414
                               VOLEX                     VX1013

2.18 KITCHEN LIGHT             CROMPTON                  CP512/CPC51
                               CROMPACK 5

2.19 BATHROOM LIGHT            FERN HOWARD               FH93228-W/OP
                               MERIDIAN

2.20 HALL LIGHT                FERN HOWARD GALILEO       FH20-325-28-W

2.21 ELECTRIC SHOWER           TRITON                    MILLENNIUM CARE
                                                         THERMOSTATIC
                                                         ELECTRIC SHOWER
                               MIRA                      ADVANCE




HSG 3657C                             AP.A.1/3
            APPENDIX C

    GUIDANCE FOR DRILLING HOLES
    THROUGH DECORATIVE COATED
        SURFACES (E.G. ARTEX)




HSG 3657C
                                        APPENDIX C

GUIDANCE FOR DRILLING HOLES THROUGH DECORATIVE COATED SURFACES
                           (E.G. ARTEX)

This guidance is solely for drilling holes through surfaces which have a decorative coatings
(e.g.artex) in Council properties.

All decorative coated ceilings shall be assumed to contain asbestos. All other decorative
coated surfaces on walls etc, shall be pre-determined by means of survey/sampling, prior to
any works being carried out.

SAMPLING/AIR TESTS

During the works a number of pre-determined personal sampling/air tests shall be carried out
to determine the level of exposure to asbestos fibres that may be present, (the personal
sampling/air tests results shall be forwarded to the asbestos controller during and on
completion of works).

The following guidance shall be followed in all circumstances when drilling through
decorative coatings.

Drilling

   The appropriate personal protective clothing/equipment shall be worn at all times while
    carrying out any drilling. (Refer to EM6 Asbestos Guidance Task Manual).
   The entry points to be drilled shall be coated with a generous amount of paste.
   The hole drilled shall be large enough to take into account any sleeving which is
    necessary to allow pipes/cables etc., to pass through without abrasion on entry/exit points.
   On completion of drilling use wet rags to clean off surplus paste and debris (refer to EM7
    Asbestos Guidance Task Manual).
   Seal drilled edges with a propriety surfacant.
   The above guidance shall be used when drilling holes to fix radiator brackets, associated
    pipework, electrical fittings and fixtures etc.

Cleaning

 Wet rags shall be used to clean equipment/area (refer to - EM7 Asbestos Guidance Task
  Manual).
 All debris/used rags and overalls etc., upon completion, shall be sealed in red marked
  polythene bags and placed in a lockable container labelled asbestos waste, and
  subsequently cleared from site to a registered transfer station or licenced tip, in
  accordance with approved methods of satisfying statutory requirements.

THE ABOVE GUIDANCE IS THE MINIMUM STANDARD TO BE USED.




HSG 3657C                                       C/1
                                           -2-

References

   The Health and Safety at Work Etc., Act 1974
   The Management of Health Safety at Work Regulations 1999
   The Construction (Health Safety and Welfare) Regulations 1996
   The Control of Asbestos at Work Regulations 1987
   A Guide to the Asbestos (Licensing) Regulations 1983 as amended
   Asbestos Essentials Task Manual Guidance Sheets (HSG 210)
   Methods for Determination of Hazardous Substances (MDHS 100)

Contacts

Corporate Health and Safety Unit                  -     01226 772274

Asbestos Controller (Property and Procurement)    -     01226 774354




HSG 3657C                                   C/2
                APPENDIX D

            STRUCTURAL REPAIRS




HSG 3657C
                                        APPENDIX D

                                 STRUCTURAL REPAIRS


1.00   SPECIFICATION FOR WALL-TIE REPLACEMENT AND SUPPLEMENTATION

1.01   Introduction

       If it is proposed to remove all the existing wall ties and replace with remedial stainless
       steel wall ties and in areas where there are insufficient numbers of ties, additional
       stainless steel remedial wall-ties will be introduced. Two types of remedial tie will be
       used, depending on whether it is a replacement tie or an additional tie.

1.02   General

       1. Erect scaffolding to all elevations to be treated.

       2. With a metal detector, locate and mark position of all the existing ties with chalk.

       3. Using a different coloured chalk, mark positions where supplementary ties are
          required. The total number of wall ties should equate to a density of at least 2.5
          ties per square metre (roughly 900 mm centres horizontally, 450 mm centres
          vertically, staggered alternate rows). In addition there should be ties at 300 mm
          centres vertically either side of a door or window reveal and along the verge line
          of the gable wall. These ties should be at a maximum distance of 225 mm from
          the reveal or the verge line. If there is any uncertainty over the requirements for
          supplementary wall ties, please contact the Structural Engineer.

1.03   Replacement Wall Ties

       1. Carefully remove, without damage, a brick from the course below the existing tie.
          Clean off the mortar and set aside for reuse. Completely remove the existing tie
          and make good the inner leaf with gauged mortar (1:1:6) in sulphate resisting
          cement:lime:sand.

       2. Drill a 12 mm diameter hole 75 mm into the inner leaf. This hole shall be at least
          20 mm from any block edge and be thoroughly cleaned by air-flushing and the use
          of a bottle brush.

       3. The top exposed surface of the outer leaf brickwork shall be thoroughly cleaned
          using a wire brush and then air blowing.




HSG 3657C                                    D/1
       4. Using a suitable applicator with an extension nozzle, completely fill the hole in
          the inner leaf with Hilti HIT HY50 resin or Resifix 3P by Exchem Mining and
          Construction Ltd., or other equal approved. All the above materials shall be
          mixed, handled and applied strictly in accordance with the manufacturer‟s
          recommendations.

       5. A new wall tie shall be inserted into the inner leaf blockwork for the full depth of
          the hole. The tie shall be bent down to the bed joint of the outer leaf and fixed
          down to the lower brick with a dab of the above resin. These ties shall be 4 mm
          diameter and be of sufficient length to project a minimum of 50 mm into the
          external leaf, whilst giving at least 25 mm cover to the outer face. The wall ties
          shall be wavy tailed butterfly type wall ties manufactured from austenitic 18/8
          stainless steel and shall comply with BS 1243: 1978 (e.g. wavy tail tie ref. AC-31
          by Ancon Clark, Sheffield or equal approved).

       6. The resin shall be allowed to set prior to replacing the brick previously removed.
          The brick shall be set in gauged mortar (1:1:6) with sulphate resisting
          cement:lime:sand. Slate packing should be used if necessary to make up joints of
          excessive depth.

       7. 10% of the new ties are to be tested for pull-out by the Structural Engineer prior to
          fixing in the outer leaf. Adequate notice shall be given to the Structural Engineer
          of when the ties are to be fixed. Where additional ties are to be introduced to
          bring the density of wall ties up to that specified above, they are to be installed in
          accordance with the following section of this specification.

1.04   Supplementary Wall Ties

       1. Drill a 12 mm diameter hole through the centre of an outer leaf brick to give a 5
          degree fall to the outer face.

       2. Continue drilling the hole 75 mm into the inner leaf. Clean the hole by air
          flushing and the use of a bottle brush.

       3. Using a suitable applicator with an extension nozzle, completely fill the hole in
          the inner leaf with Hilti HIT HY50 resin or equal approved.

       4. Insert a Hilti DWR 50/80 remedial wall tie or equal approved for the full depth of
          the hole in the inner leaf. Allow the resin to set (in accordance with
          manufacturer‟s recommendations). Set the wall tie in the outer leaf. The wall ties
          are intended to be used fully in accordance with the manufacturer‟s
          recommendations.

       5. The remainder of the hole is to be filled with colour matched hand pointing
          mastic.

       6. 10% of the new ties are to be tested for pull-out by the Structural Engineer prior to
          fixing in the outer leaf. Adequate notice shall be given to the Structural Engineer
          of when the ties are to be fixed.




HSG 3657C                                    D/2
1.04   Supplementary Wall Ties (Cont‟d)

       NOTE:       If butterfly wire ties are found to be present, then the specification for
                   „Supplementary Wall Ties‟ will apply.

2.00   CONCRETE REPAIRS

2.01   Generally

       The concrete repairs are to provide long term, remedial treatment to all damaged
       concrete and is to include a protective and decorative coating to all concrete exposed
       on the elevation thus minimising further weathering and carbonation. The work
       involves hammer testing the concrete surfaces, removing all loose and cracked
       concrete including unsound, previously repaired areas, abrasive blast cleaning the
       concrete and exposed reinforcing bars to bright metal including removing all loose
       rust and scale, applying reinforcement protection bonding bridge and repair filling, all
       as required by the repair system adopted, the surface of which is to be trowelled flush
       with existing concrete face, surface preparation and decorative/protective coating.

       Notwithstanding the sequence of operations implied above or in the items of
       measured work, the Contractor is to allow for any alternative sequence of operations
       required by the material supplier.

2.02   Health and Safety

       Where the client department requires the building to remain occupied whilst concrete
       repairs are undertaken the Contractor shall accept that both occupants and the general
       public are unaware of the risk of assessment process. In all instances, therefore, areas
       where the general public may be present shall be fully protected, or access closed for
       the duration of the risk.

       The Health and Safety Plan shall describe specific risks identified in the design
       process and the Contractor shall take these into account in the development of this
       plan.

2.03   Materials

       All materials used during the repair procedure are to be compatible with each other
       and with the surface to be treated and are to be capable of restoring all structural
       elements to their original load carrying capacity.

       The materials used for the repair work, protective and decorative coatings shall be
       purchased from one of the approved manufacturers (see attached list). Materials shall
       be pre-packed and delivered to site in sealed containers and must be mixed and
       applied strictly in accordance with the manufacturer‟s system of repair.




HSG 3657C                                     D/3
2.03   Materials (Cont‟d)

       The system adopted is to be a complete manufacturer‟s system. If the system includes
       treatments not specified and not measured in the Bill of Quantities, these treatments
       will be deemed to have been included in the measured items. All material delivered
       to site is to be properly stored and is not to be used in temperatures below that stated
       by the manufacturer. Written assurance must be obtained from the material supplier
       that the material chosen adheres strictly to this specification, and that the correct
       material has been specified for the type of repair and is compatible with the surfaces
       to be treated and is to remain effective for the environmental conditions experienced
       in this locality.

       This written assurance must be submitted to the contract administrator for his
       approval prior to the commencement of concrete repairs.

       Sufficient testing to verify compatibility is to be carried out by contractor. This is
       deemed to be included in his rates.

3.00   WORKMANSHIP

3.01   Hammer Tests

       Concrete surfaces are to be checked by tapping lightly with a hammer, and all
       unsound concrete and previously repaired areas are to be identified by outlining each
       area with a suitable coloured crayon to be agreed with the Clerk of Works or
       Engineer.

3.02   Depth of Carbonation Tests

       The depth of carbonation in the concrete of the various elements is to be assessed
       using the technique as described in BRE Information Paper IP6/81.

3.03   Removing Unsound Concrete Including previously Repaired Areas

       All loose and cracked concrete surfaces are to be cut out until corrosion free
       reinforcement is reached. Reinforcement is to be exposed for its full perimeter and
       along its length until corrosion free reinforcement is reached and the concrete
       surrounding the reinforcement has a sound, alkaline base, as indicated by the
       carbonation test IP6/81. All unsound previously repaired areas are to be cut out and
       any reinforcement is to be exposed as described above. Small diameter reinforcement
       when exposed may be knocked back wherever possible subject to the agreement of
       the engineer to obtain greater concrete cover prior to the application of the repair
       material.

       On cutting back, feather edging will not be permitted. The minimum thickness of the
       repair must be as stated by the supplier.

       The Contractor is to ensure that driving rain is prevented from penetrating the
       structure during breaking out.




HSG 3657C                                    D/4
3.04   Cleaning

       Concrete surfaces and areas exposed after removal of cracked concrete are to be blast
       cleaned to remove material deleterious to the future treatment. If surfaces have been
       previously painted or rendered this must be removed to allow satisfactory repair.
       Exposed reinforcement is to be abrasive blast cleaned to remove loose material and
       corrosion, in accordance with the Swedish Standard SA2 ½

       Protection must be provided to all walls and openings in walls, i.e. air grates, etc.
       whilst blast cleaning is in progress. Glazing should be protected if necessary against
       over blast and windows and doors sealed with tape to prevent dust penetration inside
       the building. Where repairs are not carried out immediately after cleaning, the
       surfaces may, if required by the Engineer require further treatment. High pressure
       water jetting will not used without the approval of the Engineer.

3.05   Reinforcement Protection

       Immediately after cleaning, the reinforcement is to be protected with the material
       specified by the approved system manufacturer.

3.06   Bonding Bridge

       Apply a bonding bridge or adhesion promoter containing acrylic polymer additives or
       derivatives from the adopted system manufacturer‟s range.

3.07   Repair Filling

       Whilst the bonding layer is wet, build back to the required profiles with an acrylic
       polymer modified cementitious mortar containing graded aggregates of suitable size
       for the depth of repair, all obtained from the system manufacturer. The Contractor
       must include for all necessary formwork required to reinstate arises and drip grooves
       etc. Repaired areas are to be well compacted for the full depth of the repair and cured
       in accordance with the manufacturer‟s recommendations.

3.08   Decorative and Protective Coatings

       a) To surfaces permanently exposed externally.

3.09   Surface Preparation

       Apply a cementitious coating and/or surface stabiliser and/or pore filler to the whole
       of the exposed concrete surface, as required by the material supplier to give a surface
       suitable for receiving the final paint coatings.




HSG 3657C                                   D/5
3.10    Treatment

        The full surface and long term protective is to comply with the following
        requirements.

        1.     All treatments are to be compatible one with the other and with the surface to
               be treated.

        2.     The use of solvent based paints and coatings will not be permitted.

        3.     The number of coats are to be as required by the material supplier to give a
               uniform colour as specified.

        4.     Water vapour permeability is to be less than 2 metres (air equivalent layers).

        5.     Resistance to carbon dioxide diffusion is to be greater than 50 metres (air
               equivalent layers).

        6.     The surface coatings are to remain permanently flexible and elastomeric such
               that the hair line cracks up to and including a width of 1.0 mm both existing
               and those developing in the concrete after the coating has been applied will
               remain permanently bridged.

        7.     The treatments specified above should provide protection to structural
               elements subject to de-icing salts, etc where used adjacent to roadways and
               pavements.

        8.     Verification must be supplied by the material suppliers that the surface
               protection provided will maintain the above requirements for a minimum of
               10 years without further applications.

       9.      2000 hours accelerated weathering test certificate by Taylor Woodrow
               Laboratories or a similar approved laboratory.

3.11    Decorative and Protective Coatings

        b)     To surfaces permanently covered by overcladding (where applicable).

3.12    Surface Preparation

        Apply pore filler surface stabiliser or primer as required by and compatible with the
        final treatment.

3.13    Treatment

        Apply 2 No coats of a bituminous paint to a total minimum dry film thickness of
        100 microns.




HSG 3657C                                    D/6
4.00   CONCRETE FLOOR REPLACEMENT

4.01   Break out and remove the existing concrete floor slabs.

4.02   Remove all fill below the slab down to at least external ground level. If necessary,
       extend the excavation of any fill materials to wholly remove any red shale, broken
       plaster and any other perishable materials.

4.03   Excavate further and cast 450 x 150 deep concrete foundation for a honeycomb
       sleeper wall central in the lounge (position to be confirmed on site).

4.04   If necessary, re-build levels up to external ground level in compacted clean broken
       limestone, then cast over-site concrete.

4.05   Build sleeper wall, finish with damp proof course and 100 x 75 mm wall plate.

4.06   Provide air bricks to external walls to ventilate floor void.

4.07   Provide tanalised timber joists grade SC3, size and layout to be agreed by Project
       Manager and comply with current Building Regulations. Extra trimmer joists may be
       required for the stairs. If the joists are to be built into pockets in the external wall
       they should have a minimum of 90 mm bearing and be protected by a damp proof
       course. Alternatively, the joists could be supported on joist hangers - Catnic TWBS
       38/175 or similar, in which case the ends of joists should be nailed to the hangers with
       3.75 x 30 square twisted nails and plugged and screwed to the wall in addition to
       vertical support.

4.08   Provide and fix 22 mm floorboards or flooring grade chipboard, after providing any
       insulation required.

4.09   Provide skirting and make good general finishings, etc.

4.10   Work should generally be in accordance with the current Building Regulations.

5.00   SPALLING BRICKWORK

5.01   Investigations should be undertaken to determine the cause of the spalling. Particular
       attention should be paid to investigating the presence of sulphate attack and freeze/
       thaw action. The replacement brickwork and mortar should be selected with due
       regard to the inherent problems i.e. frost resistant brick and/or sulphate resistant
       mortar.

5.02   Remedials should be undertaken to remove/deal with the root cause of the problem
       prior to the replacement of the brickwork.




HSG 3657C                                     D/7
5.03   Any affected brickwork should be carefully removed and replaced with bricks and
       mortar of similar strength texture and colour to the originals. Further investigations
       should be undertaken if the replacement brickwork require amounts to be greater than
       5% or 2 sq. m., whichever is the least.

5.04   In cavity walls, any brickwork area greater than 0.25 sq. m., should be tied into the
       inner leaf using remedial ties as directed in the relevant sections of this specification.

5.05   Cavities should be inspected and cleared as necessary of any deleterious materials and
       blockages.




HSG 3657C                                     D/8

				
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