PITCHED ROOF FINISH

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					PITCHED ROOF FINISH

Existing stone slate roof to be carefully removed. All sound slates to be set aside for re-use. Take extra care
with angled ridges. All rafters to be cleaned.

Existing roof, and roof to new extension to be finished with salvaged and matching new thin natural cotswold
stone slates. Suitable thin slates available from:

        STANWAY SLATE COMPANY LTD
        Stanway House, Stanway, Cheltenham, GL54 5PQ, Tel. 01386 584469

        COTSWOLD STONE AND TILE LTD
        Crucis Park Farm, Ampney Crucis, Cirencester, GL7 5DX, Tel. 07795 094735

Slates to be laid and fixed in accordance with BS 5534: Part 1: 1978 Slating & Tiling. Fix slates with slate or clout
nails, aluminium, copper, or silicon-bronze to BS 1202, to treated 50 x 25 s.w. battens, fixed to 19 x 38 counter
battens on TLX Gold breathable insulated roofing underlay all in accordance with manufacturers instructions:

        TLX Gold is rolled taut across the rafters in horizontal layers parallel to the eaves, starting at the eaves.
        The membrane overlap on the lowest layer of TLX Gold should extend onto and adhered to a suitable
        eaves carrier. Additional breather membrane may be used to cover the gaps between TLX Gold and the
        eaves carrier if required. As TLX Gold is unrolled across the rafters it is fixed in place with nails or
        staples of at least 14mm length. The next layer of TLX Gold must butt-join the previous layer, with the
        membrane overlap running onto the lower layer, thus ensuring that any water runs down the roof slope
        without penetrating between layers. Vertical overlaps should be a minimum of 50mm. TLX Gold is
        permanently held in place with 25mm deep counter battens, then tiling battens and tiles are fitted. The
        counter battens should hold the layers of TLX Gold in close contact, if there is any doubt then the overlap
        should be taped with a suitable double or single sided tape.

Form ridge to existing building with salvaged angled ridge units edge bedded onto slates, with solid bedding at
butt joints. Form ridge to new extension with matching reconstituted stone angled ridge tiles edge bedded onto
slates, with solid bedding at butt joints.

Form abutments at existing gable parapets: Code 4 lead soakers in slating, with Code 5 lead flashing wedged
under existing stone coping, and dressed over slating.

Form verge to gable of new extension: top corner of slates dressed to a curve, slates to project approx. 75mm,
slates to be pointed with mortar brushed back so edge of slates project approx.12mm.

Form valley with cut slates to a tight joint over a code 5 lead valley on 25mm WBP plywood.


ROOF CONSTRUCTION

All softwood structural carcassing timber to be pressure impregnated.

Roof to New Extension
3x50x90 galv. m.s. tension straps to gable walls.
100x50 s.w. wall plates on top of concrete block inner skin. 3x50x90 galv. m.s. vertical straps at max. 2m centres.
C24 grade 200x25 s.w. ridge board.
C24 grade 150x50 s.w. rafters @ 400 centres
C24 grade 100x50 s.w. ceiling joist/ties
Form trimming for attic access as indicated.
ROOF INSULATION

TLX Silver to be fixed under existing rafters in existing building, and under ceiling joists in new extension in
accordance with manufacturers instructions:

        Silver is unrolled above or below the rafters and ceiling joists in horizontal layers, parallel to the eaves.
        The product should be installed from ridge to eaves, and over- or under-lapped to ensure that any water
        inside the rafter space runs down and does not penetrate the insulation or the rafter space. As the Silver
        is unrolled across the rafters it is fixed in place using nails or staples of at least 14mm depth. The next roll
        of Silver must overlap the preceding layer by at least 50mm, and the overlap should be sealed along the
        entire length using the specified adhesive tape.

        When installing Silver, try to retain the full width (with two seams) whenever possible. For the bottom
        layer, it is better to use a complete layer, and increase the overlap with the next layer up, rather than
        cutting along the Silver to maintain a 50mm overlap.
        Silver should be permanently held in place using 25mm wooden battens fixed with nails. Battens may run
        either parallel or perpendicular to the rafters.
        Any tears or holes should be repaired with the specified adhesive tape.
        It is important that Silver is securely taped at overlaps and junctions with walls or windows. TLX tape or
        Henkel All-Purpose Duck tape are recommended as a suitable tape. Other tapes should not be used
        unless they have been shown to have equivalent bonding to Duck tape.
        Silver must always be taped together when the surfaces are clean and dry.



EXTERNAL WALLS

Walls to Existing Building
Existing waney edged boarding to be carefully removed and set aside for reuse.

Inner leaf: 100mm 7N/sq.mm.lightweight aggregate concrete block work. (Hansons Fenlite or similar.) Form
splays to window and door openings with sawn Thermalite (or similar lightweight insulating blocks) as drawn.
Cavity: 50x25 sw battens plugged and screwed to blockwork. TLX Gold breathable insulation fixed with fixed to
25x50 sw battens. TLX Gold is rolled taut across battens in horizontal layers parallel to the eaves, starting at the
bottom of wall. As TLX Gold is unrolled across the battens it is fixed in place with nails or staples of at least
14mm length. The next layer of TLX Gold must butt-join the previous layer, with the membrane overlap running
onto the lower layer, thus ensuring that any water runs down without penetrating between layers. Vertical
overlaps should be a minimum of 50mm. TLX Gold is permanently held in place with 25mm deep counter
battens. The counter battens should hold the layers of TLX Gold in close contact, if there is any doubt then the
overlap should be taped with a suitable double or single sided tape.
Outer finish: Salvaged and matching waney edged elm boarding, lapped and fixed with secret nailing to battens


Walls to Extension
Inner leaf: 100mm 7N/sq.mm.lightweight aggregate concrete block work. (Hansons Fenlite or similar.) Form
splays to window and door openings with sawn Thermalite (or similar lightweight insulating blocks) as drawn.
Cavity: 100mm cavity with 100mm Jabfill Premium cavity insulation, (available from Vencel Resin Lydney 01594
566400). Cavities to be closed at sills, jambs and heads of all openings with appropriate Polyfoam Plus system
closer. Cavity tray above all openings. Cavity tray at all abutments, including chimneys, stepped as necessary to
line of sloping roofs. Trays to finish above Code 5 lead flashings. DPC to be pitch polymer. Stainless steel wall
ties at 450 c/c vertically and 750 c/c horizontally, staggered, doubled up at openings.
Inner leaf (2): 100mm Thermalite blockwork (or similar lightweight insulating blocks).
Outer leaf: Random coursed 125mm natural limestone, to approved sample 1m panel. In cement/lime/sand
mortar finished with a bagged joint. Horizontal DPC 150mm above finished ground level. DPCs to be pitch
polymer.
Lintels
Internal skin   150x100 precast concrete. 100 min. end bearing
Cavity          Form cavity tray
IG lintels      IG ref: L1/S WOL 100, galvanised steel insulated lintels supplied to required length with 150mm
                min. end bearing and required depth to suit span. Cavity tray over.


GROUND FLOOR CONSTRUCTION

Existing Building
75mm sand/cement screed on 75mm Styrofoam ‘Floormate 700’ on BS 1521 grade B/F building paper laid on hot
applied bitumen DPM on concrete oversite slab. Reinforced concrete oversite slab 150mm thick to engineers
design with turned up edge to support existing wall, on 25mm sand blinding.

Extension
75mm sand/cement screed on 75mm Styrofoam ‘Floormate 700’ on BS 1521 grade B/F building paper laid on
concrete oversite slab. 1:2:4 mix concrete oversite slab 150mm thick, on 1200 gauge polythene sheet (DPM), on
25mm sand blinding.


FOUNDATIONS

Extension
Trench fill footings 600mm wide, 1:3:6 mix, 1000mm deep to underside from finished ground level, precise depth
to be agreed on site with LA Building Inspector. Blocks up to DPC level to be dense concrete blocks, natural
aggregate terminated 150mm below ground level of outer skin. Cavities to be filled with weak concrete mix up to
150mm below DPC, and level finished with outward slope.


INTERNAL WALLS

100mm 7N/sq.mm.lightweight aggregate concrete block work. (Hansons Fenlite or similar


WALL FINISHES: INTERNAL

Concrete block: cement and sand render with skim coat of thistle finishing plaster.


CEILING FINISHES

12.5mm foil backed plasterboard fixed to 50x25 treated sw battens, and finished with a skim coating of thistle
finish


WINDOW & DOOR FRAMES

Traditional painted hardwood casement windows, double glazed (to achieve a min. ‘U’ value of 2.0W/m2K.)
Schlegel or similar weather-strip to all opening lights. Frames set back 75 mm from face of stonework.
Openable areas to be minimum 1/20th of floor area of room served. Vertical DPC at jambs. All glazing below
1500mm to be toughened or laminated safety glass. Any glazing that is within 800mm of the floor level, or is in a
door, or within 300mm of the side of a door, and within 1500mm of the floor level shall be safety glazing or
guarded.


VENTILATION OF HABITABLE ROOMS

For rapid ventilation, one or more ventilation openings with a total area of at least 1/20th of the floor area of the
room, and with some part of the ventilation opening at least 1.75m above floor level.
For background ventilation, provide 75,000 sq.mm total to be provided approximately evenly distributed between
openings. The openings should be controllable and secure and located as to avoid undue draughts. The
ventilation opening should be reasonably secure, adjustable and located at a height of 1.75m above floor level, so
as to avoid discomfort due to cold draughts and to prevent rain ingress. To encourage cross ventilation all doors
to be undercut 10mm.


HEATING

Electrical underfloor system to be installed in ground floor screed.         System to be controlled with zoned
thermostats.

5kw woodburning stove in living room on stone hearth.


VENTILATION

Kitchen
Mechanical fan capable of extracting min. of 30 litres per second if positioned above hob, or 60 litres per second
if located elsewhere, in addition to the openable ventilation.

Sanitary Accomodation
Provide mechanical fan capable of extracting min. of 30 litres per second, with 15 minutes overrun, (in addition to
the openable ventilation if provided). In rooms with no natural light the fan should be controlled by the operation
of the main room light switch


RAINWATER GOODS

Rainwater gutters to be 100mm half round powder coated cast aluminium supported on purpose made brackets.
Down pipes to be 75mm round terminating in rainwater shoe over rainwater gully. All fixings to be non-ferrous



PLUMBING

Basins to have 40mm dia. PVC wastes. WC connections 100mm dia. PVC waste. Basin wastes to connect to
SVP 200mm below WC connection. To prevent water seals in traps being lost, anti-siphon traps to be fitted to all
appliances

SVP stubstack to terminate 1m above nearest fitting with 'Durgo' one-way valve. Internal SVP’s to be surrounded
in sound absorbent material and cased in 12.5mm plasterboard boxing. If the stub stacks are sited within a duct,
adequate ventilation and an access point will be provided.
All sanitary pipe work and traps to be accessible for repair and maintenance, and to be fitted with cleaning eyes
and rodding points to give access to all pipes and traps, where such access cannot be gained by removal of
fittings.


DRAINAGE

100mm drainage runs to discharge into new packaged sewage treatment plant via new manholes and inspection
chambers as drawn. Rainwater and surface water to connect to existing system. All new drainage runs to be in
100mm diameter Osma UPVC underground pipes, laid to correct falls and levels. Osma fittings to be used as
necessary, utilising access chambers, and PPIC inspection chambers. All new pipe work below ground to be laid
on and surrounded in min. 150mm pea gravel.

Adequate provision and access to be made for the storage and collection of solid waste.


FIRE PRECAUTIONS

Provide interlinked automatic smoke detection in accordance with the relevant recommendations of BS5839: Part
1, to Grade D at least Category LD2 standard, they should be provided with a suitable number of mains operated
self-contained smoke alarms which conform to BS5466:Part 1, installed in accordance with Part B of the Building
Regulations. Smoke alarms to be provided: to kitchen, and tasting room. The smoke alarms may be wholly
mains operated or mains operated with a secondary power supply such as batteries. Smoke alarms operated by
primary batteries are not acceptable.

On completion sufficient information will be provided to the eventual owners and occupiers of the dwelling to
ensure they operate, maintain and use the building in reasonable safety.


PART J – HEAT PRODUCING/COMBUSTION APPLIANCES

Provide permanent combustion air for woodburning stove (total free area to be at least 50% of the flue area. Air
to be provided by hit and miss grills in the hearth connected to pipework below ground floor slab with periscope
and buff coloured air brick vent in external wall.

Identification plate to include information required under Statutory Regulations: Part J: Appendix A.

Flue to woodburning stove to be double skin insulated stainless steel.


PART L1 – CONSERVATION OF FUEL AND POWER IN DWELLINGS

Provide a low energy light fitting in at least three rooms.


PART M – DISABLED ACCESS

All sockets and switches to be between a height of 450mm and 1200mm. Provide level access of smooth and
stable construction from parking area to door with level threshold. Ground floor WC compartment to comply with
the requirements of Paragraph 10.3 and Diagram 32 of Approved Document M (M1/M4).
PART P - ELECTRICAL SAFETY

All electrical installation work within a dwelling to be considered as a ‘controlled service’. Works to be carried out
and certified as being in compliance with the regulations by a competent person to satisfy the requirement the
installer is required to be registered with an electrical self-certification scheme authorized by The Secretary of
State. Contractor to be registered with Elecsa Ltd, NICEIC, NAPIT, BRE or BSI. Where electrical works are
carried out under the self certification scheme the person certifying compliance must notify Building Control within
30 days of completion of the works.

If downlighters are to be installed in ceiling/roof voids insulated with mineral wool insulation, good practice
dictates that an air space is provided to dissipate heat from the luminaire. This can be achieved by installing a
cage or box above the downlighter.

Downlighters must also comply, where applicable, with Part B and Part E of the Building Regulations. Fire and/or
acoustic hoods to be fitted to ensure that fire resistance and sound insulation requirements are maintained. Care
should also be taken to avoid interstitial condensation occurring (Part C).

				
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