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).