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Building Regulations Specifications - Examples

Here are some examples of our Building Regulations Specifications.

Note: each of these notes is incomplete. Please register here to use our full Building Regulations Specs.

Strip Foundation

STRIP FOUNDATION Provide 225mm x 600mm concrete foundation, concrete mix to conform to BS EN 206-1 and BS 8500-2. All foundations to be a minimum of 1000mm below ground level, exact depth to be agreed on site with Building Control Officer to suit site conditions. All constructed in accordance with 2004 Building Regulations A1/2 and BS 8004:1986 Code of Practice for Foundations. Ensure foundations are constructed below invert level of any adjacent drains. Base of foundations supporting internal walls to be.....register here for our full specifications and web apps.

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Solid Ground Floor (Insulation Over Slab)

SOLID FLOOR INSULATION OVER SLAB To meet min U value required of 0.22 W/m²K Solid ground floor to consist of 150mm consolidated well-rammed hardcore. Blinded with 50mm sand blinding. Provide 100mm ST2 or Gen2 ground bearing slab concrete mix to conform to BS 8500-2 over a 1200mm gauge polythene DPM, DPM to be lapped in with DPC in walls. Floor to be insulated over a VCL on slab with min 100mm thick Celotex GA4000. 25mm insulation to continue around floor perimeters to avoid thermal bridging. A VCL should be laid over the insulation boards and turned up 100mm at room perimeters behind the skirting, all joints to be.....register here for our full specifications and web apps.

Timber Suspended Floor

TIMBER SUSPENDED FLOOR Ground preparation - Remove top soil and vegetation, apply total weed killer and 150mm min thick sand blinded hardcore, then either – (i) Provide concrete ground cover of at least 100mm thick or (ii) Prepare the ground to an even surface and lay a ground cover of concrete at least 50mm thick, on a damp-proof membrane of at least 1200 gauge polyethylene, laid on a bed of fine sand blinding. Floor construction - min 20mm tongue and groove softwood boards or moisture resistant particle/chipboard grade type C4 to BS EN 312:2010 as required. Lay with staggered joints on 47mm x 100mm C24 grade soft wood joists at maximum 400mm centres max span 2.10m. Joists to be supported off proprietary galvanized joist hangers built into new masonry walls or fixed to treated timber wall plates resin bolted to walls at 600mm centres. If required, floor joists also to be.....register here for our full specifications and web apps.

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Block and Beam Floor

SUSPENDED BLOCK AND BEAM FLOOR Remove top soil and vegetation, apply weed killer – The underside of beams not less than 150mm above the top of the ground. PCC beams to be supplied and fixed to beam manufacturer's plan, layout and details (details and calculations to be sent to Building Control and approved before works commence). Minimum bearing 100mm onto DPC and load bearing walls. Provide concrete blocks to BS6073 pt.1, wet and grout all joints with 1:4 cement/sand mix. Provide double beams below non-load bearing partitions. Lay 1200g DPM/radon barrier, with 300mm laps double welted and taped at joints and service entry points using radon gas proof tape, over beam and block floor. Lay floor insulation over DPM, 75mm Celotex GA4000 applied as a rigid material. Lay 500g separating layer over insulation and provide 75mm sand/cement screed over and prepare for.....register here for our full specifications and web apps.

Solid External Wall

SOLID EXTERNAL WALL To achieve min U-value 0.28W/m²K Wall constructed using lightweight aggregate or aerated concrete block, r value 0.15, at least 215mm thick, eg. Topblock Supabloc or Celcon Solar. Rake out joints in the wall to a depth of at least 10mm and apply two coats of render at least 20mm thick with a scraped or textured finish. The rendering mix to comply to.....register here for our full specifications and web apps.

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Cavity Wall (Full Fill)

FULL FILL CAVITY WALL To achieve minimum U Value of 0.28W/m²K 20mm two coat sand/cement render to comply to BS EN 13914-1:2005 with waterproof additive on 100mm lightweight block, K value 0.16, (Aircrete, Celcon solar, Topblock Toplite Standard). Fully fill the cavity with 85mm Isowool Hi-Cav 32 cavity insulation as manufacturer's details. Inner leaf to be.....register here for our full specifications and web apps.

Timber Frame Wall

TIMBER FRAME WALL To achieve minimum U Value of 0.28W/m²K 102mm facing brick to match existing with 50mm vented and drained cavity tied to breathable membrane (having a vapour resistance of not more than 0.6 MNs/g) and 12mm thick WBP external quality plywood sheathing (or other approved). Ply fixed to treated timber frame studs constructed using 150mm x 50mm treated timbers with head & sole plates and vertical studs (with noggins) at 400mm ctrs, or to s/engineer's details & calculations. Insulation to be 70mm Kingspan K12 framing board between studs with.....register here for our full specifications and web apps.

Solid Brick Wall, External Insulation

SOLID BRICK WALL WITH EXTERNAL INSULATION U value 0.28 Mechanically fix 60mm Kingspan Kooltherm K5 external wall board to 215mm solid brick wall built using 1:1:6 cement mortar. Insulation boards to be fixed using thermally broken proprietary telescopic tube fasteners at max 1m centres driven into pre-drilled holes, ensure a minimum of 5 fixings per insulation board. Apply 20mm of suitable reinforced render with.....register here for our full specifications and web apps.

Ventilated Flat Roof

VENTILATED FLAT ROOF (imposed load max 1.0 kN/m² - dead load max 0.75 kN/m²) To achieve U value of 0.18 W/m²K Flat roof to be single ply membrane roofing with aa fire rating as specialist specification, with a current BBA or WIMLAS Certificate on 22mm exterior grade plywood, laid on firrings to give a 1:40 fall on 47 x 145mm grade C24 timber joists at 400 ctrs max span 3.22m (see engineer's details for sizes). Cross-ventilation to be provided on opposing sides by a proprietary eaves ventilation strip to give 25mm continuous ventilation, with fly proof screen. Flat roof insulation is to be continuous with the wall insulation but stopped back to allow a continuous 50mm air gap above the insulation for ventilation. Insulation to be.....register here for our full specifications and web apps.

Warm Flat Roof

WARM FLAT ROOF (imposed load max 1.0 kN/m² - dead load max 0.75 kN/m²) To achieve U value 0.18 W/m²K 12.5mm spa solar reflective chippings to achieve aa designated fire rating for surface spread of flame bedded in bitumen on three layer felt to BS 6229:2003 laid on 22mm external quality ply over 125mm Celotex TA4000 insulation. Insulation bonded to 22mm exterior grade plywood on firrings to give 1:60 fall on 47 x 145mm C24 timber joists at.....register here for our full specifications and web apps.

Pitched Roof (Ceiling Level Insulation)

PITCHED ROOF INSULATION AT CEILING LEVEL Pitch 22-45° (imposed load max 0.75 kN/m² - dead load max 0.75 kN/m²) To achieve U value of 0.16 W/m²K Timber roof structures to be designed by an Engineer in accordance with NHBC Technical Requirement R5 Structural Design. Calculations to be based on BS EN 1995-1-1. Roofing tiles to match existing on 25 x 38mm tanalised sw treated battens on sarking felt supported on 47 x 100mm grade C24 rafters at max 400mm centres max span 2.12m. Rafters supported on 100 x 50mm sw wall plates. Insulation at ceiling level to be 100mm GA4000 Celotex between ceiling joists with a further 75mm over joists. Construct ceiling using sw joists at 400mm centres, finished internally with 12.5mm plasterboard and min 3mm thistle multi-finish plaster. Provide polythene vapour barrier between insulation and plasterboard. Provide opening at eaves level at least equal to.....register here for our full specifications and web apps.

Pitched Roof (Unvented)

UNVENTED PITCHED ROOF Pitch 22-45° (imposed load max 0.75 kN/m² - dead load max 0.75 kN/m²) To achieve U-value 0.18 W/m²K Timber roof structures to be designed by an Engineer in accordance with NHBC Technical Requirement R5 Structural Design. Calculations to be based on BS EN 1995-1-1. Roofing tiles to match existing on 25 x 38mm tanalised sw treated battens on breathable sarking felt to relevant BBA Certificate. Supported on 47 x 100mm grade C24 rafters at max 400mm centres max span 2.12m. Rafters supported on 100 x 50mm treated sw wall plates. Allow min 20mm air space to allow for drape of breathable felt. Insulation to be 80mm Celotex GA4000 between rafters and 62.5mm Celotex PL4000 insulated plasterboard with VCL under rafters. Provide 5mm skim coat of.....register here for our full specifications and web apps.

Stairs

STAIRS Dimensions to be checked and measured on site prior to fabrication of stairs. Timber stairs to comply with BS585 and with Part K of the Building Regulations. Max rise 220mm, min going 220mm. Two risers plus one going should be between 550 and 700mm. Tapered treads to have going in centre of tread at least the same as the going on the straight. Min 50mm going of tapered treads measured at narrow end. Pitch not to exceed 42 degrees. The width and length of every landing should be at least as great as.....register here for our full specifications and web apps.

Extract Ventilation, Utility Room

EXTRACT TO UTILITY ROOM To utility room provide mechanical ventilation ducted to external air capable of extracting at a rate of 30 litres per second. Internal doors should be provided with a 10mm gap below the door to aid air circulation. Ventilation provision in accordance with.....register here for our full specifications and web apps.

Drainage (Above Ground)

ABOVE GROUND DRAINAGE All new above ground drainage and plumbing to comply with BS EN 12056-2:2000 for sanitary pipework. All drainage to be in accordance with Part H of the Building Regulations. Wastes to have 75mm deep anti vac bottle traps and rodding eyes to be provided at changes of direction. Size of wastes pipes and max length of branch connections (if max length is exceeded then anti vacuum traps to be.....register here for our full specifications and web apps.

Tanking

TANKED PROTECTION Sika® Damp-proofing Slurry polymer - cement based waterproofing system. Type A waterproofing in accordance with BS 8102: 1990 to give a protection level of grade 3 (suitable for concrete, renders, brickwork and blockwork structures as detailed in BBA certificate). Ensure that all materials and products are compatible. Assess structure for suitability of tanking system and ensure substructure is free draining. The concrete surface must be examined for defects and repaired in accordance with manufacturer's details if required. All retaining elements are to be detailed by a Structural Engineer. All materials and products should be installed by.....register here for our full specifications and web apps.

Pitched Roof (Vented)

PITCHED ROOF Vented roof – pitch 22-45° To achieve U-value 0.18 W/m²K Timber roof structures to be designed by an Engineer in accordance with NHBC Technical Requirement R5 Structural Design. Calculations to be based on BS EN 1995-1-1. Roofing tiles to match existing on 25 x 38mm tanalised sw treated battens on sarking felt to relevant BBA Certificate. Supported on 47 x 220mm grade C24 rafters at max 400mm centres span to engineer's details and calculations. Rafters supported on 100 x 50mm sw wall plates. Insulation to be 125 Xtratherm Thin-R between and 25 under rafters. Maintain a 50mm air gap above insulation to ventilate roof. Provide opening at eaves level at least equal to.....register here for our full specifications and web apps.

Cavity Wall (Partial Fill)

PARTIAL FILL CAVITY WALL To achieve minimum U Value of 0.28W/m²K Provide 103mm facing brick to match existing construction. 50mm clear residual cavity, 60mm Celotex CW4000 insulation fixed to.....register here for our full specifications and web apps.

Solid Ground Floor (Insulation Under Slab)

SOLID FLOOR INSULATION UNDER SLAB To meet min U value required of 0.22 W/m²K Solid ground floor to consist of 150mm consolidated well-rammed hardcore. Blinded with 50mm sand blinding. Provide a 1200mm gauge polythene DPM, DPM to be lapped in with DPC in walls. Floor to be insulated over DPM with 100mm Knauf Polyfoam Floorboard Standard. 25mm insulation to continue around floor perimeters to avoid thermal bridging. A VCL should be laid over the insulation boards and turned up 100mm at room perimeters behind the skirting, all joints to be lapped 150mm and sealed. Provide 100mm ST2 or Gen2 ground bearing slab concrete mix to conform to.....register here for our full specifications and web apps.

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A Step beyond Building Regulations Guidance for Building Control Plans in England and Wales
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