Building Regs Specifications and Detail Drawings
Specifications
Wales
November 2022
changes
Wales
November 2022
changes
Specifications
England
June 2022
changes
England
June 2022
changes
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Beyond Guidance
Benefits of using BuildingRegs4Plans
Creating the list of Building Notes for Building Plans can be a long-winded task. The App on our site takes the hard work out of this essential part of Drawing Plans, going a step beyond guidance with pre-prepared construction notes and easy-to-use menus so that you can add Building Regs Notes as you need them.
Site features:
- Access to our Building Notes.
- Carefully prepared Building Notes written by Building Control Professionals.
- Categorised Building Regs notes within our slick App, allowing you to easily find the specifications that you want.
- Wide range of notes for different specifications eg for different rafter sizes, spans etc.
- An edit function to edit notes where you cannot find one to met your exact requirements.
- Compilation of Building Regulations Notes into a single Construction Specification / Note-List that can be copied and pasted into your CAD drawing-program.
- Building Regs Specs for House Extensions, Loft and Garage Conversions.
- Very Fast Website, optimised for speed. The App updates according to your choices, in milliseconds. Try it and see!
- Building Regs Notes that take into account the October 2010 changes to UK Building Regulations (England and Wales).
- The Specs are applicable to work undertaken in England & Wales only.
- Specially prepared Construction Detail Drawings available in AutoCAD-native DWG and JPEG formats (drawings available for purchase but entirely optional).
- Tested in most current version of common browsers including Edge, Internet Explorer, Mozilla Firefox, Google Chrome and Safari.
The App enables you to complete your whole note-list / specification but alternatively you may just come to grab individual notes as needed.
Sample Building Notes
Note: There are hundreds of Building Regulations Specifications (compiled by Building Control Professionals) on our Building Regs Apps for Extensions, Loft and Garage Connversions. Please Register Here for commercial use of all of the Apps including Loft and Garage Conversions. Checkout the Extensions App here.
STRIP FOUNDATION
Provide 225mm x 600mm concrete foundation, concrete mix to conform to BS EN 206:2013 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 2010 Building Regulations A1/2 and BS 8004:2015 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.
Provide 225mm x 600mm concrete foundation, concrete mix to conform to BS EN 206:2013 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 2010 Building Regulations A1/2 and BS 8004:2015 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.
Many more Building Regs Specs for extension foundations here.
DPC
Provide horizontal strip polymer (hyload) damp proof course to both leafs minimum 150mm above external ground level.
New DPC to be made continuous with .....register here for our full specifications and web apps.
Provide horizontal strip polymer (hyload) damp proof course to both leafs minimum 150mm above external ground level.
New DPC to be made continuous with .....register here for our full specifications and web apps.
WARM FLAT ROOF
(imposed load max 1.0 kN/m² - dead load max 0.75 kN/m²)
To achieve U value 0.15 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 laid on 18mm external quality ply (ply optional, see manufacturer's details) over 150mm Celotex XR4000 insulation.
Insulation bonded to VCL fixed to 18mm exterior grade plywood on firrings to give 1:40 fall on 47 x 145mm C24 timber joists at 400 ctrs to give a max span of 3.22m (see Engineer's details for sizes).
Ceiling construction to be 12.5mm plasterboard over vapour barrier with skim plaster finish.
Provide restraint to.....register here for our full specifications and web apps.
(imposed load max 1.0 kN/m² - dead load max 0.75 kN/m²)
To achieve U value 0.15 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 laid on 18mm external quality ply (ply optional, see manufacturer's details) over 150mm Celotex XR4000 insulation.
Insulation bonded to VCL fixed to 18mm exterior grade plywood on firrings to give 1:40 fall on 47 x 145mm C24 timber joists at 400 ctrs to give a max span of 3.22m (see Engineer's details for sizes).
Ceiling construction to be 12.5mm plasterboard over vapour barrier with skim plaster finish.
Provide restraint to.....register here for our full specifications and web apps.
Many more Building Regs Specs for extension roofs here.
EXTRACT TO KITCHEN
Kitchen to have mechanical ventilation with an extract rating of 60 l/s, or 30 l/s if adjacent to hob to external air.
Internal doors should be provided with a 10mm gap below the door to aid air circulation.
Ventilation provision in accordance with the Domestic Ventilation Compliance Guide. Intermittent extract fans to BS EN 13141-4.
Cooker hoods to BS EN 13141-3......register here for our full specifications and web apps.
Kitchen to have mechanical ventilation with an extract rating of 60 l/s, or 30 l/s if adjacent to hob to external air.
Internal doors should be provided with a 10mm gap below the door to aid air circulation.
Ventilation provision in accordance with the Domestic Ventilation Compliance Guide. Intermittent extract fans to BS EN 13141-4.
Cooker hoods to BS EN 13141-3......register here for our full specifications and web apps.
NEW AND REPLACEMENT WINDOWS
New and replacement windows to be double glazed with 16-20mm argon gap and soft coat low-E glass.
Window Energy Rating to be Band B or better and to achieve U-value of 1.4 W/m²K.
The door and window openings should be limited to 25% of the extension floor area plus the area of any existing openings covered by the extension.
Insulated plasterboard to be used in reveals to abut jambs and to be considered within reveal soffits.
Fully insulated and continuous cavity closers to be......register here for our full specifications and web apps.
New and replacement windows to be double glazed with 16-20mm argon gap and soft coat low-E glass.
Window Energy Rating to be Band B or better and to achieve U-value of 1.4 W/m²K.
The door and window openings should be limited to 25% of the extension floor area plus the area of any existing openings covered by the extension.
Insulated plasterboard to be used in reveals to abut jambs and to be considered within reveal soffits.
Fully insulated and continuous cavity closers to be......register here for our full specifications and web apps.
INTERMEDIATE FLOORS
Intermediate floor to be 25mm t&g flooring grade chipboard or floorboards laid on C24 joists at 400mm ctrs (see Engineer's calculation for sizes and details).
Lay 100mm Rockwool mineral fibre quilt insulation min 10kg/m³ or equivalent between floor joists.
Ceiling to be 12.5 Fire-Line plasterboard with skim plaster set and finish.
Joist spans over 2.5m to be strutted at mid span using 38 x 38mm herringbone strutting or 38mm solid strutting (at least 2/3 of joist depth).
In areas such as kitchens, utility rooms and bathrooms, flooring to be moisture resistant grade in accordance with BS EN 312.
Identification marking must be laid upper most to allow......register here for our full specifications and web apps.
Intermediate floor to be 25mm t&g flooring grade chipboard or floorboards laid on C24 joists at 400mm ctrs (see Engineer's calculation for sizes and details).
Lay 100mm Rockwool mineral fibre quilt insulation min 10kg/m³ or equivalent between floor joists.
Ceiling to be 12.5 Fire-Line plasterboard with skim plaster set and finish.
Joist spans over 2.5m to be strutted at mid span using 38 x 38mm herringbone strutting or 38mm solid strutting (at least 2/3 of joist depth).
In areas such as kitchens, utility rooms and bathrooms, flooring to be moisture resistant grade in accordance with BS EN 312.
Identification marking must be laid upper most to allow......register here for our full specifications and web apps.
SUSPENDED BLOCK AND BEAM FLOOR
To meet min U value required of 0.18 W/m²K
Remove top soil and vegetation and apply weed killer – provide 50mm concrete ground cover if required by BCO.
The underside of beams to be 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 for approval before works commence). Beam to have a minimum bearing of 100mm onto DPC and load bearing walls.
Provide concrete blocks to BS EN 772-2, wet and grout all joints with 1:4 cement/sand mix. Provide double beams below non-load bearing partitions.
Lay 1200g DPM/radon barrier over beam and block floor, with 300mm laps double welted and taped at joints and service entry points using radon gas proof tape.
Lay floor insulation over DPM, 90mm Celotex GA4000 applied as a rigid material. 25mm insulation to continue around floor perimeters to avoid thermal bridging.
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.
To meet min U value required of 0.18 W/m²K
Remove top soil and vegetation and apply weed killer – provide 50mm concrete ground cover if required by BCO.
The underside of beams to be 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 for approval before works commence). Beam to have a minimum bearing of 100mm onto DPC and load bearing walls.
Provide concrete blocks to BS EN 772-2, wet and grout all joints with 1:4 cement/sand mix. Provide double beams below non-load bearing partitions.
Lay 1200g DPM/radon barrier over beam and block floor, with 300mm laps double welted and taped at joints and service entry points using radon gas proof tape.
Lay floor insulation over DPM, 90mm Celotex GA4000 applied as a rigid material. 25mm insulation to continue around floor perimeters to avoid thermal bridging.
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.
Many more Building Regs Specs for extension floors here.
WARM PITCHED ROOF
Pitch 22-45° (imposed load max 0.75 kN/m² - dead load max 0.75 kN/m²)
To achieve min U-value required of 0.15 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 1995-1-1:2004 Eurocode 5: Design of timber structures.
Roofing tiles to match existing fixed to tile battens secured over breathable felt to relevant BBA Certificate allowing the breather felt to sag at least 10mm over preservative-treated counter battens (min 38mm x 50mm).
Provide 100mm Celotex GA4000 insulation boards under the counter battens and 40mm Celotex TB4000 between 47 x 100mm timber rafters strength class C24 at 400 c/c – to give a max 2.12m span.
A vapour control layer should be provided to the underside of the rafters. Finish with 12.5mm plasterboard and skim.
Restraint strapping - Ceiling joists tied to.....register here for our full specifications and web apps.
Pitch 22-45° (imposed load max 0.75 kN/m² - dead load max 0.75 kN/m²)
To achieve min U-value required of 0.15 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 1995-1-1:2004 Eurocode 5: Design of timber structures.
Roofing tiles to match existing fixed to tile battens secured over breathable felt to relevant BBA Certificate allowing the breather felt to sag at least 10mm over preservative-treated counter battens (min 38mm x 50mm).
Provide 100mm Celotex GA4000 insulation boards under the counter battens and 40mm Celotex TB4000 between 47 x 100mm timber rafters strength class C24 at 400 c/c – to give a max 2.12m span.
A vapour control layer should be provided to the underside of the rafters. Finish with 12.5mm plasterboard and skim.
Restraint strapping - Ceiling joists tied to.....register here for our full specifications and web apps.
PARTIAL FILL CAVITY WALL
To achieve minimum U Value of 0.18 W/m²K
Provide 103mm suitable facing brick. Ensure a 50mm clear residual cavity and provide 85mm Celotex CW4000 insulation fixed to internal leaf constructed of 100mm, 0.15 W/m²K lightweight block.....register here for our full specifications and web apps.
To achieve minimum U Value of 0.18 W/m²K
Provide 103mm suitable facing brick. Ensure a 50mm clear residual cavity and provide 85mm Celotex CW4000 insulation fixed to internal leaf constructed of 100mm, 0.15 W/m²K lightweight block.....register here for our full specifications and web apps.
Many more Building Regs Specs for extension walls here.
TIMBER FRAME WALL
To achieve minimum U Value of 0.18 W/m²K
Outer skin to be 102mm suitable facing brick with 50mm vented and drained cavity provided between the stud and brick cladding.
Inner stud to have breathable membrane (a vapour resistance of not more than 0.6 MNs/g) fixed to 12mm thick W.B.P external quality plywood sheathing (or other approved).
Ply fixed to treated timber frame studs constructed using 150mm x 50mm treated timbers with head and sole plates and vertical studs (with noggins) at 400mm ctrs, or to s/engineer's details and calculations.
Insulation to be 70mm Kingspan Kooltherm between studs with.....register here for our full specifications and web apps.
To achieve minimum U Value of 0.18 W/m²K
Outer skin to be 102mm suitable facing brick with 50mm vented and drained cavity provided between the stud and brick cladding.
Inner stud to have breathable membrane (a vapour resistance of not more than 0.6 MNs/g) fixed to 12mm thick W.B.P external quality plywood sheathing (or other approved).
Ply fixed to treated timber frame studs constructed using 150mm x 50mm treated timbers with head and sole plates and vertical studs (with noggins) at 400mm ctrs, or to s/engineer's details and calculations.
Insulation to be 70mm Kingspan Kooltherm between studs with.....register here for our full specifications and web apps.
UNDERGROUND FOUL DRAINAGE
Underground drainage to consist of 100mm diameter UPVC proprietary pipework to give a 1:40 fall.
Surround pipes in 100mm pea shingle.
Provide 600mm suitable cover (900mm under drives).
Shallow pipes to be covered with 100mm reinforced concrete slab over compressible.....register here for our full specifications and web apps.
Underground drainage to consist of 100mm diameter UPVC proprietary pipework to give a 1:40 fall.
Surround pipes in 100mm pea shingle.
Provide 600mm suitable cover (900mm under drives).
Shallow pipes to be covered with 100mm reinforced concrete slab over compressible.....register here for our full specifications and web apps.
More Building Regs Specs for extension drainage here.
Clear construction Notes like these can be added to your specification with just a few clicks, with our Apps!
Beyond Guidance
Benefits of using BuildingRegs4Plans
Creating the list of Building Notes for Building Plans can be a long-winded task. The App on our site takes the hard work out of this essential part of Drawing Plans, going a step beyond guidance with pre-prepared construction notes and easy-to-use menus so that you can add Building Regs Notes as you need them.
Site features:
- Access to our Building Notes.
- Carefully prepared Building Notes written by Building Control Professionals.
- Categorised Building Regs notes within our slick App, allowing you to easily find the specifications that you want.
- Wide range of notes for different specifications eg for different rafter sizes, spans etc.
- An edit function to edit notes where you cannot find one to met your exact requirements.
- Compilation of Building Regulations Notes into a single Construction Specification / Note-List that can be copied and pasted into your CAD drawing-program.
- Building Regs Specs for House Extensions, Loft and Garage Conversions.
- Very Fast Website, optimised for speed. The App updates according to your choices, in milliseconds. Try it and see!
- Building Regs Notes that take into account the October 2010 changes to UK Building Regulations (England and Wales).
- The Specs are applicable to work undertaken in England & Wales only.
- Specially prepared Construction Detail Drawings available in AutoCAD-native DWG and JPEG formats (drawings available for purchase but entirely optional).
- Tested in most current version of common browsers including Edge, Internet Explorer, Mozilla Firefox, Google Chrome and Safari.
The App enables you to complete your whole note-list / specification but alternatively you may just come to grab individual notes as needed.
Sample Building Notes
Note: There are hundreds of Building Regulations Specifications (compiled by Building Control Professionals) on our Building Regs Apps for Extensions, Loft and Garage Connversions. Please Register Here for commercial use of all of the Apps including Loft and Garage Conversions. Checkout the Extensions App here.
STRIP FOUNDATION
Provide 225mm x 600mm concrete foundation, concrete mix to conform to BS EN 206:2013 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 2010 Building Regulations A1/2 and BS 8004:2015 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.
Provide 225mm x 600mm concrete foundation, concrete mix to conform to BS EN 206:2013 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 2010 Building Regulations A1/2 and BS 8004:2015 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.
Many more Building Regs Specs for extension foundations here.
DPC
Provide horizontal strip polymer (hyload) damp proof course to both leafs minimum 150mm above external ground level.
New DPC to be made continuous with .....register here for our full specifications and web apps.
Provide horizontal strip polymer (hyload) damp proof course to both leafs minimum 150mm above external ground level.
New DPC to be made continuous with .....register here for our full specifications and web apps.
WARM FLAT ROOF
(imposed load max 1.0 kN/m² - dead load max 0.75 kN/m²)
To achieve U value 0.15 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 laid on 18mm external quality ply (ply optional, see manufacturer's details) over 150mm Celotex XR4000 insulation.
Insulation bonded to VCL fixed to 18mm exterior grade plywood on firrings to give 1:40 fall on 47 x 145mm C24 timber joists at 400 ctrs to give a max span of 3.22m (see Engineer's details for sizes).
Ceiling construction to be 12.5mm plasterboard over vapour barrier with skim plaster finish.
Provide restraint to.....register here for our full specifications and web apps.
(imposed load max 1.0 kN/m² - dead load max 0.75 kN/m²)
To achieve U value 0.15 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 laid on 18mm external quality ply (ply optional, see manufacturer's details) over 150mm Celotex XR4000 insulation.
Insulation bonded to VCL fixed to 18mm exterior grade plywood on firrings to give 1:40 fall on 47 x 145mm C24 timber joists at 400 ctrs to give a max span of 3.22m (see Engineer's details for sizes).
Ceiling construction to be 12.5mm plasterboard over vapour barrier with skim plaster finish.
Provide restraint to.....register here for our full specifications and web apps.
Many more Building Regs Specs for extension roofs here.
EXTRACT TO KITCHEN
Kitchen to have mechanical ventilation with an extract rating of 60 l/s, or 30 l/s if adjacent to hob to external air.
Internal doors should be provided with a 10mm gap below the door to aid air circulation.
Ventilation provision in accordance with the Domestic Ventilation Compliance Guide. Intermittent extract fans to BS EN 13141-4.
Cooker hoods to BS EN 13141-3......register here for our full specifications and web apps.
Kitchen to have mechanical ventilation with an extract rating of 60 l/s, or 30 l/s if adjacent to hob to external air.
Internal doors should be provided with a 10mm gap below the door to aid air circulation.
Ventilation provision in accordance with the Domestic Ventilation Compliance Guide. Intermittent extract fans to BS EN 13141-4.
Cooker hoods to BS EN 13141-3......register here for our full specifications and web apps.
NEW AND REPLACEMENT WINDOWS
New and replacement windows to be double glazed with 16-20mm argon gap and soft coat low-E glass.
Window Energy Rating to be Band B or better and to achieve U-value of 1.4 W/m²K.
The door and window openings should be limited to 25% of the extension floor area plus the area of any existing openings covered by the extension.
Insulated plasterboard to be used in reveals to abut jambs and to be considered within reveal soffits.
Fully insulated and continuous cavity closers to be......register here for our full specifications and web apps.
New and replacement windows to be double glazed with 16-20mm argon gap and soft coat low-E glass.
Window Energy Rating to be Band B or better and to achieve U-value of 1.4 W/m²K.
The door and window openings should be limited to 25% of the extension floor area plus the area of any existing openings covered by the extension.
Insulated plasterboard to be used in reveals to abut jambs and to be considered within reveal soffits.
Fully insulated and continuous cavity closers to be......register here for our full specifications and web apps.
INTERMEDIATE FLOORS
Intermediate floor to be 25mm t&g flooring grade chipboard or floorboards laid on C24 joists at 400mm ctrs (see Engineer's calculation for sizes and details).
Lay 100mm Rockwool mineral fibre quilt insulation min 10kg/m³ or equivalent between floor joists.
Ceiling to be 12.5 Fire-Line plasterboard with skim plaster set and finish.
Joist spans over 2.5m to be strutted at mid span using 38 x 38mm herringbone strutting or 38mm solid strutting (at least 2/3 of joist depth).
In areas such as kitchens, utility rooms and bathrooms, flooring to be moisture resistant grade in accordance with BS EN 312.
Identification marking must be laid upper most to allow......register here for our full specifications and web apps.
Intermediate floor to be 25mm t&g flooring grade chipboard or floorboards laid on C24 joists at 400mm ctrs (see Engineer's calculation for sizes and details).
Lay 100mm Rockwool mineral fibre quilt insulation min 10kg/m³ or equivalent between floor joists.
Ceiling to be 12.5 Fire-Line plasterboard with skim plaster set and finish.
Joist spans over 2.5m to be strutted at mid span using 38 x 38mm herringbone strutting or 38mm solid strutting (at least 2/3 of joist depth).
In areas such as kitchens, utility rooms and bathrooms, flooring to be moisture resistant grade in accordance with BS EN 312.
Identification marking must be laid upper most to allow......register here for our full specifications and web apps.
SUSPENDED BLOCK AND BEAM FLOOR
To meet min U value required of 0.18 W/m²K
Remove top soil and vegetation and apply weed killer – provide 50mm concrete ground cover if required by BCO.
The underside of beams to be 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 for approval before works commence). Beam to have a minimum bearing of 100mm onto DPC and load bearing walls.
Provide concrete blocks to BS EN 772-2, wet and grout all joints with 1:4 cement/sand mix. Provide double beams below non-load bearing partitions.
Lay 1200g DPM/radon barrier over beam and block floor, with 300mm laps double welted and taped at joints and service entry points using radon gas proof tape.
Lay floor insulation over DPM, 90mm Celotex GA4000 applied as a rigid material. 25mm insulation to continue around floor perimeters to avoid thermal bridging.
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.
To meet min U value required of 0.18 W/m²K
Remove top soil and vegetation and apply weed killer – provide 50mm concrete ground cover if required by BCO.
The underside of beams to be 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 for approval before works commence). Beam to have a minimum bearing of 100mm onto DPC and load bearing walls.
Provide concrete blocks to BS EN 772-2, wet and grout all joints with 1:4 cement/sand mix. Provide double beams below non-load bearing partitions.
Lay 1200g DPM/radon barrier over beam and block floor, with 300mm laps double welted and taped at joints and service entry points using radon gas proof tape.
Lay floor insulation over DPM, 90mm Celotex GA4000 applied as a rigid material. 25mm insulation to continue around floor perimeters to avoid thermal bridging.
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.
Many more Building Regs Specs for extension floors here.
WARM PITCHED ROOF
Pitch 22-45° (imposed load max 0.75 kN/m² - dead load max 0.75 kN/m²)
To achieve min U-value required of 0.15 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 1995-1-1:2004 Eurocode 5: Design of timber structures.
Roofing tiles to match existing fixed to tile battens secured over breathable felt to relevant BBA Certificate allowing the breather felt to sag at least 10mm over preservative-treated counter battens (min 38mm x 50mm).
Provide 100mm Celotex GA4000 insulation boards under the counter battens and 40mm Celotex TB4000 between 47 x 100mm timber rafters strength class C24 at 400 c/c – to give a max 2.12m span.
A vapour control layer should be provided to the underside of the rafters. Finish with 12.5mm plasterboard and skim.
Restraint strapping - Ceiling joists tied to.....register here for our full specifications and web apps.
Pitch 22-45° (imposed load max 0.75 kN/m² - dead load max 0.75 kN/m²)
To achieve min U-value required of 0.15 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 1995-1-1:2004 Eurocode 5: Design of timber structures.
Roofing tiles to match existing fixed to tile battens secured over breathable felt to relevant BBA Certificate allowing the breather felt to sag at least 10mm over preservative-treated counter battens (min 38mm x 50mm).
Provide 100mm Celotex GA4000 insulation boards under the counter battens and 40mm Celotex TB4000 between 47 x 100mm timber rafters strength class C24 at 400 c/c – to give a max 2.12m span.
A vapour control layer should be provided to the underside of the rafters. Finish with 12.5mm plasterboard and skim.
Restraint strapping - Ceiling joists tied to.....register here for our full specifications and web apps.
PARTIAL FILL CAVITY WALL
To achieve minimum U Value of 0.18 W/m²K
Provide 103mm suitable facing brick. Ensure a 50mm clear residual cavity and provide 85mm Celotex CW4000 insulation fixed to internal leaf constructed of 100mm, 0.15 W/m²K lightweight block.....register here for our full specifications and web apps.
To achieve minimum U Value of 0.18 W/m²K
Provide 103mm suitable facing brick. Ensure a 50mm clear residual cavity and provide 85mm Celotex CW4000 insulation fixed to internal leaf constructed of 100mm, 0.15 W/m²K lightweight block.....register here for our full specifications and web apps.
Many more Building Regs Specs for extension walls here.
TIMBER FRAME WALL
To achieve minimum U Value of 0.18 W/m²K
Outer skin to be 102mm suitable facing brick with 50mm vented and drained cavity provided between the stud and brick cladding.
Inner stud to have breathable membrane (a vapour resistance of not more than 0.6 MNs/g) fixed to 12mm thick W.B.P external quality plywood sheathing (or other approved).
Ply fixed to treated timber frame studs constructed using 150mm x 50mm treated timbers with head and sole plates and vertical studs (with noggins) at 400mm ctrs, or to s/engineer's details and calculations.
Insulation to be 70mm Kingspan Kooltherm between studs with.....register here for our full specifications and web apps.
To achieve minimum U Value of 0.18 W/m²K
Outer skin to be 102mm suitable facing brick with 50mm vented and drained cavity provided between the stud and brick cladding.
Inner stud to have breathable membrane (a vapour resistance of not more than 0.6 MNs/g) fixed to 12mm thick W.B.P external quality plywood sheathing (or other approved).
Ply fixed to treated timber frame studs constructed using 150mm x 50mm treated timbers with head and sole plates and vertical studs (with noggins) at 400mm ctrs, or to s/engineer's details and calculations.
Insulation to be 70mm Kingspan Kooltherm between studs with.....register here for our full specifications and web apps.
UNDERGROUND FOUL DRAINAGE
Underground drainage to consist of 100mm diameter UPVC proprietary pipework to give a 1:40 fall.
Surround pipes in 100mm pea shingle.
Provide 600mm suitable cover (900mm under drives).
Shallow pipes to be covered with 100mm reinforced concrete slab over compressible.....register here for our full specifications and web apps.
Underground drainage to consist of 100mm diameter UPVC proprietary pipework to give a 1:40 fall.
Surround pipes in 100mm pea shingle.
Provide 600mm suitable cover (900mm under drives).
Shallow pipes to be covered with 100mm reinforced concrete slab over compressible.....register here for our full specifications and web apps.
More Building Regs Specs for extension drainage here.
Clear construction Notes like these can be added to your specification with just a few clicks, with our Apps!
To begin compiling your Building Regulations Specification with our App, choose either House Extension, New Build, Flat Conversion, Loft Conversion or Garage Conversion.
