June Residential New Build 2.0 Code For Sustainable Homes

Transcription

1 June 2010 Residential New Build 2.0 Code For Sustainable Homes

2 Residential new build 2.0 Residential New Build Introduction page Products and applications 134 The Code for Sustainable Homes 136 Design Optimisation 146

3 2.1 Residential new build: Products and applications Products and applications Earthwool glass mineral wool Roll Slab Design optimiser page Design details page Acoustic Floor Roll Acoustic Joist Roll Acoustic Partition Roll CarbonZero Loft Roll Cavity Barriers (strip) FrameTherm Roll Loft Roll 40 and 44 Loft Roll 270mm Rafter Roll 32 Room-in-Roof Roll Space Blanket Space Combi-Roll SteelTherm Roll Universal Roll Acoustic Party Wall Slab DriTherm Cavity Slab FrameTherm Slab Universal Slab Product data sheet page Pitched roofs ceiling level J J J J J l Pitched roofs rafter level l J J l Flat roofs Green roofs Built-up metal roofs External walls - masonry cavity J J External walls - timber frame J J J External walls - light steel frame J J J J External walls - render and cladding J Floors - ground Floors - exposed soffit J Basements Internal - separating walls J Internal - separating floors J J Internal - partitions J l Internal - floors J J l Beam and column encasement Product suitability key J Recommended use Possible use 134

4 Residential new build: Products and applications 2.1 Earthwool rock mineral wool Rocksilk rock mineral wool Polyfoam XPE and XPS Acoustic Floor Slab Acoustic Floor Slab Plus DriTherm Cavity Slab Flexible Slab RainScreen Slab Soffit Linerboard Extra Slab Soffit Linerboard Standard Thermal Floor Slab Thermal Floor Slab Plus Universal Slab Dry Fix Noggin Slab FireTech Slab Krimpact Facade Slab Krimpact Flat Roof Slab Perimeter Plus Pitched Roof Slab Smoke and Fire Barrier Supafil Cavityboard Cut-to-Falls Loose wool Floorboard Floorfoam (roll) Pitched Roofboard Raftersqueeze Floorfoam Easy Edge Strip (roll) Board, strip, membrane and roll Roofboard Sarking Board System Slimline (membrane) Soffit Linerboard Space Board Knauf Fireboard Knauf accessories l l J J J J J J J J J J J J J J J l J J l J J J J J J J J J J J J J J l J J l J J l l J J J J J 135

5 2.2 Residential new build: Code for Sustainable Homes The Code for Sustainable Homes Introduction What is the Code for Sustainable Homes? The Code for Sustainable Homes constitutes a step change in sustainable home building practice by the Department for Communities and Local Government. Since May 2008 all new homes are required to have a Code rating against the Code and for a Code certificate to be included within the Home Information Pack (HIP). It is intended as a single national standard to guide house builders in the design and construction of sustainable homes. At the time of publication it only applies to developments in England. The Code will form the basis for future developments of the Building Regulations in relation to carbon emissions from homes and so offer a greater regulatory certainty for developers. In this era of environmental awareness amongst consumers and increasing demand for more sustainable products, the Code offers a tool for developers to demonstrate the environmental credentials of their dwellings. The level of energy performance required by the Code for Sustainable Homes is in excess of the requirements of the Building Regulations and also covers additional design categories that influence the sustainability of homes. The pie chart (right) shows the nine categories listed in the Code and the relative importance of each in arriving at an overall sustainability rating. The Code uses a rating system of one to six stars as shown in the timeline opposite. For each star rating, the table shows the minimum mandatory number of points required for energy and water plus the number of additional tradable points required. Where a dwelling does not achieve Code level 1, a no rating will be given. To achieve a high star rating it is essential to improve the energy efficiency of the dwelling, as measured by the SAP 2005 energy rating system. Pollution Waste Health and well being Surface water run off Materials Management Water Ecology Energy/CO 2 This can be done by: Improving the thermal efficiency of the walls, roof and floor, by using more insulation for example Reducing air permeability by improved detailed design and attention to construction quality Carefully designing the fabric of the home to reduce thermal bridging Increasing the proportion of renewable or zero carbon technologies to supply the energy needs of the dwelling as the star rating is increased 136

6 Residential new build: Code for Sustainable Homes 2.2 How does the Code work? Star rating system The Code uses a sustainability rating system indicated by stars to communicate the overall sustainability performance of a home. A home can achieve a rating from one to six stars, depending upon the extent to which it has achieved Code standards. Minimum standards Minimum standards exist for a number of categories, which must be achieved to obtain a one star sustainability rating. There are minimum energy and water efficiency standards at every level of the code, recognising the importance of these two areas. Choice Apart from these requirements, developers are free to choose which and how many standards they implement to obtain sustainability star ratings. Assessment procedure Code Assessments are carried out in two stages as detailed below: The first part of the assessment is carried out at the design stage (called the Design Stage Assessment) and each Code Dwelling Type is given an Interim Code certificate at this stage. The second part is carried out after construction (called the Post Construction Review) and each Dwelling is given a Final Code certificate at this stage. Formal assessment of dwellings using the Code for Sustainable Homes may only be carried out using licensed and registered individuals, who are qualified competent persons for the purpose of carrying out Code assessments. Training, registration and licensing of these individuals is carried out by the Building Research Establishment according to a UKAS registered competent persons scheme in accordance with ISO and ISO BRE also carry out quality assurance of the assessments and issue certificates on behalf of The Department for Communities and Local Government. What are the benefits of the Code? Benefits for housebuilders A common measure of sustainability: Increasing media attention and public concern over environmental issues, notably climate change, has given rise to a growing appetite among consumers for more sustainable products and services. The Code for Sustainable Homes can be used by housebuilders to demonstrate the sustainability performance of their homes, and to differentiate themselves from their competitors. Regulatory certainty: The levels of performance for energy efficiency indicate the future direction of building regulations see timeline below. Flexibility: The Code is based on performance which means it sets levels for sustainability performance against each element but does not prescribe how to achieve each level. Housebuilders can innovate to find cost-effective solutions. Benefits for social housing providers Lower running costs: Homes built to a Code standard will have lower fuel and water bills, so helping to reduce fuel poverty. Improved comfort and satisfaction: Homes built to the Code will enhance the comfort and satisfaction of tenants. Costs may be saved in dealing with complaints. Raised sustainability credentials: The Code will enable social housing providers to demonstrate their sustainability credentials to the public, tenants and funding bodies. Benefits for the environment Reduced greenhouse gas emissions: With minimum standards for energy efficiency at each level of the Code, there will be a reduction in greenhouse gas emissions to the environment. This will enable us to reduce the threat from climate change. Better adaptation to climate change: The Building Regulations (Approved Document L 2006) already limit the effects of solar gains in Summer. With minimum standards for water efficiency at each level of the Code, and other measures such as better management of surface water run-off, our future housing stock will be better adapted to cope with the already inevitable impacts of climate change. Reduced impact on the environment overall: Inclusion of measures which, for example, promote the use of less polluting materials, and encourage household recycling, will ensure that our future housing stock has fewer negative impacts overall on the environment. Benefits for consumers Assisting choice The Code will provide valuable information to homebuyers on the sustainability performance of different homes, helping them in their choice of a new home. Reducing environmental footprint : By asking for a new home which meets the Code standard, consumers will be able to encourage the building industry to build more sustainable homes, and reduce their own footprint on the environment. Lower running costs: Homes built to Code standard will have lower running costs through greater energy and water efficiency than homes not built to the Code standard, so helping to reduce fuel poverty. Improved well-being: Homes built to Code standard will provide a more pleasant and healthy place to live, for example with more natural light, and adaptability for future needs. Timeline for the introduction of Code Levels Public sector Public sector Public sector Public sector Level 3 - Mandatory Level 4 - Mandatory Level 6 - Mandatory Level 6 - Mandatory Private sector Private sector Private sector Private sector Code rating Level 3 - Mandatory Level 4 - Mandatory Level 6 - Mandatory mandatory 137

7 2.2 Residential new build: Code for Sustainable Homes The Code for Sustainable Homes Meeting the Code s energy and carbon requirements Table 1: Mandatory requirements for each code level Energy Minimum standards Water minimum standards Code level Minimum standard (% better than Part L1, 2006) Points awarded Minimum standard (litres per day) Points awarded Additional points required* Total points required 1 ( ) ( ) ( ) ( ) ( ) ( ) A zero carbon home * These additional points must include the minimum requirements for the Materials, Surface Water Run-off and Waste categories. Table 2: Sample design specifications for achieving code levels Code level Target % C0 2 reduction TER Actual DER Actual % saving 100% LEL actual DER 100% LEL actual 1% saving Walls Roof flat ceiling L1A 0% % % % % % % % * 100% % % Floor Roof sloping ceiling Window Rooflight Code level Door Thermal bridging Air leakage rate HLP Code level Boiler type Hot water Solar hot water Secondary heating Ventilation type L1A gas 88% cylinder 50mm foam Gas 63% Intermittent fans 3 gas 91.3% 145 litres LF 1.65 Gas 85% MVHR (0.89/89) 4 gas 91.3% 210 litres LF m 2 of flat plate Gas 85% MVHR (0.89/89) Low and zero carbon technology 5* GSHP 320% 210 litres LF m 2 of flat plate Wood MVHR (0.89/89) 2.5 kwhp PV *The definitions of Zero Carbon, whilst published, are not completely resolved. This is particularly true when considering the location and relationship of electrical generation to the development. As such it makes sense whilst uncertainty exists to illustrate compliance with the Code Level 5 requirements and use this as a benchmark for Code Level 6 performance requirements. Potential solution for off gas small developments/single dwellings. DER Dwelling Emission Rate this is the CO 2 emission rate for the proposed dwelling. It is expressed in terms of kg/ m 2 /yr. Two DER calculations will be needed. The first at the design stage based on plans and specifications used in the submission to the Building Control. The second on completion of building. The DER is calculated using approved SAP software. SAP 2005 All the models above have been calculated using SAP This is the Government s Tool for calculating Target and Dwelling emission rates (TER/DER). This tool is to be revised over the next two years and one change will be improved modelling of low energy dwellings and low and zero carbon technologies. This could result in the models illustrated here and on the following pages achieving different values from those currently seen. TER Target carbon dioxide Emission Rate this is the energy performance target that must be achieved to comply with the requirements of the Approved Document. It is expressed in terms of kg/m 2 /yr. The TER is calculated using approved SAP software. Low Energy Lighting The DER is currently calculated assuming no more than 30% Low Energy Lights, however it is expected to change to 100% with the phasing out of inefficient tungsten filament lamps. All solutions at code level 4 or higher are designed for compliance with 100% Low Energy Lighting. HLP Heat Loss Parameter The total fabric and ventilation heat losses from the dwelling divided by the total floor area (W/m 2 K). Ground Source Heat Pumps Currently the TER calculated for dwellings using electricity as the fuel for the main system is uplifted according to the TER formula including the fuel factor. This was included in Part L1A 2006, but it seems likely that this loophole will be closed in future regulations for GSHP and the Fuel Factor will be omitted from the TER. In the criteria produced above the TER for dwellings using GSHP are calculated WITHOUT the Fuel Factor to reflect the anticipated requirements of the building regulations. If used now whilst the fuel factor can still be applied these solutions will result in greater savings than are required for each code level. 138

8 Residential new build: Code for Sustainable Homes 2.2 The following chart is a guide to how Knauf Insulation products can specifically help you gain points to achieve the highest possible sustainability rating for your project. Category Which credits are applicable? How can Knauf Insulation products Credits help you gain those credits? available Energy/CO 2 Operational energy and the resulting emissions of carbon dioxide to the atmosphere Credits are gained according to percentage improvement over the Target Emission Rate (TER) as determined by the 2006 Building Standards. We have solutions that meet all levels of the Code. Up to 17 credits Water The consumption of potable water from the public supply systems or other ground water resources Materials The embodied environmental impacts of construction materials for key construction elements Surface water runoff The change in surface water runoff patterns as a result of the development Waste Waste generated as a result of the construction process and facilities encouraging recycling of domestic waste in the home Credits can be gained if your site waste management plan includes procedures and commitments to minimise on-site waste. Credits can also be gained for sorting, reusing and recycling construction waste, either on site or through a licensed external contractor. Our glass mineral wool and rock mineral wool insulation products can be recycled and reused at end of life. Up to 2 credits Pollution Pollution resulting from the operation of the dwelling Credits are gained if the insulating materials used avoid the use of substances that have a global warming potential (GWP) of 5 or more (and an Ozone Depleting Potential of zero) in either their manufacture or composition. The following elements are considered: Roof (including loft access) Walls internal and external (including doors, lintels and all acoustic insulation) Floor (including foundations) Hot water cylinder, pipe insulation and other thermal stores Our glass mineral wool and rock mineral wool insulation products have a GWP of zero and an ODP of zero. Up to 4 credits Health and wellbeing The effect that the dwellings design and indoor environment has on its occupants Credits are gained for achieving higher standards of sound insulation than required by Part E of the Building Regulations. This must be demonstrated by using either post-completion testing (PCT) or Robust Details (RD). Our glass mineral wool and rock mineral wool insulation products meet the highest standards of sound insulation. We also have a number of Robust Detail approved glass mineral wool and extruded polyethylene products suitable for PCT/RD. Up to 4 credits Management Steps that have been taken to allow good management of environmental impacts in the construction and operation of the home Credits can be gained for a commitment and strategy to operate site management procedures which, amongst other items, can include reduced CO 2 emissions arising from transport to and from site. Our glass mineral wool insulation is compression packed meaning up to three times the volume of insulation per truckload, when compared to rigid foam boards so less deliveries per house. Up to 1 credit Ecology The impact of the dwelling on local eco-system, biodiversity and land use Total credits available 28 out of 104 Cracking the Code with Knauf Insulation The details on pages show four template houses each achieving a different code rating. There are, of course, an almost infinite number of design possibilities and construction options that could achieve the same code ratings however we have tried to focus on solutions which combine thermal and acoustical efficiency with cost-effectiveness. Table 2b illustrates the typical assumptions which have been used in deriving these template houses. There are a number of variables which can influence the decision making process in achieving the energy standards required by the code. Key design parameters The house used in the following examples is a three storey semidetached house with the third storey being largely a room in the roof. This arrangement was chosen because it was seen as being a good starting point for a typical new build dwelling. For the purposes of the Energy and Carbon Dioxide Emissions sections of the code there are correlations between detached and semi-detached and also between semidetached and terraced properties. There is greater divergence when flats are considered. Table 2b: Basic design parameters of example house Total Floor Area m 2 Total Dwelling Volume m 2 Total Area of Openings m 2 Ground Floor Area m 2 Net Wall Area m 2 Net Roof Area m 2 Window Orientation Living Area Fraction 0.2 Bathrooms and WC s 3 East-West 139

9 2.2 Residential new build: Code for Sustainable Homes Part L1A semi-detached house U-value Sloping ceiling 200mm Earthwool Room-in-Roof Roll 37 between rafters U-value Flat ceiling 270mm Earthwool Loft Roll U-value Masonry external wall Standard Aircrete inner leaf and 100mm Earthwool DriTherm U-value Timber frame external wall Masonry outer leaf 140mm FrameTherm 40 with a vapour permeable membrane U-value Ground floor Beam and block floor with 50mm Polyfoam Floorboard Standard U-value Ground floor Suspended timber 100mm Earthwool Loft Roll 44 Please also refer to page 138 for design assumptions. 140

10 Residential new build: Code for Sustainable Homes 2.2 The Code Level 3 ( ) semi-detached house Minimum standards 25% more thermally efficient than Part L (5.8 pts) Water consumption per person per day 105 litres (4.5 pts) Additional points needed U-value Sloping ceiling 100mm Earthwool Room-in-Roof Roll mm Earthwool Rafter Roll 32 between rafters U-value Flat ceiling 100mm Earthwool Loft Roll 44 between joists and 300mm above 0.24 U-value 0.24 U-value Masonry Timber frame external wall external wall Standard Aircrete inner leaf Masonry outer leaf and 100mm Earthwool 140mm Earthwool FrameTherm DriTherm with Low E Breather U-value Ground floor Beam and block floor with 100mm Polyfoam Floorboard Standard 0.16 U-value Ground floor Suspended timber floor with 200mm Earthwool Loft Roll 44 Please also refer to page 138 for design assumptions. Mandatory requirements Improved insulation (25% improvement over TER) Recommendations to achieve additional points 105 litres water consumption (per person per day) Minimum number of materials achieving D grade in Green Guide Surface water management system Adequate household recycling facilities Enhanced sound insulation Use of environmentally friendly materials Additional air drying space Cycle storage Site waste management plan to minimise construction waste Recommendations to achieve requirements Reduced air permeability (page 33) Water storage Recycling capacity within house Energy efficient lighting Home office space High efficiency condensing boiler Reduced thermal bridging (page 33) Introduction of district heating system or low and zero carbon technologies to help heat the hot water Enhanced security 141

11 2.2 Residential new build: Code for Sustainable Homes The Code Level 4 ( ) semi-detached house Minimum standards 44% more thermally efficient than Part L (9.4 pts) Water consumption per person per day 105 litres (4.5 pts) Additional points needed U-value Sloping ceiling 200mm Earthwool Room-in-Roof Roll 37 plus 50mm Rocksilk Pitched Roof Slab U-value Flat ceiling 100mm Earthwool Loft Roll 44 between joists and 300mm above 0.20 U-value Masonry external wall Standard Aircrete inner leaf and 130mm Earthwool DriTherm U-value Timber frame external wall Masonry outer leaf 140mm Earthwool FrameTherm 40 with 50mm Earthwool DriTherm 37 and a vapour permeable membrane - Partial Fill U-value Ground floor Beam and block floor with 100mm Polyfoam Floorboard Standard 0.16 U-value Ground floor Suspended timber floor with 200mm Earthwool Loft Roll 44 Mandatory requirements Improved insulation (44% improvement over TER) Recommendations to achieve additional points 105 litres water consumption (per person per day) Minimum number of materials achieving D grade in Green Guide Surface water management system Adequate household recycling facilities Enhanced sound insulation Use of environmentally friendly materials Additional air drying space Cycle storage Site waste management plan to minimise construction waste Recommendations to achieve requirements Reduced air permeability (page 33) High efficiency condensing boiler Home office space Water storage Recycling capacity within house Energy efficient lighting Reduced thermal bridging (page 33) Introduction of district heating system or low and zero carbon technologies to help heat the hot water Enhanced security Accessible rainwater butts Improved day lighting Build to Lifetime Homes standard 142

12 Residential new build: Code for Sustainable Homes 2.2 The Code Level 5/6 semi-detached house* Minimum standards Zero carbon home (16.4/17.6 pts) Water consumption per person per day 80 litres (7.5 pts) Additional points needed 60.1/64.9 * The definitions of Zero Carbon, whilst published, are not completely resolved. This is particularly true when considering the location and relationship of electrical generation to the development. As such, it makes sense, whilst uncertainty exists, to illustrate compliance with the Code Level 5 requirements and use this as a benchmark for Code Level 6 performance requirements U-value Sloping ceiling 200mm Earthwool Room-in-Roof Roll 37 plus 50mm Rocksilk Pitched Roof Slab U-value Flat ceiling 100mm Earthwool Loft Roll 44 between joists and 300mm above 0.16 U-value Masonry external wall Standard Aircrete inner leaf and 170mm Earthwool DriTherm U-value Timber frame external wall Masonry outer leaf 140mm Earthwool FrameTherm 35 with 50mm Earthwool DriTherm 37 and Low E service duct - Partial Fill U-value Ground floor Beam and block floor with 125mm Polyfoam Floorboard Standard 0.16 U-value Ground floor Suspended timber floor with 200mm Earthwool Loft Roll 44 Please also refer to page 138 for design assumptions. Mandatory requirements Improved insulation (net zero carbon emissions from all energy use in the home) 80 litres of water consumption (per person per day) Minimum number of materials achieving D grade in Green Guide Surface water management system Adequate household recycling facilities Site waste management plan to minimise construction waste Recommendations to achieve requirements Maximum possible reduction of air permeability (page 33) High efficiency condensing boiler, wood pellet boiler or district heating system Maximum reduction of thermal bridging (page 33) Use of low/zero carbon technologies such as solar panels, biomass boilers, wind turbines combined heat/power systems Any national grid energy usage would have to be replaced 30% water from rainwater harvesting or grey water recycling systems Recommendations to achieve additional points Enhanced sound insulation Home office space Enhanced security Use of environmentally friendly materials Water storage Accessible rainwater butts Additional air drying space Recycling capacity within house Improved day lighting Cycle storage Energy efficient lighting Build to Lifetime Homes standard 143

13 2.2 Residential new build: Code for Sustainable Homes The Code for Sustainable Homes Construction tables The following tables, though not exhaustive, indicate a range of solutions for insulating critical areas of a residential project. Any or all of these solutions can be employed singly or together to help achieve a range of ratings as set out in the Code for Sustainable Homes. Table 3: Constructions meeting Code requirements Roofs Flat ceilings (pages ) Sloping ceilings (pages ) Code Level U-value Between and across joints U-value Between rafter only U-value Between and over rafter Part L1A 0.16 Earthwool Loft Roll 270mm mm Earthwool Room-in-Roof Roll mm Earthwool CarbonZero Roll mm Earthwool CarbonZero Roll 5/ mm Earthwool CarbonZero Roll mm Earthwool Room-in-Roof Roll 32 and 100mm Earthwool Rafter Roll mm Earthwool Room-in-Roof Roll mm Rocksilk Pitched Roof Slab mm Earthwool Room-in-Roof Roll mm Rocksilk Pitched Roof Slab 144

14 Residential new build: Code for Sustainable Homes 2.2 External walls Code Level U-value Block type Masonry cavity (pages ) U-value Masonry cavity blown in (page 576) Part L1A Aircrete 100mm Earthwool DriTherm mm Supafil Aircrete 100mm Earthwool DriTherm mm Supafil/Supafil Green Aircrete 130mm Earthwool DriTherm mm Supafil 5/ Aircrete 170mm Earthwool DriTherm mm Supafil Green Code Level U-value Block type Timber frame (pages ) Part L1A 0.29 Masonry outer leaf 140mm (90mm+50mm) Earthwool FrameTherm 40 (with a vapour permeable membrane) Masonry outer leaf 140mm (90mm+50mm) Earthwool FrameTherm 32 (with low E breather) Masonry outer leaf 140mm (90mm+50mm) Earthwool FrameTherm 40 (with a vapour permeable membrane) with 50mm Earthwool DriTherm 37 partial fill 5/ Masonry outer leaf 140mm (90mm+50mm) Earthwool FrameTherm 35 (with a vapour permeable membrane) with 50mm Earthwool DriTherm 37 partial fill U-value Timber frame blown in (page 596) mm Perimeter Plus with 50mm Earthwool DriTherm Cavity Slab mm Perimeter Plus with 65mm Earthwool DriTherm Cavity Slab mm Perimeter Plus with 85mm Earthwool DriTherm Cavity Slab mm Perimeter Plus with 75mm Earthwool DriTherm Cavity Slab 32 Ground floors Code Level U-value Ratio of perimeter (m) to area (m 2 ) Beam and block (pages ) U-value Suspended timber (page 630) Part L1A mm Polyfoam Floorboard Standard mm Earthwool Loft Roll mm Polyfoam Floorboard Standard mm Earthwool Loft Roll mm Polyfoam Floorboard Standard mm Earthwool Loft Roll 44 5/ mm Polyfoam Floorboard Standard mm Earthwool Loft Roll

15 2.3 Residential new build: Design optimisation Design optimisation Guidance on using the Solution Optimiser and Pathfinders With the performance targets of the Code for Sustainable Homes as our key driver, Knauf Insulation has developed a series of Design solution optimisers. These are designed to demonstrate to the designer how to achieve solutions that surpass today s requirements and meet those of the future through to the carbon neutral requirements of The ability of our products to meet the key Code levels is based on a clear set of assumptions and parameters as shown on pages In order to arrive at your required code level or performance, simply work through the following steps: Optimising your construction solution 1Use optimiser tables to evaluate a range of constructions and establish performance levels Pitched roof with insulation at ceiling level Construction 5/6* by 2016 compatibility with Code for Sustainable 4* by 2013 Homes rating 3* by 2010 Performance scale Part L1A by 2007 Knauf Insulation solution U-values Between and above joists one layer Product*: Earthwool Loft Roll 270mm Description: One layer of extra thick glasswool between and overlapping joists Page No: 500 Between and above joists two layers Product*: Earthwool Loft Roll 44/40 Description: Two layers of glasswool between and above joists Pc01 Review the range of solutions and choose the solution that fits within the span of U-values which will contribute towards your required code level or performance (note that in many cases there will be more than one potential solution which meets your requirements). Consider thermal, acoustic and fire performance. Each solution has a unique reference number for easy on line identification. Note that these solutions are based on the construction parameters outlined on pages and variations in heating, mechanical ventilation and other elements of the building s construction could impact on these U-values. A full SAP calculation must be carried out in every case in order to confirm exact U-values. Performance achievable by this solution Solution and Find online code Solution, product descriptions and page references to find solution (see 3, opposite) 146

16 Residential new build: Design optimisation 2.3 Find the relevant page(s) within Section 6 of this guide in order to obtain more precise design details, U-values, 2drawings and NBS clauses for your chosen solution. For more product-specific information on your solution, refer to the appropriate 3page in Section 7 as identified. Where appropriate, review current legislation in depth, 4section 1.0 pages

17 Knauf Insulation Ltd PO Box 10 Stafford Road St Helens Merseyside WA10 3NS UK Tel: Fax: Ref: KB June 2010 Knauf Insulation Ltd Customer Service (Sales) Technical Advisory Centre Literature PO Box 10 Tel: Tel: Tel: Stafford Road Fax: Fax: Fax: St Helens Merseyside WA10 3NS