An introduction to Part L 2010

Transcription

1 October 2010 An introduction to Part L 2010 Straight talking solutions

2 Contents Section 1 The Approved Document Introduction to changes Road to Zero Carbon Implementation and transitional Period Sustainability Road map Document structure Responsibility for compliance Theoretical building performance vs Actual building Performance Summary of Main Changes to Part L (2010) U-Value Competency Influential design principals Section 2 New Build Dwellings (ADL1A) New Dwellings Method of compliance - SAP 2009 (adopting the Flat Approach) New build dwelling: U-value guide Main changes to SAP 2009 (New Build Dwellings (ADL1A)) New Dwelling Case studies Solutions that meet PART L1A - without renewable energy generation Party Wall Bypass Reducing heat loss from party walls Acoustic Solutions Section 4 Work on Existing Buildings Dwellings (ADL1B) & Non-dwellings (ADL2B) Scope of works covered Elemental U-values for Extension work Upgrading retained thermal elements & Refurbishing in existing buildings (Dwellings & Non dwellings) Section 5 New Build guide solutions External wall construction to achieve a U-value of 0.25 W/m 2 k Roof construction to achieve U-values of 0.16 or 0.13 W/m 2 k Minimising Cold Bridging - Extensions & New Buildings External wall construction to achieve U-values of 0.28 W/m 2 k Roof construction to achieve U-values of 0.16 or 0.18 W/m 2 k Section 6 Insulating Pipes and Ducts The Part L second-tier documents for pipe and duct insulation Domestic heating compliance guide Minimum provision Non-domestic heating, cooling and ventilation compliance guide Pipework and duct insulation Section 3 L2A New Builds OTHER than dwellings (ADL2A) Method of compliance Air Pressure testing New Build Non Dwellings U-value Guide Improved rain noise performance using roofing solutions Section 7 BuidDesk Part L 2010 Solutions 26 Section 8 About Rockwool 27 Sustainability Continuing Professional Development (CPD) Technical support

3 Section 1 The Approved Document Introduction to the changes The new standards should deliver a 25% reduction in carbon emissions from new buildings relative to the standards set in the 2006 Part L (equivalent to Code Level 3 Code for Sustainable homes). The new standards will make new homes and non-dwellings more energy efficient, typically saving householders 100 a year on their heating bills and around 2 million tonnes of carbon saved every year by Section 1 One of the key features of Part L 2010 is a drive to close the gap between the performance anticipated at design stage and what is actually achieved. These new measures will assist in delivering real carbon savings without creating obstacles for house builders during the economic recovery. It is clear the new amendments will still enable builders and designers to achieve compliance through the efficiency of the building fabric alone, whilst at the same time ensuring that more efficient, air-tight homes and other buildings are sufficiently ventilated. To ensure adequate means of ventilation is provided the Approved Document F has also been revised, and was implemented at the same time as Part L. Road to Zero Carbon The new part L will not only assist in cutting CO 2 emissions but also play a crucial part in achieving governments zero carbon policies. Proposed government time scales for future changes to energy efficiency standards 2013 > a 44% reduction in CO 2 emissions (Code Level 4) 2016 > Zero-carbon homes (Code Level 6 CFSH) 2019 > Zero-carbon (non-domestic buildings) The UK is also the first country to confirm legislation to require all new homes to be zero carbon from 2016, with all other buildings to meet the standard from Implementation and transitional Period The new Part L and F 2010 documents became enforceable on the 1st October The new Approved Documents still contain transitional provisions that allow building work to be completed after this date which conform with the requirements of Parts L & F This transitional period would apply to following: Existing work which had already started before 1st October 2010 and where a building notice or full plans had been deposited with the Building Control Body (BCB) New build, where a building notice or full plans had been deposited with the BCB before 1st October 2010 and work to have started on site before 1st October Sustainability Road map Private Sector: Code for sustainable homes Assessment Voluntary mandatory Level 3 mandatory Part L Update Level 4 mandatory Part L Update Level 6 mandatory Level 3 mandatory Level 4 mandatory Level 6 mandatory Code for Sustainable buildings Public Sector: Code for sustainable homes Straight talking solutions 3

4 Document structure As with the previous 2006 document, the new Part L 2010 is published in 4 parts. Dwellings L1 will be sub-divided into: L1A: New Dwellings (method of compliance SAP 2009) L1B: Work On Existing Dwellings (compliance achieved by the element approach) A Dwelling means a self contained unit such as a house or flat designed to accommodate a single household and must meet the requirements of ADL1 Rooms for residential purposes (such as nursing homes, residential homes, hostels, hotels etc) are not dwellings and must meet the requirements of ADL2 Non-dwellings L2 will be sub-divided into: L2A: New Buildings Other Than Dwellings (method of compliance NCM/SBEM 2010) L2B: Work On Existing Buildings Other Than Dwellings (compliance achieved by the element approach) Responsibility for Compliance Currently a great deal of responsibility is placed upon the developers to ensure compliance is met which often results in under compliance with the Building Regulations. For Building Control to properly enforce the changes, a more robust system of building assessment and performance checking is now being implemented It is important to remember that the person (e.g. designer, builder, installer) carrying out building work has a responsibility to ensure that the work complies with Building Regulation requirements. The building owner also has a responsibility for ensuring compliance and could be served with an enforcement notice in cases of non-compliance. 4 An introduction to Part L 2010

5 Theoretical building performance vs Actual building Performance One of the key features of the new Part L 2010 amendment is a drive to close the gap between the performance anticipated at design stage and what is actually achieved. There is increasing concern that current energy and carbon performance standards are not being achieved in buildings, as constructed. Apart from the results of air pressure tests, which suggest new buildings, (and homes especially), have become more air tight over time, there is a wider problem relating to buildings actually performing more poorly than they should. Evidence available suggests that for buildings being constructed to the 2006 regulations, emissions may be in the region of 15% higher than the regulatory performance level. (Research carried out by CLG). This is referred to by government as the performance gap. If we are to achieve true zero carbon by 2016 it is vital that this gap be closed. Section 1 New measures put in place to improve compliance on site 1) Clearer Guidance: The new document is clearer than previous versions in distinguishing between Regulation and Guidance. This should help developers better understand what is required of them and give building control clearer guidance on how to check for compliance. 2) Design Submissions: The requirement to produce a design submission as well as an as built submission, including a comparison of specifications, will hopefully bring more standardisation and rigour to the compliance checks. This would involve developers providing Building Control Bodies (BCBs) with a design-stage submission containing not just the SAP calculation but also the component specifications which the developer is going to use to deliver this result. This Key features list provided with the design stage submission will help to prioritise on site inspections. (The person that prepares the SAP calculation would be responsible for checking that the proposed component specification is consistent with the claimed energy performance.). A revised SAP calculation must be submitted if there are any changes to the original specification i.e insulation type or thickness, boiler type, windows etc then. BCBs should receive more detailed and accurate information at the design stage, to strengthen the ability to enforce the necessary Regulations. This would provide clarity to developers and architects at this vital stage in the construction process. By providing BCBs with more robust information as part of the Building Regulations submission, they will be more able to check compliance on site visits, and therefore, it is more likely that the finished property will mirror the as designed specification. It will strengthen their position and enable them to enforce and improve on some of the poorer construction standards. With professional energy assessors working in tandem with BCBs the consumer can have full confidence in both the finished building and the Energy Performance Certificate. 3) Reducing Thermal bridging/accredited Construction Details scheme: Amongst other measures that address the need to reduce CO 2 emissions, that of having better insulated buildings requires more sophisticated methods such as numerical modelling to calculate the heat loss caused by thermal bridging at wall, roof and floor junctions and around openings. In Part L 2006, it was acceptable to assume an effective U-value (the y value) of 0.08W/m 2 K if accredited construction details have been used. This will not be possible with Part L Instead, the length of each junction will need to be measured, multiplied by the appropriate psi values and added up to produce the y value. The psi values can either be values already supplied in the SAP 2009 document or supplied by the relevant approved government accredited construction detail scheme. (0.04 is the likely figure to meet compliance and standard details are being derived by BRE) With the Accredited Construction scheme developers would be required to register their use of accredited details in order to receive a unique reference number which they could input into SAP. The operators of the scheme would carry out random spot checks on a sample of developments to ensure that the accredited details were being used in practice. (Similar to current requirements for Part E Robust details). Conventions for Calculating Linear thermal transmittance and Temperature Factors (BR 497): This guide gives the conventions that should be followed by numerical modellers to produce consistent, reproducible results. For Building Regulation purposes two key modelling outputs, temperature factor and linear thermal transmittance, are identified. These key outputs will enable designers to confirm the adequacy of particular junction details and help with the development of novel solutions to improve the thermal performance of junctions. 4) Developer confirms as-built conforms to design submission: This would involve developers providing BCBs with an additional as built submission which will then require an additional as built SAP /Energy Certificate. The notion of confidence factors should start to reward those developers who adopt good quality control procedures both in design and on site. Straight talking solutions 5

6 Summary of Main Changes to Part L (2010) Design submissions are now part of the Regulation A design stage calculation and specification list submission to Building Control Bodies will be a mandatory requirement before building work takes place. Previously only the As-built calculation was a mandatory requirement. Party walls Plus their associated thermal bypass heat losses will be included for the first time in the calculations. You will need to insulate and seal your party wall cavity or use solid walls just to match the notional building. Thermal bridges Accredited Details scheme aimed at ensuring that developers only claim enhanced benefits in their SAP modelling by using approved accredited construction details which have actually been used (0.08 for accredited construction details is no longer an option) Swimming Pools New Indoor swimming pools will require a U-value for the basin walls and floor which should be no worse than 0.25W/m²K Air Permeability Further improvements on air tightness. Part L 2010 now requires double the number of pressure tests to meet compliance. Generally a value between 5.0 & 7.0 m 3 /(hm 2 ) will generally need to be achieved. A value of 15.0m 3 /(hm 2 ) can still be used in small developments but will tend to require improving further the performance of thermal envelope. Thermal Mass The heat capacity of the external and internal building fabric will be used in the calculation of TER & DER results. You will now have to define the internal walls, floors and ceilings along with any party walls. Increasing the effective thermal mass reduces the need for heating and cooling. However the rules for calculating heat capacity mean that items such as internal drylining, thermal lining and lightweight constructions will reduce your effective thermal mass. Fabric limits Maximum area weighted U-values have been improved from the 2006 standards. The area weighted U-values shown in Part L are maximum values and unlikely to be low enough to comply with CO 2 emissions requirements. U-Value Competency Rockwool is one of the first organisations to be approved under a new voluntary U-value and Condensation Risk Competency Scheme introduced by the British Board of Agrément (BBA) in association with the Thermal Insulation Manufacturers and Suppliers Association (TIMSA). The scheme was designed in response to a widely held belief that many U-value calculations submitted were inaccurate. This assumption has been supported by recent findings that SAP assessors are frequently given incorrect, incomplete or contradictory design information consequently there is a strong likelihood that the carbon emissions calculated under SAP may not be correct and the affected designs may not be compliant with Building Regulations. A study published in 2009 by the Energy Efficiency Partnership for Homes (EEPH) and the Department of Communities and Local Government (CLG) reported that, in 68% of the data sets examined, errors occurred in interpreting SAP conventions for a number of inputs; incorrect U-values were the most frequent source of input error*. To address this problem Rockwool, along with other TIMSA members have worked with the BBA to develop a competency scheme to promote and assist accurate, objective and consistent calculation of U-values and condensation risk within buildings. Registration under the Scheme provides reassurance to a specifier or user that the services or the data being provided by a scheme member has been subject to a rigorous independent assessment process. They can therefore be assured that this output is representative and reliable. Calculations provided by qualified Rockwool employees and those provided by Rockwool as whole are backed up by the BBA Competent Persons Logo, which signals to a customer that the data provided is credible. Rockwool have also established a quality control system that ensures that all U-value or condensation risk calculations undertaken by the company are carried out directly by a fully qualified competent person, thus complying with the Scheme s requirements. The use of correct U-values is fundamental to compliance with Building Regulations, determining heating and cooling costs for the building occupier and assessing environmental performance. Rockwool and the BBA encourage organisations that require U-value and Condensation risk calculations to obtain this information from suitably qualified companies. * EEPH / CLG Research into Compliance with Part L of the Building Regulations for New Homes Phase 2 Main Report v0.4 30/4/09 6 An introduction to Part L 2010

7 Influential Design Principals Always start with the building fabric. The foundation of compliance should be the building envelope. Compliance with the amended Approved Document is a complex matter with a significant number of design considerations that need to be addressed. For most new buildings it should be possible to achieve the requirements of Part L 2010 without the need to use renewable energy technologies. The primary factors that will determine compliance are shown in the illustration Building type & configuration Building Envelope U-values. Glazing area & orientation (solar gain) Thermal bridging (accredited construction details ) Heating & hot water storage: (fuel type,boiler & controls) Ventilation (natural/ mechanical A/C) Lighting (internal & external) Air tightness One of the main causes of heat loss from homes is air leakage. Straight talking solutions 7

8 Section 2 New Build Dwellings (ADL1A) New Dwellings As with the previous document the new Part L 2010 adopts a single compliance route based on the whole building energy performance approach. Therefore elemental U-values alone will not achieve the required 25% improvement factor. In addition to this and to avoid compliance being dependant on emerging technologies (such as renewable energy systems) the fabric limits have been strengthened to ensure that building elements achieve a high level of thermal insulation performance. The maximum area weighted U-values for walls improved from 0.35 to 0.30, For Roofs from 0.25 to 0.20, For Glazing and doors from 2.2 to 2.0 Party walls introduced at Remember that these are maximum values and significantly better fabric performances will be required to achieve the overall TER CO 2 targets. Method of compliance SAP 2009 (adopting the Flat Approach) Under the flat approach, compliance with Part L1A will be required to be demonstrated for each individual building type in a development. This will need to take into account size, orientation and dwelling type (semi, end of terrace etc). The 2010 Target Emissions Rate (TER) would be 25% below the 2006 TER. For new dwellings, the reduction in CO 2 emissions relative to the notional dwelling (2002 regulations) would increase the current 20% betterment to approximately 40%. This is equivalent to achieving Code for Sustainable Homes Level 3 for CO 2 emissions. Influential factors: In order to meet compliance, the following considerations will be need to be addressed at the design stage: Building type and configuration Building fabric U-values Glazing and orientation of building (solar gain) Thermal bridging details Space heating and hot water Ventilation natural or mechanical Lighting Air tightness of the building fabric 8 An introduction to Part L 2010

9 New build dwellings : U-value guide: Due to the complexity of the design issues within the new approved document there will not be a single fabric solution for all new build dwelling types. Designers and builders will find that compliance will only be achieved with a range of U-values as shown in the table below Table 1 below provides a reasonable assessment of the fabric U-values required to deliver a 25% reduction in carbon emissions for new build dwellings. The U-values shown have been determined using SAP 2009 software based on a number of different model house type designs. Section 2 Table 1 U-value guidelines for new dwellings Element Walls 2010 (25% CO 2 reduction) 0.27 to 0.24 W/m 2 K Recommend 0.25 for design purposes Pitched Roof ceiling line 0.16 to 0.13 W/m 2 K Pitched Roof rafter line 0.18 to 0.16 W/m 2 K Flat Roof or roof with integral insulation 0.18 to 0.16 W/m 2 K Ground Floors 0.20 to 0.15 W/m 2 K Party walls attached houses & flats Zero W/m 2 K In determining these U-values above other influential factors included the following: Air Permeability = 5 7m 3 /hr/m 2 Thermal bridging = 0.04 W/m 2 K (50% improvement on current default allowance) Party wall (semi detached units & flats) = Zero Window Av. U-value = 1.2 to 1.5 W/m 2 K Space heating = Gas Boiler 90% Low energy lighting = 100% Ventilation = Natural From a technical point of view, 2010 compliance can be achieved by improvements to the building fabric alone, without the need for renewable technology. Main changes to SAP 2009 (New build dwellings (ADL1A) There are a host of improvements to the SAP calculation methodology which will enable it to better reflect the performance of low energy buildings 1. A design stage calculation and specification list submission to Building Control Bodies will be a mandatory requirement before building work takes place. Previously only the As-built calculation was a mandatory requirement. 2. The TER and DER calculations will be calculated using SAP 2009 and will represent an additional 25% improvement on the previous regulations. Due to the significant number of changes to the calculation, do not automatically expect your previous Code Level 3 specifications or guidance to achieve a Building Regulations pass under the new system without major revisions. 3. Party walls and their associated thermal bypass heat losses are will be included for the first time in the SAP calculations. You will need to insulate and seal your party wall cavity or use solid walls just to match the notional building. It will be impossible to improve on a U-value of zero which forms the basis of the Notional building. 4. The introduction of the Emission Factor Adjustment EFA for heating and lighting will cause increased emissions for some fuels in the calculations. For example the EFA will effectively increases the CO 2 emissions from grid electricity by 22.5%, bulk LPG by 4.7%, heating oil by 3.4% and mains gas by 2% in the calculations Your choice of heating fuel has major implications on the CO 2 emissions of the dwelling. 5. Thermal Mass The heat capacity of the external and internal building fabric will now be used in the calculation of TER & DER results. You will now have to define the internal walls, floors and ceilings along with any party walls, floors and ceilings. Increasing the effective thermal mass reduces the need for heating and cooling. However the rules for calculating heat capacity mean that items such as internal dry lining, thermal lining and lightweight constructions will reduce your effective thermal mass and therefore increase your CO 2 emissions assuming U-values are unchanged. 6. You can now select up to 100% low energy lighting and take the corresponding savings in CO 2 emissions. Previously you were restricted to a maximum of 30%, which was the same as that used in the notional building, regardless of the percentage of low energy lighting that you may have designed into your scheme. 7. Fabric limits have been strengthened, maximum area weighted U-values for walls improved from 0.35 to 0.30, Roofs from 0.25 to 0.2, Glazing and doors from 2.2 to 2.0 and Party walls introduced at Remember that these are maximum values and are unlikely to be low enough to help you comply with the CO 2 emissions. Straight talking solutions 9

10 New Dwelling Case Studies Element Detached Semi-detached (Filled Party Wall) Semi-detached (Non-filled Party Wall) Mid terrace Mid floor flat Floor area > 118m 2 88m 2 88m 2 74m 2 43m 2 Roof u-value N/A Wall u-value Party wall u-value N/A Floor u-value N/A Window/doors u-value Gas boiler efficiency 90% 90% 90% 90% N/A Electric heat efficiency N/A N/A N/A N/A 100% Secondary heating None None None None Electric Design air permeability Thermal bridging y-value Hot water insulation (mm) Ventilation system Natural Natural Natural Natural Natural Low energy lighting 100% 100% 100% 100% 100% Thermal mass parameter Low TF medium medium medium medium Area Entries Roof heat loss area Wall heat loss area Party wall area Floor heat loss area Opening area Total external surface Renewables no no no no no Main Results TER DER * Pass/Fail Pass Pass Pass Pass Pass Notes: These assessments have been calculated using NHER SAP 2010 (preview ) to provide passes without the need for renewables. The house types shown are to be used as guidance purposes and may vary pending specific design concepts. Variations such as the Thermal mass parameter, air permeability and the introduction of renewables i.e solar water heating, will also impact on the results shown above. 10 An introduction to Part L 2010

11 Solutions that meet PART L1A without renewable energy generation. Working on the principal that meeting the requirements of Part L should start with the building fabric, the table on page 10 shows that it is quite possible to achieve compliance without the need for renewable energy technologies. Section 2 The examples shown clearly demonstrate that U-values for the building fabric will vary from dwelling type across a site. In all cases the building fabric U-values required are significant improvements on those being built to meet Part L 2006 but still within the boundaries of practical affordability. Obviously variation on the compliance model can be achieved by using different elements such as higher efficiency boilers for example. Section 5 (pages 18 to 21) of this guide provide a selection of some typical construction details to achieve the U-Values shown in this table. In these examples we have taken some standard house types and applied them to NHER SAP 2010 with the identified design criteria. In all cases compliance has been achieved a practical and cost effective manner. The effect of Party wall Bypass The two compliance models for the semi detached house show the huge impact that not filling the part cavity wall can have. In the first we have assumed that the party wall is a cavity wall which has been filled with mineral wool and sealed at the edges. The result being that a U-Value of just 0.25 is required for the external walls. In the 2nd example the cavity is unfilled but the edges remain sealed thus assuming the default U-value of 0.20 for the party wall. In this case compliance is achieved by moving the U-value of the external walls to 0.16 a huge increase in cost and wall thickness. Pages 12 and 13 explain the principals the Party Wall Thermal bypass effect in more detail. Air Tightness The limiting value for the air permeability of tested dwellings in Approved Document L1A remains as 10 m 3 /(h.m 2 ) at a test pressure of 50 pascals. However SAP 2009 will assume an air permeability of 7 m 3 /(h.m 2 ) in the notional dwelling and unless other energy saving measures are incorporated into the proposed dwelling, then a design air permeability of less than 7 m 3 /(h.m 2 ) may be required. In our examples on page 10 we have assumed an air tightness of 5 which we believe is achievable on a practical basis for both masonry and other forms of construction. Improving the airtightness of the building can have a significant effect on the fabric U-values. Thermal Mass In most cases we have assumed that the buildings are of a medium thermal mass which is indicative of traditional brick and block construction. The detached house example uses a low thermal mass parameter which is indicative of lightweight construction such as timber frame. Straight talking solutions 11

12 Party Wall Bypass Effect. Contrary to previous assumptions, party cavity-walls are not zero heat loss walls because air flow in the cavity provides a heat loss mechanism. Amendments to Part L1A 2010 of England and Wales s Building Regulations and Section 6 of Scotland s Building standards (domestic) have for the first time recognised that where party cavity-walls between connected buildings are untreated, considerable heat can escape through them. A key feature of SAP 2009 is that party walls with unfilled and unsealed cavities are assumed to have a U-value of 0.5W/m 2 K. In calculating the DER for a Dwelling, the party wall U-value to be assumed for the type of construction adopted is set out in table 2 below. Table 2 Party Wall Construction U-Value Solid 0.00 Unfilled cavity with NO effective edge sealing 0.50 Unfilled cavity with effective edge sealing around all exposed edges and in line with insulation layers in abutting elements Fully Filled cavity with effective edge sealing at all exposed edges and in line with insulation layers in abutting elements In applying the U-values in Table 2 it is important that where edge sealing is adopted, either on its own or in conjunction with a fully filled cavity, the sealing is effective in restricting air flow and is aligned with the thermal envelope. Although effective sealing may be part of a cavity barrier, which is provided in order to comply with Part B (Fire), a cavity barrier on its own may not be effective in restricting airflow. In order to claim a reduced U-value (0.2 or 0.0) it will be necessary to demonstrate that the design adopted is likely to be robust under normal site conditions. How it occurs Where outside air is able to flow into the party wall cavity a cold zone is created which results in heat flux through the wall sections on either side. The extent of which will depend on external conditions such as wind and temperatures which create a ventilation stack effect caused by the warmed air rising in the cavity to be replaced by cooler air drawn in from outside. These air movements can be significant and, if no steps are taken to restrict flows, the resulting heat losses can be large. Loft Space House A Roof Tiles Loft Insulation Roof Tiles Loft Space House B Loft Insulation A key feature of SAP 2009 is that party walls with unfilled and unsealed cavities are assumed to have a U value of 0.5W/m 2 K.The notional dwelling used in calculating the TER assumes a U-value for cavity party walls of ZERO (0.0W/m 2 K) First Floor House A Intermediate Floor Intermediate Floor Party Wall First Floor House B Ground Floor House A Ground Floor Slab Ground Floor House B Ground Floor Slab Cold External Air Infiltrating into Party Wall Cavity 12 An introduction to Part L 2010

13 Reducing heat loss from party walls The heat loss can be reduced by measures that restrict air movement through the cavity, by means of fully filling the cavity with mineral wool and by providing effective edge sealing around the perimeter walls. The extent to which heat loss can be reduced will be dependent on the detailed design and the quality of construction. The illustrations below (fig A and B) show the current solutions developed to achieve a zero U-value in the party cavity wall. For masonry party cavity-walls the use of blown mineral wool insulation, with a maximum density of 40kg/m 3 has been shown by site trials to eliminate heat loss through the wall without adversely affecting its acoustic insulation performance. For lightweight framed constructions such as timber frame, the preferred solution for the industry will be to use lightweight full fill slab or roll insulation built in as the wall construction proceeds. (Discussions are currently on going with timber frame system holders to develop testing programmes.) Section 2 Figure. A Masonry with Render and Plasterboard on Dabs External cavity flanking wall Sleeved, flexible, cavity barrier Party wall cavity 75mm (min) fully filled with injected Rockwool Energy Saver Party wall Block 100mm (min) each leaf, density 1350 to 1600 kg/m 3 Wall finish Gypsum-based board (nominal mass 8 kg/m 2 ) mounted on dabs on cement: sand render (nominal 8mm) with scratch finish, and typical mix 1:1:6 to 1:1/2:4. Render mix must not be stronger than background. Figure. B Timber Frame Without Sheathing External cavity flanking wall Flexible cavity barriers for fire, acoustic and thermal performance Party wall Width 240mm (min) between inner faces of wall linings. 60mm (min) spacing between studs (must not be bridged by any diagonal bracing) Interstud absorbent material Rockwool roll or batts, density 22 kg/m 3 to 60 kg/m 3 to the full stud depth Interframe absorbent material Rockwool roll or batts, density 22 kg/m 3 to 45kg/m 3, to fully fill the void between frames and be in full contact with the interstud absorbent material. It is important to site check the actual spacing between the frames and adjust the interframe absorbent material thickness accordingly Wall lining Further details along with comprehensive design advice can be found in the MIMA design guide: Preventing Thermal Bypasses in Party Separating Walls which can be downloaded from the mima website Acoustic Solutions With its combined thermal and acoustic properties, mineral wool insulation, such as Rockwool, has been proven to be an effective means of meeting this new challenge. Recent field trails have proven that masonry cavities fully filled with blown mineral wool insulation, not only helps to eliminate the heat loss but also meets the Robust Details acoustic performance. When considering fully filling the party cavity-wall the overall method of construction will influence the choice of solution. The introduction of requirements to eliminate the Party Wall Bypass Effect supports the drive to deliver real-life energy efficiency, closing the gap between designed and as-built performance. Rockwool, with MIMA, are actively involved in developing both built-in and retrofit Robust solutions to meet these new proposals. Straight talking solutions 13

14 Section 3 New Buildings OTHER than dwellings (ADL2A) New buildings other than Dwellings As with new dwellings, new build non dwellings also adopt a single compliance route based on the whole building energy performance approach Method of compliance New non-domestic buildings: will require an aggregate improvement of 25% in the energy efficiency standards using Simplified Building Energy Model (SBEM)2010.This approach reflects the fact that it is relatively straightforward in some building types to improve the energy performance by more than 25 per cent, whilst in other building types a 25 per cent improvement becomes much more difficult. For example, a warehouse that is mostly roof-lit would be different from an office which is side-lit or a building with no glazing such as a cinema. The buildings will be in zones so may combine different elements of the glazing definition. The Target Emissions Rate [TER] will vary based on what fuel is used so that most building will have comparable efficiency standards regardless of fuel used. There will no longer be an improvement factor; the software will generate a TER which the designer must equal or exceed. Air Pressure testing. All buildings must now be pressure tested, other than buildings less than 500m 2. The limiting value for the air permeability of buildings in Approved Document L2A remains as 10 m 3 /(h.m 2 ) at a test pressure of 50 pascals. However, the National Calculation Methodology will assume an air permeability of 5 m 3 / (h.m 2 ) in the notional building and unless other energy saving measured are incorporated into the proposed building, then a design air permeability of less than 5 m 3 /(h.m 2 ) may be required. 14 An introduction to Part L 2010

15 New Build Non Dwellings: U-value Guide There is no single solution which can be applied to all buildings. Construction specifications will vary depending on a wide range of criteria including the building type. It should be noted that natural lighting and artificial lighting can have an impact on the overall building fabric U-values. Table 3 provides indicative U-values for non domestic buildings which have been based draft CLG modelling using gas heating and the aggregate 25% approach. If a building fails its SBEM BER TER check, the most likely causes in order of probability are lighting, heating, auxiliary energy and hot water. Table 3* Element % Walls Roofs Ground Floors 0.25 to 0.24 W/m 2 K 0.20 to 0.16 W/m 2 K 0.22 to 0.20 W/m 2 K In determining these U-values above other influential factors included the following: Windows & doors = U =1.8 > 1.5 Air permeability = 5 m 3 /hr/m 2 Gas boiler efficiency = 90% Central mech ventilation =1.80 Multi-burner radiant system= 86% Section 3 * Table based on Draft CLG Modelling Software Due to the re-development of the SBEM calculation software, at the time of going to print, it has not been possible to provide clear solutions to meeting the requirements of Part L2A. We will publish more details on our website in due course. For further details please contact either Rockwool Technical services on Improve rain noise performance using Rockwool roofing solutions Often thermal insulation materials can be used to meet more than the thermal requirements of the Building Regulations. For example, rain can cause unacceptable levels of background noise during class, seriously impairing learning and concentration. The problem is particularly acute with lightweight roofing commonly used on school buildings. The issue has been recognised in BB93, as well as other best practice codes and guidelines. Rockwool insulated roofs, can help satisfy the relevant criteria for rain noise resistance, reverberation time and speech intelligibility. Try Rockwool s rain noise calculator at tested solutions to meet all BB93 requirements easy to use BRE Rain Noise calculator helps you find the solution for each classroom BRE test reports available on request can also be used to meet thermal, fire-stopping, light reflection and sustainability requirements the addition of a Rockfon ceiling system will further enhance the acoustic performance of the roof Straight talking solutions 15

16 Section 4 Work on Existing Buildings Dwellings (ADL1B) & Non-dwellings (ADL2B) Scope of works covered: Extensions Material Change of use & Change of energy status. Work on controlled fittings & Services. Renovation work Overview of Works for Extensions, Renovation & Repair work Compliance with the new Part L will be required when people elect to carry out work to existing buildings including extensions and conversions, fabric renovations, replacement windows and boilers As with new build, there is a general raising in building standards for existing buildings with more focussed guidance for thermal elements, replacement fittings, and heating systems. However, unlike new build, compliance can still be achieved by using an elemental U value approach as shown in the tables below (for greater flexibility a SAP/SBEM may also be used). Elemental U-values for Extension work. Reasonable provision for newly constructed thermal elements such as those constructed as part of an extension would be to meet the standards set out in Table 4 below (These also apply to existing non domestic buildings) Table 4 Summary of new fabric U values for new thermal elements Element 2010 Standards 2006 Standard Wall 0.28 W/m 2 K 0.30 W/m 2 K Pitched Roof ceiling line 0.16 W/m 2 K 0.20 W/m 2 K Pitched Roof rafter line 0.18 W/m 2 K 0.20 W/m 2 K Flat Roof or roof with integral insulation 0.18 W/m 2 K 0.20 W/m 2 K Floors W/m 2 K 0.22 W/m 2 K Swimming Pool basins 0.25 W/m 2 K N/A A lesser provision may be appropriate where meeting such a standard would create significant problems in relation to adjoining floor levels. The floor U-value for the extension can be calculated using the p/a of the whole enlarged building. For Large non domestic extensions L2B : where floor area of the extension is greater than 100m 2 and 25% of existing floor area :Treat as new build using SBEM methodology Windows For most existing buildings, the standard for new and replacement windows, is now expressed as a Window Energy Rating rather than a U-value, with the standard being raised by two grading bands (from E to C ). Typically U of 1.6W/m 2 K for dwellings compared to 2.0 W/m 2 K today. Please refer to table standards for windows and doors for existing dwellings and non dwellings in Part L1B and L2B 16 An introduction to Part L 2010

17 Upgrading retained thermal elements & Refurbishment in existing buildings (Dwellings & Non dwellings) This Applies to following work: Material alterations Where existing element becomes part of the thermal envelope where previously it was not. (Change of energy status) Renovation /refurbishment of thermal elements Section 4 Renovation work in relation to thermal elements. Renovation in relation to a thermal element means the process of stripping down the element to expose the basic structural components (brick, timber/metal frame, joists, rafters etc.) and then rebuilding to achieve all the necessary performance requirements. Renovation only applies where the area to be refurbished is greater than one of the following limits (smaller proportions being regarded as repairs): a) 50% of the surface of the individual element; or b) 25% of the total building envelope Table 5 Upgrading retained thermal elements & Refurbishment Element (a) Threshold U- value (b) Improved U- value Wall (cavity blown) W/m 2 K 0.55 W/m 2 K Wall (externally or internally insulated) W/m 2 K 0.30 W/m 2 K (was 0.35 in ADL 2006) Pitched Roof ceiling line 0.35 W/m 2 K 0.16 W/m 2 K Pitched Roof insulation between rafters 6 Flat Roof or roof with integral insulation W/m 2 K 0.35 W/m 2 K 0.18 W/m 2 K (was 0.20 in ADL 2006) 0.18 W/m 2 K (was 0.25 in ADL 2006) Floors 4, W/m 2 K 0.25 W/m 2 K 1 Roof includes the roof parts of dormer windows and wall includes walls of dormers 2 this applies only in the case of a wall suitable for installation of cavity insulation. Where this is not the case then it should be treated as wall - external or internal insulation. 3 A lesser provision may be appropriate where meeting such standards would result in a reduction of more than 5% in the internal floor area of the room bounded by the wall 4 A lesser provision may be appropriate where meeting such a standard would create significant problems in relation to adjoining floor levels. 5 The U-value of the floor of an extension can be calculated using the p/a of the whole enlarged building. 6 A lesser provision may be appropriate where meeting such standards would create limitations on headroom. In such cases the depth of the insulation plus any required air gap, should be at least the depth of the rafters and thermal performance of chosen insulant such as to achieve the best practical U-value. 7 A lesser provision may be appropriate if there are particular problems associated with the load bearing capacity of the frame or upstand height. Notes relating to Renovation Work and table 3 above Where a thermal element is subject to a renovation, the performance of the whole element should be improved to achieve or better the relevant U-value set out in column (b) of Table 3. If achievement of the relevant U-value set out in column (b) of Table 3 is not technically or functionally feasible or would not achieve a simple payback of 15 years or less the element should be upgraded to the best standard that is technically and functionally feasible. (Guidance on this approach is given in Appendix A. table A1 of ADL1B & L2B) ) Straight talking solutions 17

18 Section 5 New Build guide solutions External wall construction to achieve a U-value of 0.25 W/m 2 k Cavity walls Fully filled batts Masonry cavity External Walls Built in Compliance with all sections of Part L 2010 can be achieved with a variety of different constructions. Across the following pages we provide a small selection of building fabric solutions for both dwellings and non dwellings as well as new build and extensions. Further solutions are available from our brochure: Rockwool Guide to U-values which can be downloaded from our website at Masonry cavity External Walls: 102mm Face brick, : 110mm Rockwool Cavity full fill batts, 100mm Aircrete block (Lambda 0.15) Plasterboard on dab finish. (Build type Domestic & Non Domestic) Masonry cavity External Walls: Render on 100mm medium dense block 100mm Rockwool Cavity full fill batts, 100mm Aircrete block (Lambda 0.110) Plasterboard on dab finish (Build type Domestic & Non Domestic) Masonry cavity External Walls Retrofit (blown insulation) Masonry cavity External Walls:. 102mm Face brick, : 110mm Rockwool EnergSaver blown full fill 100mm Aircrete block (Lambda 0.110) Plasterboard on dab finish. (Build type Domestic & Non Domestic) Masonry cavity External Walls: Render on 100mm medium dense block 105mm Rockwool EnergySaver blown full fill 100mm Aircrete block (Lambda 0.110) Plasterboard on dab finish (Build type Domestic & Non Domestic) Solid walls RockShield render on 75mm RockShield slab, 215mm solid Aircrete block 3.6N (0.150) Plasterboard on dab finish (Build type Domestic & Non Domestic) BrickShield on 95mm Rockwool Facade Ultra 215mm solid Aircrete block 3.6N (0.150) Plasterboard on dab finish (Build type Domestic & Non Domestic) A wider range of constructions can be found in our Guide to U-values available from our website 18 An introduction to Part L 2010

19 Constructions options using Solid timber studs 15% bridging Construction 1: Solid 140mm stud 15% bridging 102mm Face brick, Tyvek Reflex HP breather membrane 9mm osb, 140mm std Timber frame*,140mm Flexi insulation fully filling studs. VCL & 12.5 plasterboard u-value 0.25 Construction 2: Solid stud with service zone 102mm Face brick, Tyvek Reflex HP breather membrane 120mm std Timber frame*,120mm Flexi insulation fully filling studs. Airguard HP VCL 25 mm battened service void,.12.5 plasterboard u-value 0.25 Ditto above using 140mm flexi in 140mm stud to give U-Value =0.22 Section 5 Construction 3: Hybrid frame U Value 0.25 (new build) Cavity wall with 30mm Rockwool HP partial fill on std Breather membrane on 9mm OSB on 120mm solid studs fully filled with 120mm Rockwool Flexi Std. VCL & 12.5mm P/board u-value 0.25 Ditto above using 140mm flexi in 140mm stud U-Value =0.22 Construction 4: Solid 140 stud Single Timber framed wall 15% bridging U-value 0.25 (with timber cladding or tile hanging) Cladding, Breather membrane, 9mm OSB 140mm Rockwool Flexi between 140mm solid timber stud. HP DuPont Altguard VCL, 25mm battened service zone 12.5mm plasterboard. (Build type Domestic): Timber Constructions options using TIMBER I studs 8.3% bridging Construction 1a: I stud 145 x 45 mm 102mm Face brick, Standard breather membrane 9mm osb, 145mm x 45 I stud 140mm Flexi insulation fully filling studs Standard VCL & 12.5 plasterboard U-value 0.25 (Ditto above using Tyvek Rolflex breather membrane) U-Value =0.22 Twin skin cladding systems Roof & Wall Ground Floors Roof Twin skin metal cladding) u= mm Rockwool Cladding roll (un-faced) (Build type non-domestic): Wall Twin skin metal cladding) u= > 200mm Rockwool Cladding roll (Foil faced) Thickness may vary pending system type (Build type non-domestic): U-value example based 0.18: Screed on 100mm concrete slab on 135mm Rockwool Rockfloor on dpm (Note thickness based on detached house 12x8m with P/A of 0.420) insulation thickness will vary pending floor area) into (Build type Domestic & non-domestic): Straight talking solutions 19

20 Section 5 New Build guide solutions Roof construction to achieve U-values of 0.16 or 0.13 W/m 2 k Pitched roofs horizontal insulation Pitched roofs horizontal ceiling u= % timber bridging Option1 rolls:u= mm Rockwool Roll (1layer of 100mm between joists plus 1 Layer 170mm Roll laid over joists Option 1a u=0.14: 200mm Roll over joists + 100mm between Option 1b u=0.13: 220mm Roll over joists + 100mm between Option 2 blown: u= mm Rockwool RockPrime blown loft insulation Option 2a blown: u= mm Rockwool RockPrime blown loft insulation Option 2b blown: u= mm Rockwool RockPrime blown loft insulation (Build type Domestic & non-domestic) Room in roof based on U-value 0.16 Room in roof: rafter line U= Rockwool Rockfall Warm pitched roof Insulation between & over rafter Rafters 600ctrs (7.8 % timber bridging) Tiles and battens,,breather membrane, 60mm Rockfall Overlay board over rafters 200mm RW Flexi between rafters, u = 0.16 standard VCL,.12.5mm p/board finish 80mm Overlay with 230mm ( mm) Flexi u= 0.13 (Build type Domestic & non-domestic) Flat roofs based on U-value 0.16 Single ply membrane 235mm (2 layer) Rockwool Hardrock DD on Metal deck (Build type non-domestic) Hybrid Timber Flat roofs based on U-value 0.16 (non vented) Hybrid Flat roofs u= % timber bridging Timber deck Single ply membrane on 105mm Hardrock on breather membrane on timber deck 140mm Rockwool Flexi between joists VCL and plasterboard finish (Build type domestic) 20 An introduction to Part L 2010

21 Minimising Cold Bridging Extensions & New build Window & Door Reveals Rockwool Fire rated cavity closers Reduces thermal heat loss, condensation & mould growth Section 5 RockReveal Masonry RockReveal Timber Frame 20mm thick Rockwool insulation Rockclose (insulated dpc) Rockclose 20mm thick RW 20mm thick Rockwool insulation Minimising Cold Bridging at Window & Door Reveals Accredited Construction Details guidance is available to assist the construction industry in achieving the performance standards in ADL. Around openings, such as windows and doors, Accredited Details provide the minimum requirements are for: Proprietry closer with minimum thermal resistance path of 0.45m²K/W. Rockwool offer two product types to address these requirements: Rockclose insulated dpc and RockReveal Both of these products will exceed this performance requirement advocated in accredited construction details E.g. 20mm thick Rockwool insulted DPC provides a thermal resistance path of 0.55m²K/W and 25mm thick To minimise cold bridging and to provide fire integrity at door and window reveals, fit Rockwool TCB cavity around door and window reveals To minimise air leakage, use flexible sealant around internal and external window and door frames and sills. Ensure that the vapour control layer and plasterboard are returned into reveal. Straight talking solutions 21

22 Section 5 Extensions guide solutions External wall construction to achieve a U-value of 0.28 W/m 2 k A wider range of construction can be found in our Guide to U-values available from our website Masonry cavity External Walls: 102mm Face brick, : 100mm Rockwool Cavity full fill batts, 100mm std 3.6N Aircrete block (Lambda 0.150) Light Plaster finish. (Build type Domestic & non-domestic): Render on 100mm medium dense block 95mm Rockwool Cavity full fill batts, 100mm std 3.6N Aircrete block (Lambda 0.150) Light Plaster finish. (Build type Domestic & non-domestic): Solid Walls RockShield render on 75mm Rock shield slab, 215mm solid Aircrete block 3.6N (0.150) Light Plaster finish (Build type Domestic & non domestic): BrickShield on 85mm Rockwool Facade Ultra 285mm solid Aircrete block 3.6N (0.150) Light Plaster finish (Build type Domestic & non- domestic): Single Timber framed wall With timber cladding or tile hanging Cladding, Breather membrane, 9mm OSB 140mm Rockwool Flexi between 140mm timber stud. STD VCL,25mm battened service zone 12.5mm plasterboard. (Build type Domestic): Ground Floors U-value 0.22 Screed on 100mm concrete slab on 110mm Rockwool Rockfloor on dpm (Note thickness based on extension size approx 5mx4m) insulation thickness would be reduced if floor area of whole building taken into (Build type Domestic & non-domestic): 22 An introduction to Part L 2010

23 Roof construction to achieve U-values of 0.16 or 0.18 W/m 2 k Pitched roofs horizontal Room in roof Section 5 Pitched roofs horizontal ceiling u=0.16 9% timber bridging Option1: 270mm Rockwool Roll (1layer of 100mm between joists plus 1 Layer 170mm Roll laid over joists Option 2: 270mm Rockwool RockPrime blown loft insulation (Build type Domestic & non-domestic): Room in roof: rafter line U= 0.18 Rockwool Rockfall Warm pitched roof Insulation between & over rafter Rafters 600ctrs (7.8 timber bridging) Tiles and battens,,breather membrane, 70mm Rockfall Overlay board over rafters, 140mm RW Flexi between rafters, Standard vcl & 12.5mm plasterboard finish (Build type Domestic & non-domestic) Insulation between rafters Twin skin metal cladding Roof & Wall Insulation between rafters only U= % timber bridging Tiles and battens, HP breather membrane, 200mm (2x100) Rockwool RWA45 (or 220mm Flexi) between rafters, Hp foil vcl, 25mm battened service zone,&.plasterboard finish to rafters. (Build type Domestic): Roof Twin skin metal cladding u= mm Rockwool Cladding roll (un-faced) (Build type non-domestic): Thickness may vary marginally pending cladding system type (Build type non-domestic): Wall Twin skin metal cladding) u= mm Rockwool Cladding roll (Foil faced) (Build type non-domestic): Thickness may vary pending system type Flat roofs (Metal deck) Hybrid Timber Flat roofs Flat roofs u=0.18 Single ply membrane on 210mm (2x105mm) Rockwool Hardrock DD on Metal deck (Build type non-domestic): Hybrid Flat roofs u= % timber bridging Single ply membrane on 65mm Hardrock on breather membrane on timber deck 140mm Rockwool Flexi between joists VCL and plasterboard finish. (Build type domestic): Straight talking solutions 23

24 Section 6 Insulating Pipes and Ducts The insulation of pipes and ducts is essential to minimise heat losses for heated systems and heat gains for cooled systems. For cooled systems, it is also important to ensure that the risk of condensation is adequately controlled. The new Approved Documents ADL1A, ADL1B, ADL2A and ADL2B rely on second-tier documents published by CLG to provide detailed information on the minimum provisions necessary to comply with the requirements of the Regulations. The Part L second-tier documents for pipe and duct insulation ADL1A and ADL1B Dwellings The Domestic Building Service Compliance Guide (2010) provides guidance on the means of complying with requirements for space heating systems and hot water systems in new and existing domestic buildings. ADL2A and ADL2B Buildings other than dwellings The Non-Domestic Building Service Compliance Guide (2010) provides guidance on the means of complying with requirements for space heating systems, hot water systems and cooling & ventilation systems in new and existing non-domestic buildings. Domestic heating compliance guide Compliance with approved documents L1A: new dwellings and L1B: existing dwellings Approved Documents ADL1A and ADL1B (2010) rely on second tier documents to provide detailed information on the minimum provisions necessary to comply with the requirements of the Regulations. The Domestic Heating Compliance Guide is a second tier document providing guidance on the means of complying with the requirements for space heating systems and hot water systems. Minimum provisions for insulation of pipes The minimum provisions shown below for the insulation of pipes are repeated in the Domestic Heating Compliance Guide for fuel types and heating systems as follows; Gas-fired primary and secondary space heating and hot water Oil-fired primary and secondary space heating and hot water Electric primary and secondary space heating and hot water Solid-fuel primary and secondary space heating and hot water Community heating Solar water heating Minimum provision In new systems pipes should, in the following cases, be insulated with insulation complying with the requirements of the Domestic Heating Compliance guide (in line with the maximum permissible heat loss indicated in the Supplementary Information column), and labelled accordingly: Primary circulation pipes for heating and hot water circuits should be insulated wherever they pass outside the heated living space or through voids which communicate with and are ventilated from unheated spaces Primary circulation pipes for domestic hot water circuits should be insulated throughout their length, subject only to practical constraints imposed by the need to penetrate joists and other structural elements All pipes connected to hot water storage vessels, including the vent pipe, should be insulated for at least 1m from their points of connection to the cylinder (or they should be insulated up to the point where they become concealed) If secondary circulation is used, all pipes kept hot by that circulation should be insulated For replacement systems, whenever a boiler or hot water storage vessel is replaced in an existing system, any pipes (in the situations above) that are exposed as part of the work or are otherwise accessible should be insulated with insulation complying with the requirements of the Domestic Heating Compliance guide (in line with the maximum permissible heat loss indicated in the Supplementary Information column), and labelled accordingly or to some lesser standard where practical constraints dictate. 24 An introduction to Part L 2010

25 Non-domestic heating, cooling and ventilation compliance guide Compliance with approved documents L2A: New Buildings other than Dwellings and L2B: Existing Buildings other than Dwellings Section 11 of the Non-domestic Building Services Compliance guide 2010 outlines the minimum provisions needed to comply with ADL2A and ADL2B when insulating pipes and ducts serving space heating, hot water and cooling systems in new-build and in existing buildings. Section 6 Pipework and duct insulation Approved Documents ADL2A and ADL2B rely on second-tier documents to provide detailed information on the minimum provisions necessary to comply with the requirements of the Regulations. The Non-Domestic is a second-tier document providing guidance on the means of complying with the requirements for space heating systems, hot water systems, cooling and ventilation systems. The insulation of pipes and ducts is essential to minimise heat losses for heated systems and heat gains for cooled systems. For cooled systems, it is also important to ensure that the risk of condensation is adequately controlled. Although not within the scope of the Non-domestic, guidance on controlling condensation is also provided in An introduction to Part L insulating pipes and ducts. a direct hot water pipes and low, medium & high temperature heating pipes b cooled water supply pipes c heated air ducts, cooled air ducts and dual-purpose heated & cooled air ducts d condensation control Maximum permissible heat loss (W/m) for direct hot water and heating pipes. Table 41 section 11 of Building services compliance guide (2010 Edition). Table 2: Maximum Permissible Heat Loss (W/m) (Thickness of Rockwool Rocklap H&V Pipe Section) Pipe Outside Diameter (mm) Hot Water 1 Low Temp. Heating 2 95 C Medium Temp Heating 3 96 C 120 C High Temp Heating C 150 C (25mm) 8.90 (25mm) (25mm) (25mm) (25mm) 9.28 (30mm) (30mm) (30mm) (30mm) (35mm) (40mm) (40mm) (30mm) (35mm) (45mm) (50mm) (30mm) (35mm) (50mm) (60mm) (35mm) (40mm) (50mm) (70mm) (35mm) (40mm) (60mm) (70mm) (35mm) (45mm) (60mm) (80mm) (35mm) (45mm) (60mm) (80mm) (40mm) (45mm) (70mm) (80mm) (40mm) (50mm) (70mm) (90mm) (40mm) (50mm) (70mm) (90mm) (40mm) (50mm) (70mm) (90mm) & above (40mm) (50mm) (80mm) (100mm) NOTES 1, 2, 3,4 To ensure compliance with maximum permissible heat loss criteria, proposed insulation thicknesses should be calculated according to BS EN ISO using standardized assumptions: 1 Horizontal pipe at 60 C in still air at 15 C 2 Horizontal pipe at 75 C in still air at 15 C 3 Horizontal pipe at 100 C in still air at 15 C 4 Horizontal pipe at 125 C in still air at 15 C Due to rounding up to the nearest commercially available thickness, the thermal performance required will be met or exceeded. Straight talking solutions 25

26 Section 7 BuildDesk Part L 2010 Solutions BuildDesk is an independent provider of energy design software, services and consultancy in the field of energy efficiency. Our products are designed to help Architects, engineers and building designers meet and exceed the requirements of the new Approved Building Regulation Part L (2010) documents. BuildDesk Software tools Our user friendly software tools are designed to allow you to quickly check your design proposals and generate supporting reports for Building Control. Our software tools include: BuildDesk U Our easy to use U-value calculator helps you to build up your own constructions and check them in 2D & 3D. With over 500 generic constructions and a comprehensive list of construction materials to choose from, you can quickly produce accurate U- value calculations. It comes with an integrated Condensation Risk analysis calculator which helps you to assessment your constructions for interstitial and surface condensation risk. New for the latest 2010 regulations, BuildDesk U now comes complete with an automatic Heat capacity calculation of your constructions. Heat capacities are now an important required in the latest SAP 2009 & SBEM calculations where they are used to establish the effective thermal mass of your building. More Information To keep up to date with Building Regulations, developments in sustainable construction and the latest news on forthcoming BuildDesk products and services visit us online at and register for our Newsletter. BuildDesk a member of the Rockwool Group. BuildDesk Carbon Checker Carbon Checker, our alternative to isbem, is designed for new and existing non-domestic buildings. This powerful design tool allows you to draw in, or trace the building geometry from your CAD drawings and make quick changes to the design. Carbon Checker is much more user friendly and useful when carrying out rapid assessments of buildings for Building Regulations, from design submissions to as-built, including the final Energy Performance Certificate. All our software products are available for a free trial. Just visit the our software section our website at BuildDesk Services & Consultancy As a complement to our software tools we offer a range of services from calculation assistance including thermal bridging analysis; to hands-on software training courses and CPD accredited seminars. 26 An introduction to Part L 2010