Section 6 (Scotland) (2005) Methods (non-dwellings) <Virtual Environment> 5.9

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1 Section 6 (Scotland) (2005) Methods (non-dwellings) <Virtual Environment> 5.9 Page 1 of 21

2 Contents 1. Acknowledgements Introduction Basis for calculations Section 6 Elemental and Heat Loss Methods (including building services requirements) Carbon Emissions Calculation Method Additional Section 6 Requirements References...21 Page 2 of 21

3 1. Acknowledgements Extracts from the following documents are reproduced with permission: Scottish Executive. Technical Standards for compliance with the Building Standards (Scotland) Regulations 1990, as amended. Crown Copyright ISBN X. Page 3 of 21

4 2. Introduction Methods for demonstrating compliance with The Building Standards Regulations (2002) Part J Conservation of Fuel and Power are set out in The Scottish Building Standards Agency s Domestic and Non-Domestic Handbooks May 2005 [0] (Section 6), the Scottish Executive s Technical Standards document [1] and related publications. This manual describes how the methods described in the Technical Standards document are implemented within the <Virtual Environment> for the assessment of buildings other than dwellings. Paragraph numbers in this manual refer to the Technical Standards document. The 2005 Section 6 regulations introduced minor revisions to the previous (2002) Part J regulations. These revisions have been incorporated into the IES software, though in this document and in the results files some of the Part J terminology has been retained. An outline of the Section 6 regulations is provided in the Section 6 (Scotland) User Guide. The Technical Standards document should be consulted for a detailed account of the Part J provisions. Copies of the relevant sections are provided with the Section 6 software. The broad requirements of Section 6 are set out in Regulation 22: 22.(1) In a building to which this regulation applies, reasonable provision shall be made for the conservation of fuel and power. (2) This requirement shall apply to all buildings, other than (a) a building which is unheated or which has a space heating for protection against frost designed to give a maximum output not exceeding 25 Watts per square metre of floor area; or (b) unheated parts of a building of purpose sub-group 1A that do not form part of a dwelling. Routes to compliance are outlined in the section of Section 6 headed Compliance with the Regulations : Page 4 of 21

5 Without prejudice to any other way of meeting the standards, complying with the provisions that are deemed to satisfy the requirements of the regulations, as given in this document, constitutes compliance. To satisfy the regulations therefore the design, materials and methods of construction must be at least to the standards set in this publication. The provisions deemed to satisfy the standards are provided for the convenience of designers only if they choose to adopt them. There is no obligation to do so, but if used properly deemed to satisfy solutions must be accepted by the local authority. Not all the requirements of Section 6 can be tested in software. However, IES is in the process of developing software covering all requirements that can be so tested. Page 5 of 21

6 3. Basis for calculations 3.1. Building Types The building must be assigned a type for the purposes of Section 6, for example Office. This affects the methods available for showing compliance and the requirements that must be met Rooms to be Included in the Analysis Analysis is carried out for all rooms for which the box Include room in Building Regs analysis? is ticked. Other rooms, including rooms in inactive layers, may play a part in the analysis by providing boundary conditions for rooms that are included: if such a room is adjacent to an included room, there is assumed to be no heat loss through the partition. By including only certain rooms it is possible to perform Section 6 analysis on part of a building or a building that forms part of a multi-building model Room Types Each included room must be assigned a type indicating whether it is heated and whether it falls into any special category such as Unheated space with pitched roof and insulation between rafters or Glazing cavity. Unheated rooms (those of type Unheated space with pitched roof and insulation between rafters, Unheated space with pitched roof and insulation between joists, Glazing cavity and Unheated space or space with low level (<= 25W/m2) of heating ) feature in the analysis as pathways for heat loss from heated rooms (see ADL2 paragraph 0.12). Such rooms must be assigned a ventilation rate to allow the heat loss calculation to be performed by the method set out in BS EN ISO 13789:1999 [2] (see paragraph J2.3b). Rooms that do not have controlled heating but are nonetheless heated incidentally should be assigned the type Heated space. Examples of rooms in this category are plant rooms, lift-wells, untreated store rooms, and ceiling voids. Page 6 of 21

7 3.4. Unheated Rooms Partitions between heated rooms and unheated rooms ( semi-external elements ) are treated as heat-loss elements with a U-value derived from a generalisation of the transmission heat loss coefficient calculation method [2]. This generalisation extends the method to cover the case of unheated rooms that have adjacencies to more than one heated room. A heat loss network is solved to obtain transmission heat loss coefficients from each heated room to the outside via the unheated room or rooms. Where there is only one adjacent heated room (the most common case in practice) the method is equivalent to the transmission heat loss coefficient method. An exception to this rule is applied where an unheated room has no conduction heat loss path to the outside, either directly or via other unheated rooms. In this case partitions between the room and adjacent heated rooms are treated as internal elements Basis for Calculating Areas In accordance with paragraph J2.5, element areas used in the Section 6 calculations are measured between finished internal faces of the external elements of the building. These areas are calculated automatically from the building geometry and the element thicknesses as defined in APcdb. The figure for Floor area (heated rooms) displayed at the top of the Section 6 results file is total internal floor area summed over heated rooms, excluding those of less than 1.5m height (for example ceiling voids) Basis for Calculating U-values U-values are defined in accordance with the conventions set out in the appropriate BS EN ISO standards. The APcdb interface displays both CIBSE and BS EN ISO U-values. When creating constructions in APcdb, allowance should be made for the effects of heat bridging and the geometry of ground floors. These features are currently not catered for in the APcdb interface, but are scheduled for inclusion in the near future. Page 7 of 21

8 3.7. Glossary The following terms are used in this manual: Element - a wall, partition, ceiling, roof, floor, door, window or rooflight. Opening - a door, window or rooflight. Non-opening element - a wall, partition, ceiling, roof or floor. Glazing opening - a window or rooflight. Environment-exposed element - an element exposed to the external environment. Link-exposed element - an element linking to the external environment or the ground via one or more unheated spaces. Exposed element - an environment-exposed or link-exposed element. Earth-contact element - an element in contact with the ground. Heat-loss element - an exposed or earth-contact element bounding a heated space. Solar-exposed glazing opening - a glazing opening that is environmentexposed or links to a glazing cavity (does not include glazing openings linking to other types of unheated space). Roof - an environment-exposed non-opening element with a slope less than 70 degrees, or a link-exposed ceiling, or any link-exposed element adjacent to a room of type Unheated space with pitched roof and insulation between joists/rafters. Rooflight - an environment-exposed glazing opening with a slope less than 70 degrees or a link-exposed ceiling window, or any link-exposed glazing element adjacent to a room of type Unheated space with pitched roof and insulation between joists/rafters. Page 8 of 21

9 4. Section 6 Elemental and Heat Loss Methods (including building services requirements) 4.1. E 1. Fabric Requirement (paragraphs J8.2-J8.6 & J9-J14) E 1.1 Elemental Method (paragraphs J8.2-J8.4) "To comply with this method the building envelope must provide minimum levels of thermal insulation as set out in J8.3 and areas of windows, doors and rooflights as set out in J8.4." (Part J, paragraph J8.2) E U-value (Table J8.3) Requirement (paragraphs J8.3) "The individual specified building elements must have U-values in accordance with the table to this standard." (paragraph J8.3). For each heated room, all heat-loss elements are subjected to the U-value checks set out in paragraph J8.3. The Table 8.3 category Pitched roof with insulation between rafters is applied to ceiling elements linking to rooms of type Unheated space with pitched roof and insulation between rafters. The Table 8.3 category Pitched roof with insulation between joists is applied to ceiling elements linking to rooms of type Unheated space with pitched roof and insulation between joists. Ceilings linking to other types of unheated space, and roof elements, are treated as Flat roof or roof with integral insulation. In the case of windows, roof windows and personnel doors the check is applied to an areaweighted average U-value for the whole building. The U-value requirement in Table 8.3 depends on the type of frame (metal or wood/pvc). In cases where there is a mixture of frame types the required U-value is set to the value appropriate to the type of frame accounting for the greater overall area, as stipulated in a reply posted on the Part L FAQ website [3]. Display glazing, as specified by the check-box in APcdb, is not excluded from the Table 8.3 checks (contrary to the treatment in Part L (England & Wales)). Vehicle access and similar large doors, as specified by the check-box in APcdb, form a special category in Table 8.3 with U-value limit 0.7 W/m 2 K. Page 9 of 21

10 Elements defined as walls in ModelIT are treated as roofs if they have a slope less than 70 degrees, and elements defined as roofs in ModelIT are treated as walls if they have a slope greater than or equal to 70 degrees. The same principle applies to windows and rooflights. For link-exposed elements, Table 8.3 note 1 offers two options. The software always applies EN ISO 13798:1999 (the less stringent requirement) E Maximum Window/Door/Rooflight Area (Table J8.4) Requirement (paragraph J8.4) "The specified building elements must have areas of windows, doors and rooflights not more than those prescribed in the table to this standard" (Part J, paragraph J8.4). In accordance with paragraph 8.4, checks are performed on the total areas of heat-loss windows, doors and rooflights in heated rooms. A heat-loss element is any environmentexposed, link-exposed or earth-contact element. The percentage figure for windows and doors is calculated as the total area of heat-loss windows (excluding display windows) and doors (excluding vehicle access and similar large doors and any doors used to represent wall or roof elements) divided by the overall wall area above ground level, which is calculated as the sum of the areas of all heat-loss walls, windows and doors excluding earth-contact walls but including all types of window and door. Earth-contact walls are excluded from the area calculation in accordance with a ruling posted on the Part L FAQ website3. Earth-contact walls are identified as walls with adjacency type Outside air with offset temp. or Temp. from profile. Any windows and doors with these adjacency types are also classified as earth-contact walls. The percentage figure for rooflights is calculated as the total area of rooflights (including any link-exposed ceiling windows) divided by the overall roof area, which is calculated as the total area of roofs and rooflights excluding earth-contact ceilings but including any linkexposed ceiling windows and display rooflights. Earth-contact ceilings are identified as ceilings with adjacency type Outside air with offset temp. or Temp. from profile. Any rooflights with these adjacency types are also classified as earth-contact ceilings. Any rooflight assigned a display window glazing type is treated as an ordinary rooflight. Buildings of type Hospital are placed in the category Residential buildings (where people temporarily or permanently reside) that is, buildings in Purpose Group 2. Buildings of type School are placed in the category Places of assembly, offices and shops that is, buildings in Purpose Groups 4 & E 1.2 Heat Loss Method (paragraphs J8.5-J8.6) E Overall Building Heat Loss Requirement (paragraph J8.5) Page 10 of 21

11 "When using this method - a. the total rate of heat loss through the envelope of the proposed building must not be more than that from a notional building of the same size and shape designed to comply with the Elemental Method..." (Part J, paragraph J8.5). "When comparing the proposed building with the notional building a. if the U-value of the floor next to the ground in the proposed building is less than that required by J8.3, with no added insulation, then the lower value must be used in the notional building: and... c. a maximum of half of the permitted rooflight area can be converted into an increased area of window and doors." (Part J, paragraph J8.6). Clause 8.5c causes some difficulty. The equivalent clause in Part L (England and Wales) is clarified by an example in ADL2 Appendix E, which makes clear that (at least in Part L) this requirement is more stringent than a literal reading might suggest, and is to be interpreted as c) no more than half of the allowable rooflight area can be converted into an increased area of window and doors or traded off in any other way (for instance against glazing U- values). It is thus equivalent to the following constraint on the notional building: "The area of rooflights in the notional building should not exceed that in the proposed building by more than half the Table 8.4 allowance (that is, by more than 10%)". This is the interpretation applied in the software for both Part L & Section 6. However, it is inconsistent with the example given in Part J Appendix H, which appears to ignore clause J8.5c. The constraints on floor U-value and glazing/door area are applied by the software when setting the properties of the notional building, and their effect can be seen in the tables presented in the results file. Display windows are subject to the same U-value constraints as other windows and doors. Paragraph 8.6b is dealt with as a separate requirement (see below). The area of vehicle access and similar large doors in the notional building is set equal to the area of such doors in the proposed building, since Table J8.4 imposes no area limit in this case. The same principle applies to display glazing. In accordance with Table J8.3, the U-value for vehicle access doors is set to 0.7 W/m2/K in the notional building. The apportioning of area between personnel doors and windows in the notional building makes no difference to the heat loss characteristics. However, the rule applied is that the area of personnel doors in the notional building is normally set equal to the area of such doors in the proposed building, any adjustments being made to window area. The only exception to this rule would be in the unlikely event that personnel doors alone accounted for more than the Table J8.4 allowance. Page 11 of 21

12 The comparison between the proposed building and the notional building appears in the results file as a table showing areas, average U-values and heat loss coefficients for each category of heat-loss element. Average U-values for the proposed building (Uact) and for the notional building (Uref) may be read off from the bottom of the table. A separate table displays, for the proposed and notional buildings, the window/door area percentage for the walls and the rooflight area percentage for the roofs. Finally, Ureq is compared with the average U-value for the proposed building (Uact) E Maximum Traded-off U-value (Table J8.5) Requirement (paragraph J8.5) "When using this method... b. the U-value of any building element must not be more than that shown in the table to this standard." (Part J, paragraph J8.5). These checks follow the same pattern as those described in section E U-value (Table J8.3) Requirement, but apply only to roofs, walls and floors E Average Traded-off U-value Requirement (paragraph J8.6b) "When comparing the proposed building with the notional building b. if the total area of windows, doors and rooflights in the proposed building is less than the total area required by J8.4, then the average U-value of the roof, wall or floor cannot exceed the appropriate value given in the Table to J8.3 by more than 0.02 W/m2K." (Part J, paragraph J8.6). A calculation is carried out to determine the maximum allowable area of heat-loss openings (windows, personnel doors and rooflights) permitted by the Table J8.4 requirements. If the actual area of heat-loss openings is less than this figure, the average U-values of the roofs and heat-loss walls and floors are checked against the appropriate Table J8.3 values plus 0.02 W/m2K. In the table displaying element categories failing this test, the category Flat roof or roof with integral insulation includes any earth-contact ceilings, and the category Wall includes any earth-contact walls E 2. Thermal Bridging and Air Infiltration Requirements (paragraphs J9.1 & J10.1) "The building's fabric must be constructed to minimise thermal bridges and gaps in the insulation layer(s)..." (Part J, paragraph J9.1). "The infiltration of air into a building through extraneous air paths must be limited as far as is reasonably practical." (Part J, paragraph J10.1). Page 12 of 21

13 These requirements cannot be analysed in software, but reference is made to them in the results file for reasons of completeness E 3. Heating Systems Requirements (paragraphs J11.1-J11.7) "The heating system of a building must be designed and installed to make efficient use of energy for the conservation of fuel and power." (Part J, paragraph J11.1) E 3.1 Heating Systems Carbon Intensity Requirement (paragraph J11.1) "The requirements of J11.1, as regards the efficiency of the boiler or other primary heat source, will be met - a. where the rating-weighted average carbon intensity of the boiler or other primary heat source is in accordance with Table 1 to this standard; or b. in the case of a liquid or gaseous fuelled boiler only, by compliance with the Boiler Efficiency Regulations 1993 and 1994" (Part J, paragraph (J11.1)) (Option b is not covered by the software.) The Heating Systems analysis performed by the software is based solely on the data entered via the Heating Systems tab of Building Regs Building & System data. Results are presented both in the interface and in the Part J results file. The interface provides facilities for specifying one or more heating systems and describing their characteristics. It also displays the Part J analysis results for the currently defined set of systems. Equation 1 to (J11.1) provides the basis for the analysis: A = B / C where: A B C is the carbon intensity of the heating system (kgc/kwh of useful heat) is the carbon emission factor of the fuel (kgc/kwh of delivered fuel) (see Table 2 to (J11.1)) is the gross thermal efficiency of the heating system (kwh of heat divided by kwh of delivered fuel) In the case of heating provided by combined heat and power, equation (2) to (J11.1) applies: Page 13 of 21

14 A = (B / D) (F / E) where: A B D fuel) E F is the carbon intensity of the heating system (kgc/kwh of useful heat) is the carbon emission factor of the fuel (kgc/kwh of delivered fuel) (see Table 2 to (J11.1)) is the heat output ratio of the CHP engine (kwh of heat per kwh of delivered is the electrical output ratio of the engine (kwh of electricity per kwh of delivered fuel) = kgc/kwh is the carbon emission factor for grid supplied electricity The software extends the treatment (in line with Part L) to cover cases where there is more than one heating system. In such cases the expression for the mean carbon intensity of the heating systems becomes a weighted sum over all the heating systems in the building: A mean = (1/ΣP) Σ(P A) where: A is the mean carbon intensity of the heating systems (kgc/kwh of useful heat) P is the percentage of total building heating at either 30% or 100% design capacity A is the carbon intensity of each contributing heating system (kgc/kwh of useful heat) These equations are used to calculate carbon intensity values for the heat generating equipment working at a) the design capacity of the heating system and b) 30% of the design capacity. The carbon intensity values are then compared with entries in Table 1 to (J11.1) to generate: a) a pass/fail result based on the performance at design capacity. b) a pass/fail result based on the performance at 30% of design capacity. c) an overall pass/fail result. Table 1 to (J11.1) gives maximum allowable carbon intensities at design capacity and 30% of design capacity for: 1. Natural gas, 2. Other fuels. In cases where more than one heating fuel is used, an average of the values in Table 5 is used, weighted by system output at design capacity or 30% design capacity as appropriate. Page 14 of 21

15 E 3.2 Heating Controls Requirements (paragraphs J11.2-J11.5) The requirements on heating controls are set out in paragraphs J11.2-J11.5. These requirements cannot be analysed in software but are included for completeness E 3.3 Insulation of Pipes, Ducts & Vessels Requirement (paragraphs J11.6-J11.7) The requirements on the insulation of pipes, ducts and vessels are set out in paragraphs J11.6-J11.7. These requirements cannot be analysed in software but are included for completeness E 4. Lighting Systems Requirements (ADL2 paragraphs J12.1- J12.3) "A building provided with artificial lighting must have general purpose artificial lighting systems designed to make efficient use of power, except - a. emergency lighting; and b. specialist process lighting; and c. buildings with a floor area not more than 100m 2." (paragraph J12.1). Lighting system requirements are not analysed by the current Part J software implementation E 5. Building Services (Air-conditioning, Mechanical Ventilation) Requirement (paragraph J13.1) "A building incorporating air conditioning or mechanical ventilation must be designed and constructed so that - a. the form and fabric of the building do not result in a requirement for excessive installed capacity of cooling equipment; and b. fans, pumps, refrigeration equipment and other components are reasonably efficient and appropriately sized to have no more capacity for demand and standby than is necessary; and c. there are appropriate means of managing, controlling and monitoring the operation of equipment and systems." (paragraph J13.1) E 5.1 Office CPI Method (paragraph (J13.1) & Appendix G) "The requirements of J13.1, for energy efficiency of air conditioning and mechanical ventilation will be met - a. for buildings of purpose group 3, by Page 15 of 21

16 achieving a Carbon Performance Index of at least 100, or in the case of a conversion, at least 90...' (Part J, paragraph (J13.1)) The CPI Method applies only to offices (buildings in Purpose Group 3). For the method to be applied the building type must be set to Office and the check-box Include Office CPI Method must be ticked. The data required by the Office CPI Method is entered via the tabs Office CPI Mech Vent and Office CPI Air Cond in the Part J Building & System Data dialogue. If both mechanical ventilation and air conditioning are used in the building, compliance must be demonstrated for both systems. Results from the analysis are displayed in boxes at the bottom of the data input tabs and are updated as the input data is edited. The calculation of a CPI value involves first calculating a Carbon Performance Rating (CPR) as a sum of contributions of the form: CPR = P x H x C x F where: P = Input power rating of the plant (kw/m 2 for the calculation, but W/m 2 for data entry) H = Number of hours per year that the plant operates (standard values assumed) C = Conversion factor for the fuel used (kgc/kwh) F = Factor depending on provisions made to control and manage the installed plant Parameter P forms part of the input data. Part J Appendix K provides detailed procedures for setting parameters H, C and F. The CPI rating is calculated as a constant divided by the Carbon Performance Rating. To pass the Part J checks the CPI rating must exceed a given value E 5.1(MV) Office CPI Mechanical Ventilation Requirement (paragraph (J13.1) & App. K) The method is set out in Part J paragraphs (J13.1) and Appendix K, from which the following extracts are taken: "The assessment is based on the calculation of a Carbon Performance Index using the following relationship: CPI(MV) = MV / (PD x HD x CD x FD) Page 16 of 21

17 where the value of the factor MV=800 has been set so that the design is considered to represent acceptable practice where the result of the calculation is 100 or greater" (paragraph K2.1) "... or in the case of a conversion, at least 90' (paragraph (J13.1)) The suffix D refers to plant for air distribution E 5.1(AC) Office CPI Air-Conditioning Requirement (paragraph (J13.1) & App. K) The method is set out in ADL2 paragraphs (J13.1) and Appendix K, from which the following extracts are taken: "The assessment is based on the calculation of a Carbon Performance Index using the following relationship: CPI(ACMV) = ACMV / (PD x HD x CD x FD + PR x HR x CR x FR) The value of the factor ACMV=1200 has been set so that the design is considered to represent acceptable practice where the result of the calculation is 100 or greater" (Part J, paragraph K2.2) "... or in the case of a conversion, at least 90' (Part J, paragraph (J13.1)) The suffixes D and R refer to plant for air distribution and refrigeration, respectively E 5.2 Methods for other buildings with ACMV (ADL2 paragraphs ) The requirements of J13.1, for energy efficiency of air conditioning and mechanical ventilation, will be met - b. for buildings of purpose groups 2 and 4 to 7, by providing air conditioning or mechanical ventilation with a total specific fan power (i.e. the design power of all fans in the distribution system divided by the design ventilation rate through the building) not greater than 1.5 W/ls -1. These requirements are not analysed by the software. Page 17 of 21

18 5. Carbon Emissions Calculation Method The Carbon Emissions Calculation Method involves a deeper level of analysis than the two preceding methods. The comparison of carbon emissions for the actual and notional buildings must normally be performed using simulation, and tools for this are provided elsewhere in the <Virtual Environment>. However, certain requirements of the Carbon Emissions Method can be tested in a straightforward manner, and these requirements are included within the automated Part J analysis C 1. Carbon Emissions Requirement The requirements of the Carbon Emissions Method are set out in Part J paragraphs J8.7, J8.8, J91, J10.1 and J14.1. Paragraph J8.7 states "To comply with this method the thermal insulation of the fabric and the efficiency of the building services systems must be such that the annual carbon emissions from the building are not more than from an equivalent notional building designed to comply with the Elemental Method; except - when using this method the standards for building services systems in J11, J12 and J13 may be ignored." Tools for calculating carbon emissions based on simulated performance of the actual and notional buildings over a typical year are provided elsewhere in the <Virtual Environment>. The notional building must be shown to comply with the Elemental Method in respect of insulation, air infiltration and lighting requirements. The Part J software can be used for this task C 2. Maximum U-value (Table J8.8) Requirement (paragraph J8.8) "When using this method the U-value of any building element must be in accordance with the table to this standard.." (Part J, paragraph J8.8). Page 18 of 21

19 The Carbon Emissions Calculation Method imposes certain limits on the U- values of roofs, walls and floors. These checks are the same as those applied in the Heat Loss Method C 3. Thermal Bridging and Air Infiltration Requirements (paragraphs J9.1 & J10.1) "The building's fabric must be constructed to minimise thermal bridges and gaps in the insulation layer(s)..." (Part J, paragraph J9.1). "The infiltration of air into a building through extraneous air paths must be limited as far as is reasonably practical." (Part J, paragraph J10.1). These requirements cannot be analysed in software but are included for completeness C 4. Building Services Commissioning Requirements (paragraph J14.1) "The building services installation required to comply with this Part must - a. be capable of operating at the manufacturer's specified efficiency; and b. incorporate adequate provisions for testing and commissioning to be carried out satisfactorily." (Part J, paragraph J14.1). "Written information must be provided for the building's occupier on the installed building services plant and controls required to comply with this Part, their method of operation, maintenance requirements, and details forecasting annual energy consumption for the building." (Part J, paragraph J14.2). These requirements cannot be analysed in software but are included for completeness. Page 19 of 21

20 6. Additional Section 6 Requirements Paragraph 8 of the Introduction to the Technical Standards document [1] stipulates that Part J should be read in conjunction with Part G (condensation), Part H (sound insulation) and Part K (ventilation), and refers to further documents covering these topics. Page 20 of 21

21 7. References 0. Domestic Handbook (Section 6), Non-Domestic Handbook (Section 6) The Scottish Building Standards Agency, May Scottish Executive. Technical Standards for compliance with the Building Standards (Scotland) Regulations 1990, as amended by the Building Standards (Scotland) Amendment Regulations 1993, the Building Standards (Scotland) Amendment Regulations 1994, the Building Standards (Scotland) Amendment Regulations 1996, the Building Standards and Procedure Amendment (Scotland) Regulations 1999, and the Building Standards Amendment (Scotland) Regulations Crown Copyright ISBN X. Free download available at: 2. BS EN ISO 13789:1999 Thermal performance of buildings Transmission heat loss coefficient Calculation method. 3. Part L Answers to your frequently asked questions: 4. DTLR. The Building Regulations Conservation of fuel and power. Approved Document L2 Conservation of fuel and power in buildings other than dwellings Edition. The Stationery Office. Free download available at: Page 21 of 21