The Building Regulations Part L Conservation of Fuel & Power 2013 Edition

Transcription

1 The Building Regulations 2010 Part L Conservation of Fuel & Power 2013 Edition

2 Without looking into the technical input for SAP etc (subject to a further presentation), what does it mean in practical terms for Building Control Bodies and their clients? An overview of the revised Approved Documents and requirements of The Building Regulations 2010 How to comply with Part L 2013

3 Parts L1A & B Dwellings 2013 Edition 2010 Edition will continue to apply to work begun before 6 th April 2014, OR to work subject to an application submitted before 6 th April 2014

4 Applicable regulations; 23 Requirements relating to thermal elements 24 Methodology of calculation of the energy performance of buildings 25 Minimum energy performance requirements for buildings (a) Target C0 2 emission rates TER (b) Target fabric efficiency rates TFEE 25a Consideration of high-efficiency alternative systems for new buildings

5 26 Minimum energy performance requirements for buildings 26A Fabric efficiency rates for new dwellings 27 C0 2 emission rate calculations 27A Fabric energy efficiency rate calculations 28 Consequential improvements to energy improvements 29 Energy performance certificates 40 Information about use of fuel and power 43 Pressure testing

6 New requirement Regulation 26A Requires new dwellings to achieve or better the target fabric energy efficiency (TFEE) in addition to the carbon dioxide target (TER) The Part L 2013 specifications will deliver 6% carbon dioxide savings across the new homes build mix relative to 2010

7 If a dwelling is constructed entirely to the notional specifications in the Approved Document, it will meet the carbon dioxide and fabric energy efficiency targets and the limiting values for individual fabric elements and building services. Developers can vary the specification provided the same overall level of carbon dioxide emissions and fabric energy efficiency performance is achieved or bettered

8 The Approved Document consolidates the amendments made in December 2012 requiring the feasibility of highefficiency alternative systems to be taken into account before construction commences Regulation 25B Nearly zero-energy requirements for new buildings will not come into force until 2019 at the earliest

9 The requirement of L1 is continued, with the exception that para (c), provision of information, is deleted Demonstrating compliance with the energy efficiency requirements could be demonstrated by meeting the five identified criteria set out in the Approved Document

10 Criterion 1 The Dwelling Emission Rate (DER) must not be greater than the Target Emission Rate (TER), and, The calculated Dwelling Fabric Energy Efficiency (DFEE) must not be greater than the Target Fabric Energy Efficiency (TFEE)

11 The Target CO 2 Emission Rate (TER) and Target Fabric Energy Efficiency (TFEE) Rate are the new minimum energy performance requirements for a new dwelling in accordance with Regulation 25

12 The (TER) is expressed as the mass of CO 2 emitted in kilograms per square metre of floor area per year The (TFEE) rate is expressed as the amount of energy consumed in units of kilowatt-hours per square metre of floor area per year

13 The Dwelling CO 2 Emission Rate (DER) and the Dwelling Fabric Energy Efficiency (DFEE) rate must be no worse than the TER and TFEE The final DER and DFEE must be based on the building as constructed

14 Before work starts, the builder must calculate the DER and DFEE rate of the dwelling as designed to demonstrate that they are not greater than the TER and TFEE rate, and notify the BCB When work is complete, the BCB must be notified of the TER/DER and the DFEE/TFEE rate and a list of any changes to the design

15 Regulation 25A Consideration of high-efficiency alternative systems An analysis that considers the technical, environmental and economic feasibility of using high-efficiency alternative systems in the dwelling design

16 Examples of high-efficiency alternative systems; Decentralised energy supply systems based on energy from renewables sources Cogeneration District heating based entirely or partially on energy from renewable sources Heat pumps

17 Criterion 2. Limits on design flexibility The individual fabric elements and the fixed building services of the building should achieve reasonable overall standards of energy efficiency Table 2 sets out the limiting fabric parameters In general, to achieve the TER and TFEE rate, a significantly better fabric standard than Table 2 is likely to be required

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19 Limiting system efficiencies Each fixed building service should be at least efficient as the minimum acceptable value for the particular type of service as set out in the Domestic Building Services Compliance Guide

20 Criterion 3. Limiting the effects of solar gain The dwelling should have appropriate passive control measures to limit the effect of heat gains on indoor temperature in summer, irrespective of whether the dwelling has mechanical cooling Solar gain can be beneficial in winter but can contribute to overheating in the summer Appendix P of SAP 2012 contains a procedure enabling designers to check whether solar gains are excessive

21 Criterion 4. Building performance Dwellings should be constructed and equipped so that performance is consistent with the calculated DER and DFEE rate Party walls and other thermal bypasses Thermal bridges Air permeability and pressure testing

22 Criterion 5. Provision for efficient operation The owner of the building should be provided with sufficient information about the building and it s services so that the building can be operated in such a manner as to use no more fuel and power than is reasonable

23 Model designs If the actual dwelling is constructed entirely to the specification in Section 5, it will meet the TER and better the TFEE rate and therefore pass Criterion 1 [Appendix R SAP 2012]

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25 Examples of notional specification; External walls 0.18 W/m 2 k with 100mm brick 100mm Xtratherm* full fill with 100mm Block inner leaf (0.11 Lambda) 80mm Kooltherm* K8 partial fill with 140mm Block inner leaf (0.11 Lambda) *Or similar insulants

26 Examples of notional specification; Concrete Ground Floor Slab 0.13 W/m 2 k For a P/A (Perimeter/Area) of 0.5 Celotex XR4130* 130mm *Or similar insulants

27 Examples of notional specification; Flat roof [warm deck] 0.13 W/m 2 k Celotex TD4000* 150mm Pitched between and under rafters 0.13W/m 2 k Celotex XR4100 between FR mm under *Or similar insulants

28 Examples of notional specification; Windows, rooflights and glazed doors (Whole window U value) 1.4 W/m 2 k Band A WER rating >=0

29 Examples of notional specification; Air tightness 5.0m 3 /hr/m 2

30 Summary of 2013 changes; New requirement 26A. Fabric energy efficiency target Notional dwelling introduced in Table 4 Consolidation of Dec 2012 amendments requiring the feasibility of high-efficiency alternative systems Guidance for insulation of circulations pipes in communal areas New Approved Document format with index

31 L1B. Existing dwellings L2B. Existing buildings other than dwellings Amendments to references, other legislation, standards, and minor changes to text and guidance NO SIGNIFICANT CHANGE

32 L2A. New buildings other than dwellings The main changes are; The notional building used to determine carbon dioxide targets is the same size and shape as the actual building, constructed to a concurrent specification delivering 9% carbon dioxide savings relative to Part L 2010

33 A wider set of notional buildings has now been defined for; (i) top-lit, (ii) side-lit (heated only) and (iii) side-lit (heated and cooled) buildings. The notional building air permeability has been further sub-divided by size.

34 If the actual building is constructed entirely to the notional building specifications it will meet the carbon dioxide targets and the limiting fabric and building services parameters. Developers are however free to vary the specification, provided the same overall level of carbon dioxide emissions is achieved or bettered.

35 Compliance with the energy efficiency requirements could be demonstrated by meeting the five separate criteria. Software (eg SBEM) should produce an output report to assist Building Control check that compliance has been achieved

36 Shell & core developments Where shell applications are subject to a future fit-out the developer should demonstrate at the design stage via a TER/BER submission how the building shell as offered could meet the energy efficient requirements. The specification provided to the BCB should identify which services have not been provided in the base build and the necessary infrastructure needed to deliver the assumed fit-out specification is provided as part of the base build.

37 Large extensions Where the proposed extension has a total floor area that is greater than 100m 2 AND is greater than 25% of the total useful floor area of the existing building, the work should be regarded as a new building and the guidance in Approved Document L2A followed. The requirements for consequential improvements, if appropriate, should also be met.

38 Extensions Fabric standards; Tables 2, 3 & 4 Openings, fittings & thermal elements Area weighted U-value method; no greater than that of an extension of the same size and shape that complies with the fabric standards Whole building calculation method; calculated CO 2 emissions from the proposed no greater than the notional

39 Part M Access to and use of buildings 2004 Edition Incorporating 2010 & 2013 amendments Guidance on Construction Products Directive References to The Equality Act 2010 Guidance on stairs, ramps, manifestation and glazed screens etc moved to Part K Access Strategies Door opening forces Changing places toilets Additional definitions

40 Part M Access to and use of buildings Access Strategies Replaces Access Statement It is important that applicants clearly communicate to the BCB how their chosen approach to meeting the accessibility needs of the likely end-users of a building and it s facilities demonstrates compliance with the requirements of Part M of The Building Regulations Note that ADM guidance is only one way of meeting the functional requirements The purpose of the Access Statement is not to simply highlight why access isn t being provided

41 Part M Access to and use of buildings Alternative Solutions Where these are proposed, they should be supported by appropriate research evidence or references to recognised British Standards to support the chosen approach Communication between applicants and BCBs should focus on areas where proposals diverge from the guidance in the Approved Document rather than providing an exhaustive explanation where features are in accordance with the guidance

42 Part M Access to and use of buildings Access Strategies Not always necessary if proposals follow guidance For small / simple works, a conversation between the applicant and BCB may be all that is required (record the correspondence) For large / complex works, a written document would be appropriate

43 Part M Access to and use of buildings The Equality Act 2010 An approval under The Building Regulations does not necessarily indicate compliance with duties under The Equalities Act Applicants need to consider these wider equality obligations when undertaking building work and whether provision in some circumstances should exceed that set out within the Approved Document

44 Part B Open plan dwellings Open plan duplex apartments and three storey dwellings with open plan ground floor What is acceptable as code compliant? Approved Document B Volume 1 Para 2.20 b. Open plan ground floor for loft conversions British Standard 9991: 2011 Clause 9.7. Open flats that contain a bedroom as an inner room

45 Part B Open plan dwellings Approved Document B Vol 1. Para 2.20 b Sprinkler protection to the open plan ground floor Fire resisting partition and door to separate the ground floor from the upper storeys Occupants of the loft room should be able to access an escape window on the 1 st floor Protected staircase AFD in staircase enclosure Cooking facilities should be separated from the open plan with fire resisting construction

46 Part B Open plan dwellings British Standard 9991: 2011 Clause 9.7 Open plan flats with a bedroom as an inner room Sprinklers throughout to British Standard 9251 Grade D, LD1 fire alarm system Open plan flat; Not to exceed 16m x 12m Should be single level only Minimum ceiling height 2.25m Enclose kitchen if flat over 10m x 8m Cooking appliances in flats smaller 10m x 8m should not be sited adjacent flat entrance

47 Part B Open plan dwellings Other guidance; NHBC/BRE collaborative research Open plan flat layouts assessing life safety in the event of a fire LABC RD 171 Automist for loft conversions Scottish Building Standards Clause Charnwood LABC Fire Engineering?

48 Part B Open plan dwellings LABC RD 171 Automist Must be installed in accordance with Automist Technical Guide Version 2.5 accredited installer AFD as Approved Document guidance Escape windows on 1 st floor FD30 door and partition on 1 st floor to separate gnd floor Max size of ground floor 32m 2 for each pump All points in the room should be within 5m of mist head Does not require cooking facilities to be separated

49 Part B Open plan dwellings Scottish Building Standards Clause Topmost storey more than 4.5m but not more than 7.5m Kitchen to be remote from the final exit door Enhanced AFD Grade D LD1 to BS5839: Pt 6: 2004 Suppression system using sprinklers in accordance with British Standard 9251 throughout the dwelling

50 Part B Open plan dwellings Charnwood LABC Open plan ground floor FD30s door at base of flight on GF to be on EMHD Upgrade doors within the staircase enclosure to FD30s LD1 Grade D AFD to BS5839: Pt 6: 2004 Upgrade all walls between rooms and staircase enclosure to 30 mins fire resistance Upgrade all floors to 30 mins fire resistance All rooms, inc bathroom, on 1 st floor to have escape windows

51 Open forum