Code For Sustainable Homes Technical Update

Transcription

1 Code For Sustainable Homes 2010 Technical Update

2 Overview General Ene Mat 2 3 Sur 1 2 Was Hea 3 4

3 General All evidence requirements updated as per TGN002 PCS exemptions 60% rule for centralised infrastructure Now variable where statutory requirements exist Community heating systems Infrastructure to allow connection must be provided All dwellings Regardless of percentage completed

4 Energy and CO 2 Emissions Now 31 Credits 36.4% Weighting 1.17 % points per credit

5 Energy Changes to issue names and credits awarded: Ene 1 Dwelling Emission Rate 10 credits (was15) Ene 2 Fabric Energy Efficiency 9 credits (was 2) Ene 3 Energy Display Devices 2 credits

6 Ene 1 Dwelling Emission Rate 10 Credits % improvement of DER over TER Credits Mandatory Levels 8% 1 16% 2 25% 3 Level 4 36% 4 47% 5 59% 6 72% 7 85% 8 100% 9 Level 5 NB the tool will now award fractions of credits* So a 41.5% improvement will earn 4.5 credits *using linear interpolation truncated to 1 d.p. Zero Net CO 2 Emissions 10 Level 6

7 Changing numbers Old TER 25% Code level 3 New TER 44% Code level 4 25% 19% 100% Code level 5 100%

8 Ene 1 Section 16 allowances Issues covered in Section 16 of SAP ARE NOT included in the DER in SAP Must add these separately in the calculator tool Key question in the tool are Section 16 allowances sought? Energy generation beyond the curtilage of the building (ie communal) ZC5 - CO 2 reduction from additional allowable energy generation Residual CO 2 emissions offset from Biomass CHP ZC7 - Residual CO 2 emissions offset from Biomass CHP Reduces the DER further still SECTION 16

9 Dwellings in the same envelope Energy Group

10 Different servicing strategies Top floor flats serviced by the PV 1 Energy Group

11 Dwellings in different blocks/envelopes 2 Energy Groups

12 Dwellings in a terrace (Ene 1 only) 1 Energy Group Same building envelope can be grouped

13 Ene 2 Fabric Energy Efficiency (FEE) 9 Credits Focuses on the inherent properties of dwelling kwh/m 2 /year From SAP FEE Worksheet Box 109 Grouping/Averaging possible in flats (only!) Independent from the groups for Ene1

14 Ene 2 Fabric Energy Efficiency Dwelling Type Apartment Blocks, Mid-Terrace End Terrace, Semi- Detached & Detached Fabric Energy Efficiency kwh/m 2 /year Credits Mandatory Levels Levels 5 &

15 Ene 2 Stepped/staggered terraces Stepped terraces Allowance made for greater exposed area Formula See Special Cases in manual

16 Ene 2 Fabric Energy Efficiency Dwelling Type End Terrace, Apartment Semi- Blocks, Mid- Detached & Terrace Detached Fabric Energy Efficiency kwh/m 2 /year Credits Mandatory Levels Levels 5 & All calculations done automatically in the Ene 1/2 tool These scales represent the 2 extremes The scale for stepped will lie in between

17 Ene 1 / Ene 2 Prerequisites Section 16 allowances Only creditable providing good fabric energy efficiency ie must get 5 credits in Ene 2 Fabric Energy Efficiency Code level 6 Must get 7 credits in Ene 2 Fabric Energy Efficiency

18 Quick reminder of key points Section 16 allowances Refer to communal energy generation Boxes ZC5 and ZC7 in SAP Resultant DER is even lower Pre requisites Section 16 allowances Only if 5 FEE Ene 2 credits awarded Code level 6 Only if 7 FEE Ene 2 credits awarded Stepped terraces Recognised and accounted for in Ene 2 Grouping (energy averaging) Multiple dwellings in same building envelope SECTION 16

19 Ene 3 Energy Display Devices 2 Credits Consumption data Correctly specified energy device 1 credit: Current electricity or primary heating fuel 2 credits: Current electricity and primary heating fuel If electricity is primary heating fuel? Correctly specified energy device Self charging sensors fixed to incoming mains supply Displaying: Time, current mains consumption/emissions/tariff/cost, account balance info, visual presentation, historical consumption

20 Ene 4 - Drying Space Internal drying space must have ventilation complying with Building Regulations AD F In addition Extract rate 30l/s minimum

21 Ene 7 - Zero/Low Carbon Technologies LZC technology specified must be: Direct supply (dedicated) Meet additional requirements defined in Directive 2009/28/EC Certified under Micro-generation Certification Scheme (MCS) Under 50kWe or 300kWth Certified under CHPQA standard Under 50kWe for further info Accounted for in SAP Energy calculator tool needed Proportion communal supply by net floor area Green Tariffs do not comply KgCO 2 /m 2 /year Reduction in CO 2 Emissions Credits 10% 1 15% 2

22 Ene 7 - Methodology Standard case SAP Actual SAP (from Ene 1) with some details replaced See table CAT 1.2 Mains gas SEDBUK 88% boiler Stored hot water etc Actual case Standard case with some details replaced put back the actual values But only if they correspond to eligible technologies I.E. Defined in EU directive Standard SAP Has to be a LZC not just a more efficient gas boiler No recognition in Ene 7 for a boiler of SEDBUK rating of > 88% Actual SAP

23 Ene 7 - Zero/Low Carbon Technologies See Table Cat 1.2 in Calculation Procedures Only the actual values for eligible technologies can be put back Some or all could be put back Care needed Could mean 3 SAP sheets! SAP of the actual building (used in Ene 1 and 2) SAP of standard case Actual SAP = standard case with some actual values put back Simple adjustments for a SAP assessor

24 Ene 8 - Cycle Storage Requirements for secure cycle storage met where compliance with clause 35 of Secured by Design New Homes 2010 is met Just another way of demonstrating compliance NB Fully enclosed structure not required

25 Materials

26 Mat 2/3 Rigour of source Tier system Tier level Issue assessed Points available per element Evidence/measure assessed Examples of compliant schemes 1 Legality and responsible sourcing 2a 2b Legality and responsible sourcing Legality and responsible sourcing 3 Legality and responsible sourcing 4 Legality and responsible sourcing 3 Certification scheme FSC, CSA, SFI with CoC, PEFC, Reused Materials, and Schemes compliant with BES6001:2008 (or similar) Excellent and Very Good Performance Ratings (Note: the EMS required to achieve these ratings must be independently certified). 2.5 Certification scheme Schemes compliant with BES6001:2008 (or similar) Good Performance Rating (Note: the EMS required to achieve this rating must be independently certified). 2 Certification scheme Schemes compliant with BES6001:2008 (or similar) Pass Performance Rating (Note: the EMS required to achieve this rating must be independently certified). 1.5 Certification scheme/ems Timber: MTCC, Verified, SGS, TFT Other materials: Certified EMS for the Key Process and Supply Chain Recycled Materials with Certified EMS for the Key Process. 1 Certification scheme/ems Certified EMS for the key process stage.

27 Surface Water Run-Off

28 Sur 1 Mandatory Requirement There are still two key principles which need to be achieved to meet the mandatory requirements of Sur 1: Peak rate of runoff Ensuring the peak rate of runoff is no greater post development than it was pre development Volume of runoff Ensure that the post development volume of runoff is no greater than it was pre development. The approach to dealing with additional volumes of runoff should be in accordance with hierarchy outlined in the Technical Guide

29 Criteria Overview Use SuDS management train: 1 Peak rate of run off No greater than pre developed site 2A Volume of run off Additional volume entirely reduced Infiltration or other SuDS techniques Must do this first, only move to 2B if 2A cannot be satisfied 2B Volume of run off Reduce run off rate to limiting discharge Must do 2A first where possible Underground attenuation tanks possible solution here (not in 2A)

30 Volume of runoff Additional volumes of runoff should be prevented from leaving the site as far as possible using the relevant SuDS techniques If not all of the additional volume of runoff can be prevented from leaving the site, a full evaluation must be provided to confirm that all appropriate SuDS have been considered In this instance, any residual additional volume of runoff that could not be prevented from leaving the site, can be attenuated stored and then discharged from the site at the Limiting Discharge.

31 Key changes to note in the mandatory requirements Ensure an Appropriately Qualified Professional (in line with the new definition) is employed to carry out the relevant calculations Climate change allowance should only be added to post development calculations Calculation methodologies for peak rates of runoff for Greenfield and Brownfield sites have been amended Amendments to the volume requirements Special cases introduced in TGN001 are now within the Technical Guide Additional requirement to ensure that that flooding of a property would not occur in the event of local drainage system failure

32 Two Optional Credits Using SUDS to improve or protect the quality of receiving watercourses. Two methods: Prevent the first 5 mm of rainfall from discharging into the watercourse and Ensure runoff from all hard surfaces will receive an appropriate level of treatment (in accordance with the SuDS manual)

33 Waste Now 8 Credits 6.4 % Weighting 0.80 % points per credit

34 Was 1 - Storage of non-recyclable waste & recyclable household waste Mandatory Requirement A suitable area of sufficient size to house the greatest volume of EITHER All containers provided by the Local Authority (Refuse and Recycling) OR The minimum capacity as calculated using BS 5906:2005 Storage spaces must provide inclusive access and usability (checklist IDP*) Access route, surfaces, widths, doors, gates, stairs, communal rules, switches and sockets *Inclusive Design Partnership

35 Was 2 - Construction Waste 3 Credits Minimising (1 credit) Site Waste Management Plan (SWMP) Benchmarks, commitments, procedures, monitoring, measuring, reporting etc Diverting waste from landfill (2 nd and 3 rd credits) SWMP has procedures and commitments to sort and divert waste from landfill by either 50% 2 credits 85% 3 credits Checklists available

36 Was 3 - Composting Facilities Composting facilities Inclusive access (Checklist IDP) also applies

37 Health and Wellbeing

38 Hea 3 - Private Space Outdoor space: Minimum size allow all occupants to sit outside Provide inclusive access and usability (Checklist IDP) Exemption of requirement 6A for roof terraces where step up is unavoidable Accessible only to occupants of designated dwellings

39 Hea 4 - Lifetime Homes Special case introduced Plots with gradient exceeding gradient 1:15 Help on calculating this in the Guidance Exempt from Lifetime Homes criteria 2 and/or 3 3 credits can be awarded in this case Level 6 Mandatory level also met But will not qualify as a Lifetime Home!