prof. david strong, chief executive, inbuilt ltd . good homes alliance christmas event,
DESCRIPTION
SAP, Building Regulations and the Code. Prof. David Strong, Chief Executive, Inbuilt Ltd . Good Homes Alliance Christmas Event, The Princes Foundation 9 th December 2009. Regulatory and other key drivers in the UK. Policy framework. - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Prof. David Strong, Chief Executive, Inbuilt Ltd . Good Homes Alliance Christmas Event,](https://reader035.vdocument.in/reader035/viewer/2022062305/5681666d550346895dda081c/html5/thumbnails/1.jpg)
Prof. David Strong, Chief Executive, Inbuilt Ltd. Good Homes Alliance Christmas Event, The Princes Foundation9th December 2009
SAP, Building Regulations and the Code
![Page 2: Prof. David Strong, Chief Executive, Inbuilt Ltd . Good Homes Alliance Christmas Event,](https://reader035.vdocument.in/reader035/viewer/2022062305/5681666d550346895dda081c/html5/thumbnails/2.jpg)
Regulatory and other key drivers in the UK
![Page 3: Prof. David Strong, Chief Executive, Inbuilt Ltd . Good Homes Alliance Christmas Event,](https://reader035.vdocument.in/reader035/viewer/2022062305/5681666d550346895dda081c/html5/thumbnails/3.jpg)
Policy framework
• Climate Change Act: legal obligation on Government
• CLG consultation on Zero Carbon Definition• Minimum energy efficiency standard• Heat &Energy Saving Strategy • EC initiatives: Energy Using Products
Directive, EPBD Mk2• to name a few ........
![Page 4: Prof. David Strong, Chief Executive, Inbuilt Ltd . Good Homes Alliance Christmas Event,](https://reader035.vdocument.in/reader035/viewer/2022062305/5681666d550346895dda081c/html5/thumbnails/4.jpg)
Policy framework
Timetable for new homes:• 25% improvement in 2010 CSH energy level 3• 44% improvement in 2013 CSH energy level 4• Zero carbon from 2016 CSH energy level 6
![Page 5: Prof. David Strong, Chief Executive, Inbuilt Ltd . Good Homes Alliance Christmas Event,](https://reader035.vdocument.in/reader035/viewer/2022062305/5681666d550346895dda081c/html5/thumbnails/5.jpg)
Key changes to SAP
• Fully monthly calculation
• Updated weather file
• Revised emissions factors
![Page 6: Prof. David Strong, Chief Executive, Inbuilt Ltd . Good Homes Alliance Christmas Event,](https://reader035.vdocument.in/reader035/viewer/2022062305/5681666d550346895dda081c/html5/thumbnails/6.jpg)
Biomass (pellets)
Gas(kg/
kWh)LPG Heating
OilHouse Coal
Electricity(kg/kWh)
SAP 2005 0.13 1.00
(0.194) 1.21 1.37 1.50 2.18 (0.422/0.568)
SAP 2009 0.18 1.00
(0.206) 1.22 1.38 1.85 2.87(0.591)
• CO2 equivalent• Upstream emissions
• Liquid biofuels included
![Page 7: Prof. David Strong, Chief Executive, Inbuilt Ltd . Good Homes Alliance Christmas Event,](https://reader035.vdocument.in/reader035/viewer/2022062305/5681666d550346895dda081c/html5/thumbnails/7.jpg)
• Boiler systems – modification to SEDBUK– Different summer and winter
efficiencies
• Thermal mass and cooling (regionality)
Key changes to SAP
![Page 8: Prof. David Strong, Chief Executive, Inbuilt Ltd . Good Homes Alliance Christmas Event,](https://reader035.vdocument.in/reader035/viewer/2022062305/5681666d550346895dda081c/html5/thumbnails/8.jpg)
Key changes to SAP
• Hot water use – same volume but cooler
• Auxiliary energy use– energy use– energy gains
• Occupancy – more crowded than we thought!
![Page 9: Prof. David Strong, Chief Executive, Inbuilt Ltd . Good Homes Alliance Christmas Event,](https://reader035.vdocument.in/reader035/viewer/2022062305/5681666d550346895dda081c/html5/thumbnails/9.jpg)
Key changes to L1A
Same general 5 step approach – familiar and welcome
• DER ≤ TER • Limits on design flexibility• Limiting the effects of solar gains in summer• Quality of construction & commissioning• Providing information / O&M instructions
![Page 10: Prof. David Strong, Chief Executive, Inbuilt Ltd . Good Homes Alliance Christmas Event,](https://reader035.vdocument.in/reader035/viewer/2022062305/5681666d550346895dda081c/html5/thumbnails/10.jpg)
1. DER ≤ TER
X 0.75 = Target 2010
Target2006
Adjusted for - New CO2 factors
Party wall bypass
![Page 11: Prof. David Strong, Chief Executive, Inbuilt Ltd . Good Homes Alliance Christmas Event,](https://reader035.vdocument.in/reader035/viewer/2022062305/5681666d550346895dda081c/html5/thumbnails/11.jpg)
2.Limits on design flexibility
• Largely unchanged
• Updated building series compliance guide
• Methods to stop easy compliance with renewables
![Page 12: Prof. David Strong, Chief Executive, Inbuilt Ltd . Good Homes Alliance Christmas Event,](https://reader035.vdocument.in/reader035/viewer/2022062305/5681666d550346895dda081c/html5/thumbnails/12.jpg)
3. Limiting impact of solar gain in summer
• SAP - 3 separate months assessed• Cooling demand calculated regionally• Test applied even if cooling installed• Policing – need much greater attention
![Page 13: Prof. David Strong, Chief Executive, Inbuilt Ltd . Good Homes Alliance Christmas Event,](https://reader035.vdocument.in/reader035/viewer/2022062305/5681666d550346895dda081c/html5/thumbnails/13.jpg)
3. Limiting impact of solar gain in summer
• Shading
• Reduce internal gains
• Add mass where possible
• Night ventilation
Education for designers (and planners?)
![Page 14: Prof. David Strong, Chief Executive, Inbuilt Ltd . Good Homes Alliance Christmas Event,](https://reader035.vdocument.in/reader035/viewer/2022062305/5681666d550346895dda081c/html5/thumbnails/14.jpg)
4. Construction & commissioning
Airtightness• Doubled sampling rate• Changes to testing regime
Thermal bridging• ACD scheme in the making?
Commissioning plan required
![Page 15: Prof. David Strong, Chief Executive, Inbuilt Ltd . Good Homes Alliance Christmas Event,](https://reader035.vdocument.in/reader035/viewer/2022062305/5681666d550346895dda081c/html5/thumbnails/15.jpg)
Improving compliance and confidence
• Energy Assessor checks• BCB provided with a specification – not just a
sheet of U-values• Margin added to non-pressure tested units• Margin added to ‘non-accredited’ details
![Page 16: Prof. David Strong, Chief Executive, Inbuilt Ltd . Good Homes Alliance Christmas Event,](https://reader035.vdocument.in/reader035/viewer/2022062305/5681666d550346895dda081c/html5/thumbnails/16.jpg)
Part FADF 2006 only designed for 3 m3/h/m2 @50PaHowever AECOM study showed:• 52% of door undercuts less than 10mm• 72% of trickle vents areas less than ADF• 89% of kitchen extracts less than ADF and 79%
of batroom extracts less than ADF• Overall 55% of dwellings have ventilation rates
less than ADF. • Can local extract be trusted?
![Page 17: Prof. David Strong, Chief Executive, Inbuilt Ltd . Good Homes Alliance Christmas Event,](https://reader035.vdocument.in/reader035/viewer/2022062305/5681666d550346895dda081c/html5/thumbnails/17.jpg)
Part F• In eight out of nine dwellings, the MEV
systems failed to achieve their design flow rates, in some cases by as much as 63%
• Can mechanical ventilation be trusted?
![Page 18: Prof. David Strong, Chief Executive, Inbuilt Ltd . Good Homes Alliance Christmas Event,](https://reader035.vdocument.in/reader035/viewer/2022062305/5681666d550346895dda081c/html5/thumbnails/18.jpg)
How airtight are our homes?
Part L study• ~30% of new dwellings tested < 5 m3/h/m2 @50 Pa• ~3-5% of new dwellings tested < 3 m3/h/m2 @50 Pa
NHBC data• ~70% < 7 m3/h/m2 @50 Pa• ~40% < 5 m3/h/m2 @50 Pa
• Need robust approach to ventilating new homes
![Page 19: Prof. David Strong, Chief Executive, Inbuilt Ltd . Good Homes Alliance Christmas Event,](https://reader035.vdocument.in/reader035/viewer/2022062305/5681666d550346895dda081c/html5/thumbnails/19.jpg)
ADF new requirements
For dwellings designed to an air permeability of 5 m3/h/m2 @ 50 Pa or tighter:
• Extract vent (local, PSV and MEV) - bigger trickle vents
• PSV – bigger duct sizes• MVHR
– Increased air flow rate requirements
![Page 20: Prof. David Strong, Chief Executive, Inbuilt Ltd . Good Homes Alliance Christmas Event,](https://reader035.vdocument.in/reader035/viewer/2022062305/5681666d550346895dda081c/html5/thumbnails/20.jpg)
ADF new requirements
For new dwellings only, new requirements for:• Air flow rates of mechanical systems
(including intermittent extract fans) should be measured on-site.
• Owner to be given information to operate and maintain natural and mechanical systems properly
• Check list to be given to building control body as evidence that all the above have been done
![Page 21: Prof. David Strong, Chief Executive, Inbuilt Ltd . Good Homes Alliance Christmas Event,](https://reader035.vdocument.in/reader035/viewer/2022062305/5681666d550346895dda081c/html5/thumbnails/21.jpg)
Code for Sustainable Homes
• Faster delivery of certification• Bringing forward some of the evidence• Greater stability – too many versions• Lifetime homes• Conflicts with Passivhaus and innovative housing
– interpretation of requirements varies
![Page 22: Prof. David Strong, Chief Executive, Inbuilt Ltd . Good Homes Alliance Christmas Event,](https://reader035.vdocument.in/reader035/viewer/2022062305/5681666d550346895dda081c/html5/thumbnails/22.jpg)
Summary• Beware!
- The Law of Diminishing Returns- The Law of Unintended Consequences- Murphy’s Law
![Page 23: Prof. David Strong, Chief Executive, Inbuilt Ltd . Good Homes Alliance Christmas Event,](https://reader035.vdocument.in/reader035/viewer/2022062305/5681666d550346895dda081c/html5/thumbnails/23.jpg)
Prof. David Strong, Chief Executive, Inbuilt LtdE-mail: [email protected]
Tel: 01923 277061
www.inbuilt.co.uk