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Part of the BRE Trust
Greener Homes for RedbridgeRichard Hartless
Scope of talk
• Project partners and description
• Adaptation of the Code for Sustainable Homes
• Refurbishment and Code specifications
• Physical monitoring
• Example results
• Summary of findings
Project partners and description• ETHG has funding from London Borough of Redbridge
to:– purchase and refurbish 20 dwellings to higher sustainability levels than
current ‘Decent Homes’ standard – allocate these to homeless people in the borough
• BRE provided technical support in specifying a highly sustainable refurbishment standard for the dwellings
Refurbishment standard
• Partnership workshop at BRE in Summer 2009 to:– agree basis for refurbishment standard è Adapted Code for
Sustainable Homes– Trial SAP and Code assessments on some of houses– Agree aspirational performance targets for energy efficiency, water etc.
as well as overall Code level– Procedure for physical monitoring pre and post-refurbishment– Opportunities for monitoring post-occupancy behaviour
Application of Code for Sustainable Homes
Refurbishment specification
Physical monitoring
• Before and after to demonstrate impact of measures:– Airtightness (with smoke pencil tests)– Infra red camera– Spot measurements of T, RH and ventilation– IAQ (Formaldehyde, Total VOCs and CO)– Water audit (tap and shower flows, WC types etc.)
• Individual reports prepared for each property:– Airtightness measurements used in SAP– Leakage and IR pictures guide refurbishment
• Funded by NHBC Foundation, BRE Trust and water companies
Decent Homes Plus refurbishment – 1950s Semi
• Significant air leakage:– Loft hatch– Holes in floor and ceiling– Decommissioned warm air c/h
system– Bathroom service pipes
9.7°C
18.2°C
10
12
14
16
18
SP01
• Uniform heat loss:– Cold air leaking up from floor
void– Loss at eaves– Cold air in from window
casements
Decent Homes Plus refurbishment – 1950s Semi
• Still air leakage:– Gaps around boards– Gaps around service
pipes
• Still heat loss:– Walls not improved– Cold air ingress– But: warm ceiling!
-5.1°C
7.4°C
-4
-2
0
2
4
6
SP01
• Improvements:– Loft insulation (0.16)– 100% CFLs
Highly sustainable refurbishment – 1930s End terrace
• Significant air leakage:– Crack in bay window– Window casements– Ceiling and floor
• Uniform heat loss:– Cold air leaking up from floor
void– Loss at eaves– Loss in front bay
8.3°C
18.5°C
10
12
14
16
18
SP01
Highly sustainable refurbishment – 1930s End terrace
• Reduced air leakage:– Most floor gaps filled– Still gaps around window
casements
• Reduced heat loss:– Still some wall heat loss– Some cold air ingress at
windows– Cold floor
• Improvements:– Loft + int. wall insulation– Improved heating– 100% CFL– Solar thermal and PV– Low-flow taps
1.9°C
13.9°C
2
4
6
8
10
12
SP01
Summary of findings
Decent Homes Plus refurbishment
Highly sustainable refurbishment
• Airtightness not improved, but heat loss reduced slightly
• Improved from Band F to Band D
• 23% reduction in CO2emissions, which is good but is below long-term government targets
• Airtightness improved and heat loss reduced considerably
• Improved from Band F to Band B
• 82% reduction in CO2emissions, in line with government targets
Cost of refurbishment
Cost of environmental works vs CO2 reduction
And finally……
• Project has won three awards:– Architect’s Journal Retrofit Award, in the large scale domestic
building category– Highly Commended Award in the Inside Housing Sustainable
Housing Awards– Retrofit project of the Year Award – Construction News 2011
Part of the BRE Trust
Thank you for listening