Showcasing refurbishment: Sheffield Eco-terrace
Mat ColmerHead of Housing & Supply Chain
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Presentation Title
.org.uk/housing
Home energy use is
responsible for over a
quarter of UK carbon dioxide
(CO2) emissions which
contribute to climate change
Ultimately, by 2050 all
dwellings will need to
achieve an energy
performance rating in the
range of a high EPC band B
to band A if we are to reach
our target of a 80% cut in
CO2 emissions across the
entire housing stock
The headline challenge
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.org.uk/housing
Background to the refurbishment competition
Twice the terrace
The ultimate large family home and a viable solution to
overcrowding
Shillam + Smith Architecture & Urbanism
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.org.uk/housing
Background to the refurbishment competition
21stCterraceOpen plan living and working for a young urban
couple
Letts Wheeler Architecture & Design Ltd.
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.org.uk/housing
83 Robey Street, Sheffield
Ash Sakula Architects
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Existing property and its energy performance
~10%of all existing
dwellings are solid walled mid terraced
properties
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Thermal element U-value (W/m2K)
Roof void above room in roof space 2.30
Roof void above first floor rooms/loft eaves 1.07
Solid brickwork external walls 2.10
Stud walls to room in the roof space 1.37
Ground floor 0.62
Openings U-value (W/m2K)
Solid timber doors 3.00
Existing double glazing 2.70
Velux rooflight 3.40
Other features
Thermal bridging analysis (y-value) 0.028 W/m2K
Ventilation Natural (no extract fans)
Airtightness 21.7 m3/m2.hr@50Pa
Heating Combi boiler 70% efficient
Hot water From boiler
Low energy lighting None
Orientation Front elevation - south west
39SAP2005
EEPC band
7.2 t/yr
Total CO2 emissions
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Pre-refurbishment figures
Energy source Total energy demand (kWh/yr) Annual running costs
GasMain heating and hot water 25,500
£935Cooking 1,250
Electric
Secondary heating 1,550
£540Lights, pumps & fans 920
Appliances 2,250
CO
2 e
mis
sion
s (k
g/yr
)
0
2,500
5,000
7,500
Central heating
4,801
Domestic hotwater 797
Lights, pumps& fans
390
Cooking &appliances
1,190
Total
7,178
CO2 emissions as existing
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Airtightness testing and infrared thermography
5.8°C
13.8°C
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8
10
12
SP01
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.org.uk/housing
Thermal bridging details
37 non repeating thermal bridge junctions
• extensive modelling of 112 existing and improved junction variants
Existing dwellings do not have significant thermal bridging
• y = 0.028 W/m2K pre-refurbishment
Detailing at Eco-terrace has maintained a good level of thermal bridging
• y = 0.043 W/m2K post -refurbishment
• provided an existing dwelling with the equivalent of the Enhanced Construction Details (y = 0.040 W/m2K)
Investigation has significant learning for industry, and may bring in more locations for inclusion in SAP revisions
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Presentation Title
.org.uk/housing
Completion – October 2009
24Month project
duration
7Month build
time
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92SAP2005
AEPC band
<1.7 t/yr
Total CO2 emissions
Thermal element U-value (W/m2K)
Roof 0.20
Solid brickwork external walls (internal insulation) 0.28
Solid brickwork external walls (external insulation) 0.39
Walls to room in the roof space 0.14
Ground floor 0.18
Openings U-value (W/m2K)
Solid insulated timber doors 1.79
BFRC A rated double glazing 1.36
Velux rooflight (as existing) 3.40
Other features
Thermal bridging analysis (y-value) 0.043 W/m2K
Ventilation MVHR (SAP Appendix Q accredited)
Airtightness 6.7 m3/m2.hr@50Pa
Heating Regular boiler 91.2% efficient
Low energy lighting 100%
Solar thermal panels 4m2 flat plate
Photovoltaic panels Generating capacity 0.86 kWp
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.org.uk/housing
Post-refurbishment figures
Energy source Total energy demand (kWh/yr) Annual running costs
GasMain heating and hot water 3,870
£265Cooking 1,250
Electric
Lights, pumps & fans 770
£218Appliances 1,800
Offset from PV -670
CO
2 e
mis
sion
s (k
g/yr
)
-500
0
1,000
2,000
Centralheating
450
Domestichot water
301
Lights, pumps& fans
324
Cooking &appliances
1,001
Total
1,697
CO2 emissions as refurbished
Offsetfrom PV
-378
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Presentation Title
.org.uk/housing
Now it is an eco-terrace
76%reduction in CO2
emissions
This represents a
The overall cost of
the Eco-terrace is in
the region of
£150,000
Material costs for
energy efficiency
measures
£45,000
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Presentation Title
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Tool-box talk
Training links each job and contractor to overall energy performance of property• all trades can impact a refurbishment,
from the first one in to the last• every job can impact on the performance
achieved by the previous trades• high levels of energy efficiency requires
the highest standards of workmanship
Contractor noted that the approach to working did change favourably in the other dwellings which formed part of the overall refurbishment scheme in Page Hall
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Presentation Title
.org.uk/housing
Lessons learnt
Energy Saving Trust:
• Flexibility in terms of timeline
• One size does not fit all
• Performance assessment must include both regulated and non-regulated emissions
• Engagement and training for all on-site trades
– where any CO2 savings are missed the burden is passed to other
dwellings
• Clear lines of communication with project teams• Involvement of the local community and local representatives
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Presentation Title
.org.uk/housing
Next steps….
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www.energysavingtrust.org.uk/housing