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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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

6

8

10

12

SP01

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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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.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

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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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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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.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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Next steps….

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www.energysavingtrust.org.uk/housing