First UK EnerPHit Retrofit Announced

20th August, 2012

Low carbon engineering consultancy Encraft has used timber extensively in an existing house retrofitted to meet the Passivhaus energy efficiency standard. The 1940s Wellesbourne semi is the first in the UK to be accredited to the Passivhaus retrofit standard (EnerPHit) by a UK-based auditor. The £100,000 project has reduced the fuel bills of the house by around 85% to just £200 a year.

The refurbishment included installation of mechanical ventilation heat recovery (MVHR) and improved insulation. The timber elements included a new attic truss roof, various structures in the roof space for mounting the gas boiler, solar photovoltaic inverter and MVHR unit, and bearers at the base of triple-glased windows so they could be hung off the walls in the insulation layer, to avoid thermal bridging.

New doors, window cills and skirting were also in wood. Energy monitoring of the house will be undertaken by Coventry University and Encraft is working on other Passivhaus projects with housing associations in the city.

Encraft Passivhaus consultant Helen Brown explained: “This project marks a turning point in the UK Passivhaus and EnerPHit sector. Not only is it the second EnerPHit project, and the first to be certified by a UK-based certifier, it has also achieved higher air tightness results than those required by Passivhaus standards, thus dramatically reducing energy bills for tenants. 58 Elliott Drive was the first Wimpey no-fine house in the world to be retrofitted to this standard. It shows what can be achieved with this kind of building and how it can be applied to the rest of the UK housing stock. This gives us hope that in these times of austerity and fuel poverty, we can really make a difference to thousands of families on a limited income, in a cost-effective way and with respect for the environment.”

For more information visit: www.passivhaustrust /news

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