A semi-detached house in Warwickshire has become the second building in the UK to secure the Passivhaus certification for a refurbishment known as the EnerPhit standard.The design and specification of the flooring was key in achieving the standard. A combination of insulation and the installation of an airtight barrier helped cut the U-value of the flooring from around 2.5 to 0.1W/(m2K). Overall the refurbished home achieved an air leakage at +/- 50 Pa of just 0.57/hr, well within the 1/hr required under the EnerPhit standard.
The project in Wellesbourne was part of a pilot project looking at how the energy performance of a pair of 1955 Wimpey no-fines semi-detached homes could be improved through creating highly insulated, airtight buildings.Number 58 Elliott Drive was refurbished to Passivhaus standards and had new insulation in the floor, walls and floor as well as a MVHR system, solar PV tiles, gas central heating and low energy appliances. The affordable green retrofit project next door just had external insulation installed and air tightness was improved without the use of membranes or specialist tape.
Heritage Doors & Floors Brings its Range of Hardwood Products to UK.The foundations of the EnerPhit property were insulated both inside and out, with 200mm of insulation to reduce thermal bridging and thus heat loss through them.This meant that the original concrete floor was dug up and 200mm of insulation installed under a new slab. It would have been cheaper to keep the original floor in place but the floor build-up would have resulted in an unacceptable reduction in ceiling height. No insulation is installed in the floor of the affordable retrofit.
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