Passivhaus are to produce a new standard for refurbishment projects. The ‘Passivhaus’ standard requires high levels of thermal insulation and airtightness. The new standard is to be called EnerPHit and there are two fundamental differences between the standards for new build and refurbishment. It is unlikely that the standard will be applied to conservation work. The standard varied from the standard for new build by relaxing the requirements for energy use for space heating and airtightness.
The energy requirement for space heating must not be greater than 25kWh/m2 per year as compared with 15kWh/m2 per year for new build. The airtightness requirement is a maximum of one air change per hour as compared with new build which requires a maximum rate of 0.6 air changes per hour.
The new standard will be launched next year and it will be interesting to see how the standard is rolled out. As always supervision and robust detailing will be the key but the initial survey will need to include a comprehensive analysis of the existing fabric.
Monday, 27 September 2010
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