BSRIA carried out the airtightness test in mid April, calculating the air permeability at 12.58 m3/(hr/m2). It appears that a disproportionate amount of air is leaking out from the 30 year old loft convertion. At the time of the test it was commented that without the attic, the 114 year old original construction would have an airtightness of around 8 m3/(hr/m2), which is lower than the current building regulations requirement of 10 for a new build.
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