The second air-test was carried out last week with the help of Enhabit. The good news is that the results were significantly better than the first attempt: the not so good news is they were not quite good enough. We are still aiming for EnerPHit, (less than or equal to 1.0 air change/hr at 50Pa).
If the loft volume is taken into account we managed an average 1.45 air change/hr at 50Pa, and if the loft is excluded it drops to 1.70. There is ongoing discussion with the certifier about which is correct, but since the loft is within the air-tight line this would seem the correct approach to us. Clearly the bigger the volume the better the result. Many areas of air-leakage were identified during the test, but the main culprit seems to be where the new build extension meets the existing house. Lesson learnt: don't rely on a single line of defence. Tape at every opportunity.
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Russel and Anna Hayden
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