We've spent the last few days digging a trench around the house perimeter to the top of the strip footings approx 750mm below ground level. The trench is then filled with 2 x 75mm Dow Roofmate XPS insulation, for nice cosy footings. We've decided not to continue the air-tight line behind the XPS because the timing doesn't work (EWI contract starting in a couple of weeks) and practically, difficult to do effectively three feet down! So there's a detail to be developed at dpc level to reduce the risk of air-leakage for the few inches exposed above ground.
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Russel and Anna Hayden
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