When it comes to designing an airtight building, are you clued up or do you just hope for the best? If the latter sounds more like you, don't fear; the second of our four-part series is Simon Lloyd's cut out and keep guide to airtight design. When a building fails its airtightness test it is not just a simple matter of finding out where the contractor has slipped up. The question that also needs asking is, was the building actually designed to be airtight?
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