The UK Building Regulations Part L now require minimum standards of air tightness to be achieved in newly constructed buildings and dwellings.
All new buildings and dwellings need to demonstrate a minimum level of air permeability (10m³/(h.m²)) – in the majority of cases this is done through an on-site pre-completion test and the presentation of a PASS test certificate – following tests carried out by an appropriately certified air test engineer.
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