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Air Tightness Testing is a requirement of Part L1A & L2A of the Building Regulations for newly built Domestic and Commercial Buildings. Sustainable construction requires consideration of not only the to enrich our built environment and improve the quality of life for building occupants. In order to achieve compliance with the building regulations a dwelling must achieve a test result of 7m3/hr/m2 or below when tested at 50 Pascals pressure.

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All commercial properties over m2 will require an Air Test in order to comply with the Building Regulations/Standards properties under m2 often still. Approved Document L: Volume 2 of the Building Regulations requires that any building undergoing a commercial air pressure test, or commercial air tightness. Sustainable construction requires consideration of not only the to enrich our built environment and improve the quality of life for building occupants.

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Building tightness can also be presented as leakage area normalized to the building surface area. Testing standards include RESNET,. ASTM E and ASTM E Air Tightness Testing ; Greater than 40, but less than or equal to , At least 5% ; More than (a) When the first 5 tests achieve the design air. Air permeability testing is a mandatory requirement under Building Regulations Part L for all new houses and large extensions (25%+ of existing).