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<a href="/air-tightness-testing-abingdon-england">Air Tightness Testing Abingdon</a>
<a href="/air-tightness-testing-aldershot-england">Air Tightness Testing Aldershot</a>
<a href="/air-tightness-testing-alton-england">Air Tightness Testing Alton</a>
<a href="/air-tightness-testing-amersham-england">Air Tightness Testing Amersham</a>
<a href="/air-tightness-testing-andover-england">Air Tightness Testing Andover</a>
<a href="/air-tightness-testing-ascot-england">Air Tightness Testing Ascot</a>


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An air tightness test (also known as a blower door test) measures how much air leaks out of a building through gaps and cracks in the structure. A fan is temporarily fitted into an external doorway to pressurise the building, allowing engineers to measure the rate of air leakage. This helps determine the building’s energy efficiency and compliance with Building Regulations.
Yes. Air tightness testing is required under Part L of the Building Regulations for most new dwellings and commercial buildings in the UK. The test ensures the building meets the required energy efficiency standards before it can be signed off by Building Control.
Air tightness testing should be carried out towards the end of construction, once the building envelope is complete but before final finishes are installed. This allows any air leakage issues to be identified and fixed if necessary.
If a building fails the test, the tester will usually identify the main areas where air leakage is occurring. These gaps can then be sealed before the building is retested to achieve compliance with the required air permeability target.
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