Why do I need an airtightness test?

Under TGD L 2019 all new domestic and commercial buildings need an air tightness test when the building is complete. The air tightness test result must be less than 5 m3/hour/m2 @ 50 Pascals to satisfy the building regulations. You might also get an air tightness test when doing a deep retrofit of a building to identify the areas that are most drafty. It can be especially useful when coupled with a smoke test or thermal imaging survey to identify where you are losing heat and if windows are badly sealed

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