It's a common myth, but that's all it is - a myth! Building airtightness provides durability in assemblies, supports balanced ventilation for filtered fresh air supply and reduces heat loss through air infiltration. The building envelope should be airtight, continuously around the building, including the building slab. Phius certification airtightness limit (0.06 cfm/ft2 or approx. 0.6 ACH) is five times lower than what is required by building code (IECC 2018).
The device in action seen in the image is called a ‘blower door test’ which can pressurize or depressurize a building. The ‘resistance’ to the pressurization measures the amount of air leakage through the walls, roof and floor.
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