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Home Can a Garage Actually Pass a Blower Door Test?

Can a Garage Actually Pass a Blower Door Test?

Jake Bruton and Randy Williams — editor of Fine Homebuilding's Green Building Advisor — walk through a blower door test on a finished three-car garage at the Rocky Top Arrow project in Kansas City. The structure uses ZIP System sheathing on the walls and a continuous smart vapor control membrane on the ceiling, detailed as a full air barrier with taped seams throughout. The test registers 312 CFM at 50 pascals, translating to a 1.3 ACH50 — a strong result for a building this size, especially with temporary doors and exterior ductwork still in place. Thermal imaging and a smoke pen help locate minor leakage points and distinguish air infiltration from thermal bridging in the framing and concrete slab.

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