Jordan Smith tackles a tricky air-sealing challenge: keeping garage fumes out of a loft space built above it. He explains why detaching garages from living spaces is ideal, but walks through the alternative when a client wants a conditioned garage connected to an in-law suite overhead. Smith details how Advantech subfloor doubles as an air barrier, how zip tape ties the floor deck to rim joists and exterior sheathing, and why keeping air-sealing details on the exterior side of the wall protects the barrier from future damage. He emphasizes tracing a continuous, unbroken line around every framing member to avoid gaps that compromise performance and invite moisture problems.

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