Air-Sealing Options: Better

Better air sealing (tightening to around 1.5 ACH50) requires a peel-and-stick or fluid-applied WRB, or a taped sheathing system, such as ZipWall. Here, the author has installed Corsella Dorkin’s Delta Vent SA .

With a perm rating of 50 it works in all climate zones. Sheathing must be primed before applying the WRB.

Windows need to be sealed with a low-expanding foam from the inside and taped on the outside.

Similarly, all through-wall penetrations must be foamed from the inside and taped outside.

Bottom wall plates must be caulked or taped inside, and sealed with flexible flashing outside.

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