Air Sealing Penetrations

Air Sealing Penetrations

Plumbing penetrations to the exterior, such as drainpipes leading into an unsealed crawlspace or through slabs, must be air-sealed per the 2021 IECC. (Photo by Matt Risinger.)

Air Sealing Penetrations

Under the 2021 IECC, all electrical penetrations to the exterior must also be sealed. Note that an air-seal at fireblocking height doubles as a fire stop and requires a fire-rated sealant. (Photo by Roe Osborn.)

Air Sealing Penetrations

In this garage wall, foam is used to seal up the boxes facing the garage; note the flanged OS-4 box (center, in photo) for the kitchen-facing wall. (Photo by Matt Risinger.)

Air Sealing Penetrations

Here the air barrier is created with Zip System at the exterior sheathing. This is the easiest place to seal penetrations through this building envelope. (Photo by Jake Bruton.)

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