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To prevent air from leaking into penetrations along the planes of those varied layers, I sealed edges with Prosoco R-Guard Joint & Seam Filler
We used a Sawzall to expose the holes in the subfloor, then sealed the pipe or wiring with tape.
“Puddle sealing” involves using a 4-inch hole saw to make a hole in the bottom plate where multiple wires will run through the subfloor, and pouring a fluid sealant around them.
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