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Musings of an Energy Nerd
Air Leakage Through Spray Polyurethane Foam

How thick does a layer of spray foam insulation has to be to qualify as an air barrier?
Musings of an Energy Nerd
Is OSB Airtight?

Builders and researchers in North America and Europe report that air can leak right through oriented strand board

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Air Leakage Through Spray Polyurethane Foam