Is OSB an air barrier?

Most builders assume — and GBA has long reported — that oriented strand board (OSB) is a good air barrier. If a builder uses a high quality tape like Siga Wigluv, Zip System tape, or 3M All Weather flashing tape to seal sheathing seams, OSB wall and roof sheathing can act as a building’s primary air barrier.Click to see full answer. Also to know is, is OSB a vapor barrier?Any material that allows less than 60NG (nanograms) of moisture to pass through under specific conditions, is considered a type 9 residential vapour barrier by the National Building Code. Rated at 40NG, 3/4 inch OSB sheathing can be one of the better vapour barriers for home construction in most of Canada. can you seal OSB? AFM Safe Seal Plywood & OSB Sealer. Safecoat Safe Seal is a multi-purpose, waterborne, clear low gloss primer/sealer. AFM Safe Seal adds water and moisture protection to a variety of surfaces and is virtually odorless on application and odorless once cured. Furthermore, is polyethylene an air barrier? Although 6-mil polyethylene is an excellent vapor barrier it is often a very poor air barrier. I will agree that it is possible to install 6-mil polyethylene as an air barrier. The key point that needs to be made is that although air barriers are a good idea everywhere, vapor barriers are not.Does vapor barrier need to be taped?per foot is usually the best thing you can do to reduce crawlspace moisture. Cover the dirt crawlspace with a plastic moisture polyethylene vapor barrier. Overlap any seams and tape them. of rigid, moisture-proof insulation.

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