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Plywood and OSB are used mainly as structural sheathing to provide shear strength to wall, floor and roof assemblies. Because some thicknesses of sheeting can resist air flow, these common products may act as an air barrier with proper application.

Important considerations for Plywood and OSB air barrier applications:

• Offers well understood installation with broad coverage
• Pay careful attention to continuity at assembly transitions - this might require a material change which may make air barrier continuity challenging.
• Plan carefully for vapour control and moisture profile of assemblies - the position of solid components may affect the dew point and cause condensation problems.
• May need additional layers for water / weather resistance on exterior application.
• Use the appropriate adhesives and preparatory coatings on plywood and OSB for peel-and-stick layers and tapes.