LISTEN...

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:

• Plywood and OSB sheathing are well understood, providing installation with broad coverage.
• Pay attention to continuity at transitions like corners, openings and intersections. 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.
• Managing bulk water in the form of rain, snow and ice is critical. Make use of weather resistant barriers, sealant tapes and solid flashing.
• Use manufacturer recommended adhesives and preparatory coatings on plywood and OSB for peel-and-stick layers and tapes.