The Ontario Building Code | Air Barrier System Properties
9.25.3.2. Air Barrier System Properties
(1) Sheet and panel type materials intended to provide the principal resistance to air leakage shall have an air leakage characteristic not greater than 0.02 L/(s∙m2) measured at an air pressure differential of 75 Pa.
(2) Where polyethylene sheet is used to provide the air-tightness in the air barrier system, it shall conform to CAN/cgsb-51.34-M, "Vapour Barrier, Polyethylene Sheet for Use in building Construction".
In Plain Language
An air barrier system must meet specific performance properties set out in this article, ensuring it's airtight, durable, and structurally supported over the building's service life.
This is a plain-language summary of the 2012/2017 Ontario Building Code text above, for general understanding only and not a substitute for the Code. Always confirm current requirements against the 2024 edition (O.Reg. 163/24) or a qualified professional before construction.