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".