9.25.3.2. Air Barrier System Properties

(See Note A-9.25.5.1.(1))

(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 airtightness in the air barrier system, it shall conform to CAN/CGSB-51.34-M, “Vapour Barrier, Polyethylene Sheet for Use in Building Construction.”