CAN/ULC-S741-08(R2020)

1.1 This Standard provides the requirements and test methods for air barrier materials used in building applications. 1.2 The test method involves measuring the airflow through representative samples of the material for a range of differential pressures, and calculating an assigned air leakage characteristic of the material at a reference pressure difference (?P) of 75 Pa. The test methods for air barrier materials in this Standard do not include consideration of the means of attachment. 1.3 The requirements for the air leakage characteristic of air barrier components and air barrier accessories were not considered in the development of this Standard. Note: See Annex B for a discussion of air barrier assemblies and air barrier systems and the relationship with air barrier materials, air barrier components and air barrier accessories. 1.4 The materials meeting this Standard are intended to be exposed to a maximum of 50 °C service temperature. 1.5 This document does not purport to address all the health and safety aspects associated with its use. Anyone using this Standard has the responsibility to consult the appropriate authorities and to establish health and safety practices, in conjunction with any existing applicable regulatory requirements, prior to its use.