ULC 742 PDF 2020

This Standard provides air barrier assembly performance requirements and test methods to determine the performance levels for an air barrier assembly used in applications for both low-rise and high-rise buildings.
The test methods described in this Standard involve measuring the air leakage rate of a representative test specimen of an air barrier assembly before and after exposure to wind pressure loading cycles and then determining an air leakage rate at a reference pressure difference (ΔP), based on the measurements.
This Standard sets minimum performance requirements for air barrier assemblies based on wind pressure loading and height of the building.
The requirements for determining the air leakage rate of air barrier materials, air barrier components and air barrier accessories are outside the scope of this Standard.
The structural design for the transfer of loads from the air barrier assemblies to the building structure is outside the scope of this Standard.
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.