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Air Barrier vs Vapour Barrier

The difference between air barrier and vapour barrier systems is often misunderstood.  These are two distinct components of a building’s assembly, and both have a different purpose. The function of an air barrier is to stop air leakage between a conditioned space and an unconditioned space, while the vapour barrier prevents the diffusion of vapour through an assembly. The National…
Vanessa Ha
February 19, 2021