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Vapour-permeable air barriers appeared quite recently in the North American market. Today, there are dozens of products to choose from, featuring an extensive range of vapour permeance.
Selecting the appropriate combination of materials is crucial to avoiding moisture-related problems in wall assemblies. This is especially true in certain circumstances where highly permeable air barriers can increase the risk of moisture build-up in walls.
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Become an expert in permeance

Have a critical look at the discussions about perms

Choose the right vapour-permeable air barriers for future projects

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READ THIS WHITE PAPER TO BECOME AN EXPERT IN PERMEANCE
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