Uploaded July 2025 | Updated September 2026, 1 hour ago

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Learn about perm ratings and their importance in construction. This video explains how perm ratings describe a material's vapor permeability, which impacts the drying potential of building assemblies. Discover the different classes of vapor retarders and permeable materials, and understand how to select the right perm rating for your building projects.

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Music by: bensound.com
License code: BQQU3OKZMMOUBLOF
Artist: : Benjamin Tissot