Waterproof Folly: Wary of a Double Vapor Barrier for a PWF – Causes, Tests & Fixes
Introduction A double vapor barrier on a PWF is usually unnecessary and can trap moisture between layers. In plain terms, two barriers give moisture nowhere to go and can lead to damp spots and mold. Check the wall assemblies and follow manufacturer guidance when in doubt. What to test: look for damp spots, water staining, […]
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