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 Mold thrives when three factors are present inside wall cavities: air circulation, moisture and a nutrient base. All three factors are typically found in fiberglass-insulated exterior walls.
Of the three, moisture is by far the most significant factor leading to mold. That’s why Building Codes require the installation of a vapor barrier. A vapor barrier is any material that stops passage of moisture through wall, ceiling and floor assemblies of buildings. It prevents interior moisture (generated from bathing, cooking, washing and even breathing) from penetrating into and condensing in unheated attics, basements, crawlspaces, and wall cavities.
Unfortunately, the vapor barriers commonly used today just don’t do the job properly. Materials such as 6 mil poly, at best, act merely as a vapor “retarder”, slowing moisture down, but never stopping it. Let’s examine why.
Pages
Part 1 - Why Mold Grows
Part 2 - Typical 6-mil Poly Vapor Barrier Installation
Part 3 - How SIPs Prevent Mold Growth
Part 4 - The Best Insurance is Prevention
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