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50 Eco-Friendly Products Selected by Green Builder's Editors


CertainTeed MemBrain smart vapor retarder film

Posted by Juliet Grable

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Feb 17, 2014 6:43:00 PM


Designed for application over unfaced fiberglass insulation, MemBrain looks like polyethylene, but is actually a polyamide-based material. What makes this product unique is its ability to adapt its permeability to varying climatic conditions. In winter or low humidity, MemBrain resists water vapor, behaving like a traditional vapor retarder. As the relative humidity increases, so does MemBrain’s permeability, allowing water vapor to escape the wall cavity and helping buildings dry out.

Topics: Insulation, vapor retardant