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



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.

CertainTeed MemBrain smart vapor retarder film

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