MemBrain™ Innovative Vapor Retarder and Air Barrier Film
MemBrain™ is intended for use with unfaced, vapor permeable mass insulation (fiber glass and mineral wool) in wall and ceiling cavities. MemBrain is polyamide film whose permeability changes with ambient humidity conditions. In winter, when humidity is generally lower, MemBrain works to block the passage of moisture, reducing the likelihood of condensation on cold surfaces within the construction cavity. With higher humidity, whether caused by seasonal changes or moisture intrusion, MemBrain expands, increasing its permeability and allowing a closed building system to increase its drying potential. MemBrain can be installed as a traditional vapor retarder or as a continuous interior air barrier.> Click here to obtain more product literature from the CertainTeed website.