CertainTeed MemBrain 9 ft. W X 100 ft. L X 2 mil Air Barrier and Smart Vapor Retarder Roll 933 sq ft

For extra protection against moisture, the MemBrain Continuous Air Barrier and Smart Vapor Retarder is your weapon of choice. It lets wall cavities dry out, to help prevent mold. In summer, when humidity is high, it increases permeability so that moisture can escape, as air tightness is maintained. In winter, when humidity is low, it continues to block moisture. Use MemBrain with un-faced insulation in place of kraft faced insulation or polyethylene. Not all climate zones require vapor retarders. • Unlike traditional vapor retarders, MemBrain helps prevent mold by sensing and adapting permeance to varying humidity throughout the year to keep the wall cavity dry • For use with un-faced insulation as a vapor retarder (aka vapor barrier) in climate zones where one is required • Prevents moisture vapor from entering the wall cavity in the winter • Allows any moisture buildup to escape the wall cavity in the summer • Installs like poly with an extra level of moisture protection • Guards against moisture