Made with a permeable vapour retarder, CertainTeed’s SmartBatt is a fibreglass thermal barrier that guards against moisture build-up. Suited to bathrooms, basements and exterior walls, SmartBatt has an integrated MoistureSense facing that, under normal conditions, blocks out moisture. When humidity is high, the permeability increases to let vapour escape. This product is Greenguard Gold Certified for low chemical emissions and Class A fire rated.