REDZONE AIR AND VAPOR BARRIER MEMBRANE is a 1 mm (40 mils) self-adhesive membrane composed of elastomeric SBS bitumen and trilaminate woven polyethylene. The underface is composed of a silicone film easily detachable. It seals air and vapour around door and window frames as well as around roof details.BenefitsSelf-adhesive: quick, cost-effective and easy installationMeets door and window installation standards (CSA A440.4-07)Self-sealing around screws and nailsMade in Canada