Perm-A-Barrier 50 ft. x 9 in. 40 F Aluminum Wall Flashing PERM-A-BARRIER 9" x 50' Aluminum Wall Flashing Perm-A-Barrier Aluminum self-adhered flashing is composed of durable, high density polyethylene aluminum surfaced sheet, cross-laminated, backed by an aggressive, pressure sensitive rubberized asphalt adhesive. Perm-A-Barrier Aluminum Flashing provides extended UV exposure and improved sealant adhesion to the film. Perm-A-Barrier Aluminum Flashing is ideal for protecting and sealing critical areas of the building superstructure from the damaging effects of the elements. By minimizing air and water vapor flow through the building exterior at transition areas. It Seals transition and detail areas to provide a continuous air barrier. It Prevents premature deterioration of the building envelope. Fire-resistant meets NFPA 285 as part of various wall assemblies with foam plastic insulation Fully bonded transmits wind loads directly to the substrate Water-proof and virtually impermeable to moisture virtually impermeable to the passage of liquid water and vapor 9 in. (225 mm), 50 linear ft per roll, 9 lbs/roll Temperature Rating 40 Tensile Strength 400 Thickness 0.041 Water Absorption 0.1% Material Aluminum (description exceeds maximum possible length)