Flash-Vent™ Copper Drainage Plane Flashing has been designed with a flexible 3oz. or 5oz. sheet of copper laminated on one side to a polymer fabric and drainage fabric on the opposite side. Flash-Vent™ does not clog, eliminating the need for mortar netting. Flash-Vent™ is compatible with air barriers, spray polyurethane foams, insulation and construction sealants. Flash-Vent™ has a life of the wall warranty.