US Patent 7882673 Single-ply masonry flashing

A masonry flashing is disclosed having a polymeric membrane and a pressure-activated adhesive in a peel-and-stick product. The flashing is used in cavity walls, typically a wall with an inner wythe of masonry block and an outer wythe of brick. The adhesive layer is a hot melt with various additives, which additives provide reinforcement to the flashing structure. The reinforcement can be fiber glass or filamentous fragments of polypropylene that are admixed into the adhesive. The flashing has a release sheet and, after removal thereof, the adhesive is pressed against the rough surface of the masonry block creating a durable bond with the inner wythe. Incorporated into the masonry flashing are various high-strength, polymeric webs including a spun-bonded polyolefin, an ethylene propylene diene terpolymer, and a polyvinylchloride with an ethylene interpolymer.