Patent ID: 8046956

Claim:
A cavity wall flashing system comprising a cavity wall having an inner wythe and an outer wythe with a cavity therebetween, said cavity wall having an exterior surface on the side of said outer wythe opposite said cavity, said cavity wall flashing system comprising: a flashing, said flashing lining said inner wythe and extending through said outer wythe to said exterior surface, said flashing further comprising: a sulcated flexible membrane having two major surfaces and a longitudinal axis, said sulcated flexible membrane comprising: a plurality of channels having continuous and uninterrupted channel walls in at least one of said major surfaces of said flexible membrane, each of said plurality of channels transverse said longitudinal axis and coextensive with said flexible membrane, and extending continuously from said cavity to said exterior surface providing a conduit for air to flow into and out of said cavity and for water to flow out of said cavity; an adhesive layer disposed on one of said major surfaces of said flexible membrane; and a protective member extending over at least a portion of each said plurality of channels precluding the blocking thereof by mortar droppings and construction debris, said protective member permitting water to flow into each of said plurality of channels.