Patent ID: 7520097

Claim:
A water management building wrap, the building wrap being for use between a frame structure of a building and an exterior building covering, said building wrap comprising: a permeable membrane disposable over at least a portion of the frame structure, the membrane, when the membrane is disposed over the frame structure, having a first side facing the frame structure and a second side facing away from the frame structure; and a drainage structure secured to the second side of the membrane, the drainage structure including a plurality of generally vertical members having a first thickness and spaced apart from each other such that adjacent pairs of the generally vertical members form boundaries for a generally vertical water drainage channel, the drainage structure further including a plurality of generally horizontal members attached to the generally vertical members and having a second thickness less than the first thickness, the drainage structure being an extruded polymeric material forming integral joints at intersections of the generally vertical members and the generally horizontal members, the joints providing dimensional stability to maintain the orientation of the generally vertical members and form stable vertical water drainage channels; wherein the polymeric drainage members comprise a core of polypropylene and an outer layer, surrounding at least a portion of the core, of ethylene vinyl acetate.