Posted on November 26, 2012 by Scott Gibson
in Q&A Spotlight
Unless a builder has opted for a Zip System wall or is willing to ignore building code requirements, a layer of housewrap or building felt typically covers any exterior sheathingMaterial, usually plywood or oriented strand board (OSB), but sometimes wooden boards, installed on the exterior of wall studs, rafters, or roof trusses; siding or roofing installed on the sheathing—sometimes over strapping to create a rainscreen.
before the siding is applied. This water-resistive barrierSometimes also called the weather-resistive barrier, this layer of any wall assembly is the material interior to the wall cladding that forms a secondary drainage plane for liquid water that makes it past the cladding. This layer can be building paper, housewrap, or even a fluid-applied material., or WRB, helps to protect the sheathing from damage in the event that water is driven past the siding.