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House wrap is sealed at all seams and overlaps flashing to serve as a continuous drainage plane over the exterior walls.
Install all layers of the drainage plane to overlap, not underlap, to direct bulk water down and out of the wall.
Right – The building felt is installed on all exterior walls and provides a complete drainage system
Right – The rigid insulation covers all exterior walls and all seams are taped to provide a complete drainage system
Right – The water-resistant barrier covers the entire house and the seams are taped to provide a complete drainage system
Wrong – The rigid sheathing seams are not taped and the gaps could cause moisture problems
Wrong – The water-resistant barrier is not complete and the holes and gaps could cause moisture problems
Wrong – There is not a water-resistant barrier installed underneath the exterior finish of the walls