: It combines multiple steps (sheathing, WRB, and exterior insulation) into a single installation, which can be faster and cheaper than applying separate layers.
: A layer of high-quality OSB that provides shear strength. 1.5.zip
: A 1-inch thick layer of polyisocyanurate (polyiso) foam bonded to the back of the OSB. : It combines multiple steps (sheathing, WRB, and