Made with 100% composite materials and manufactured without adhesives, Composite Structural Insulated Sheathing optimizes building strength and air quality while earning LEED points and NAHB green certification. Fiberglass reinforced thermoset skin is impervious to moisture and is bonded by chemical reaction to polyurethane foam insulation during manufacturing, eliminating delamination. Continuous polyurethane foam adds R-6 insulation in 1 1/8 in. sheathing and R-12 in 2 1/8 in. sheathing.