ROCKWOOL COMFORTBOARD™ 80 is a rigid mineral wool insulation sheathing board that is non-combustible, water-repellent, fire-resistant and sound absorbent COMFORTBOARD™ 80 is an exterior non-structural insulation sheathing that provides a continuous layer of insulation around the commercial or residential building envelope. This product is specifically engineered as exterior non-structural insulation sheathing for high performance commercial or residential wall systems. Properties: Can be easily cut with a bread knife Non-combustible with a melting point of approximately 1177°C (2150°F) Excellent sound absorbency Vapor permeable Does not rot or promote the growth of fungi or mildew Low moisture sorption Chemically inert; non-corrosive Water-repellent CFC- and HCFC-free product and process Made from natural & recycled materials ROCKWOOL® can contribute to earning LEED® points