Cem-Rock® eXtreme FLOOR represents a quantum shift in flooring technology and has been developed to rapidly improve flooring technology. Its fire, water, mould and mildew resistance properties far outweigh any competing products like plywood or OSB floor sheathing. It provides a superior flooring solution that is unaffected by environmental exposure during construction. is reducing the risk of fire, is not affected by adverse weather conditions, and drastically improves your building’s structural performance. All boards are reinforced with fiberglass mesh and faced with non-woven cloth.