DEXcell® Glass Mat Roof Board is a mold resistant gypsum board designed for use as a cover board and/or thermal barrier in commercial roofing applications. DEXcell Glass Mat Roof Board is ideally suited for mechanically fastened roof systems. DEXcell Glass Mat Roof Board is a fire barrier and thermal barrier manufactured with coated fiberglass facers and an enhanced mold resistant gypsum core. DEXcell Glass Mat Roof Board scores and cuts easily and is specially coated on the front, back and sides for easy handling.