Sheetrock Brand Glass-Mat Panels Mold Tough Firecode X are a high-performance interior wall panel with moisture and mold resistance. Ideal for new construction or renovation projects, the panels are optimal in the pre dry-in application of wallboard before the building envelope is enclosed and can be used in protected exterior soffit applications. The new product features a non-combustible moisture- and mold-resistant gypsum core encased in an inorganic fiberglass mat that sheds water and has tapered edges for easy finishing. They are UL classified as to fire resistance and easily score and snap, allowing a quick and easy installation with no sawing or special tools required. The facer mat is colored to match traditional drywall and is engineered to accept the application of USG finishing systems.