Aggregated portland cement board with polymer-coated, glass-fiber mesh on both front and back faces and edges. The lightest cement board by up to 25%. The easiest cement board to score and snap which reduces installation time by up to 20%. For use in bath areas, floors, and countertops when installing ceramic tile, slate, thin-brick veneer, stucco, or other similar surface systems. Dimensionally stable, can be used in wet areas where it has a significant ability to remain unaffected by prolonged exposure to moisture. 30 year limited warranty. 3' W. x 5' L. For interior use.