Durock 1/2 In. x 4 Ft. x 8 Ft. Cement Board (Tile Backer)Durock 1 2" 4'X8' Cement Board (Tile Backer) MADE TO STAND STRONG SO YOU CAN REST EASY. USG DUROCK BRAND CEMENT BOARD For more than 30 years, USG Durock Cement Boards have set the standard for proven performance in the backerboard category. Theyre water durable, mold resistant and provide a tile bond superior to both fiber cement boards and bare plywood, making USG Durock Cement Board the perfect choice for a wide variety of interior and exterior