Durock™ Glass-Mat Tile Backerboard is a water-resistant, easy to use panel for walls, floors, and ceilings. Durock™ Glass-Mat Tile Backerboard consists of a treated water-resistant gypsum core that is covered with a coated fiberglass mat facer and back and has a proprietary surface making it ideal for use in wet areas as a tile substrate. Durock™ Glass-Mat Tile Backerboard combines the tile bond of cement board with the handling and ease of use of a Sheetrock® Brand panel.