Waterproof Backerboard

USG Fiberock Aqua­Smart Tile Backerboard is a gypsum fiber panel with a uniform, waterproof composition throughout. It was able to withstand hydrostatic pressure testing with no visible penetration over 48 hours, according to the manufacturer. With a 0.42-inch thickness, the backerboard is compatible with modern substrates. The manufacturer says that it weighs less than traditional backerboard and has a Class A fire rating. Recommended applications include under tile, stone, vinyl, hardwood flooring, laminate flooring, carpeting, and countertops. When used for walls, it can be painted. usg.com