USG Durock™ Brand UltraLight Foam Tile Backerboard is a strong, lightweight, waterproof, and vapor retardant tile base for wet areas.USG Durock™ Brand UltraLight Foam Tile Backerboard offers architects, builders, and tile contractors a strong, lightweight, waterproof and vapor-retardant tile base for wet areas. USG Durock™ UltraLight Foam Tile Backerboard cuts easily with a utility knife and is dust-free. It also fastens without washers and is ideal for use with the USG Durock& …