Thermopanel Tile Backer Board Washers: Thermopanel Tile Backer Board Fixing Washers provide an easy and secure way to fix insulation boards to floors and walls, such as Thermopanel, Marmox and Wedi type boards. Tile Backer Board Fixing Washers are countersunk, which allows the screw head to pull into the board but the outer rim of the disc to remain flush with the board surface. Each Thermopanel Tile Backer Board Washer features a perforated surface, which provides maximum board surface exposure. This allows standard adhesives and plasters to adhere to the board surface, minimizing the risk of surface delamination or damage. Being made from 430 Stainless Steel, Thermopanel Tile Backerboard Washers are protected from corrosion and also help to minimise any chance of degradation over time.