STS NoMorePly 6mm PrePrimed Backer Board 1200 x 600mm Half Pallet (75 Boards)Developed to strengthen timber floors before tiling, NoMorePly 6mm PrePrimed Tile Backing Boards prevent tiles and grout lines cracking by removing the bounce or deflection in timber floors caused by the weight of footfall. The NoMorePly 6mm PrePrimed Tile Backing Boards are also water resistant, unlike plywood which weakens when damp. Slim 6mm PrePrimed Tile Backing Boards provide the same rigidity and strength as 18mm plywood and so reduce the step