Schluter®-KERDI-BOARD (2")KERDI BOARD (2" thick) is the heavy duty version of Schluter's waterproof building panel. While the 1 2" panel is for wall substrate applications, the 2" panel is for structural builds shower benches, niches, curbs, partition walls, countertop substrates, and anywhere you need both waterproofing and dimensional thickness. Same technology as the thinner version: extruded polystyrene foam core, reinforced cementitious coating on both sides, completely