Schluter® KERDI-BOARD-SB Shower BenchA built in shower bench that won't rot, swell, or grow mold because it's made from KERDI BOARD, the same fully waterproof building panel used throughout Schluter shower systems. No mortar float, no custom framing with moisture concerns, no wondering if that wood blocking inside the wall is holding up five years from now. KERDI BOARD SB comes pre fabricated to the right dimensions for a standard shower seat. It's tile ready straight out of the box