Schluter® KERDI-BOARD KITThe KERDI BOARD KIT bundles everything you need to build waterproof walls and niches in a shower or wet area panels, screws, washers, and sealing band in one box. It's designed for the DIYer or installer who wants to skip the guesswork of buying components separately and just get the right stuff in the right quantities. KERDI BOARD is Schluter's lightweight, waterproof building panel. It replaces cement board, drywall, and plywood as a tile substrate