Schluter®-KERDI-BOARD (1/2")KERDI BOARD (1 2" thick) is Schluter's waterproof building panel a lightweight alternative to cement board that eliminates the need for a separate waterproofing membrane. The panel itself is the substrate AND the waterproofing, which simplifies shower and wet area construction significantly. At 1 2" thick, this is the standard panel for most shower wall applications. It screws directly to wood or metal studs, gets sealed at the seams with KERDI BAND,