Schluter® KERDI-TUBKIT 7 SQ. METERMost people assume a bathtub surround is automatically waterproof the tub is a big waterproof pan, so surely the walls above it are fine, right? They're not. Standard cement board or drywall behind tile in a tub surround gets wet, stays wet, and eventually fails. The Schluter KERDI TUBKIT is the fix: a complete waterproofing kit for tiled bathtub surrounds that creates a bonded, sealed membrane behind every inch of tile. The KERDI TUBKIT contains all