Schluter® KERDI-SHOWER-TRAY Shower BaseBuilding a shower floor the old way means floating a mortar bed, sloping it toward the drain, waiting for it to cure, waterproofing it, then finally tiling. The KERDI SHOWER TRAY cuts all of that out. It's a pre sloped EPS foam base with integrated KERDI waterproofing set it in thin set, and you tile the same day. Available in multiple sizes and configurations: the standard T series (center drain), TS (off center, for bathtub replacements), and TT