KERDI-SHOWER-LINEAR-TRAY Schluter-KERDI-SHOWER-LT/-LTS are prefabricated expanded polystyrene sloped trays with integrated KERDI waterproofing specifically designed to accept the KERDI-LINE linear drain. The trays are available in 39" x 39" (100 cm x 100 cm), 55" x 55" (140 cm x 140 cm), 48