Schluter® KERDI - Sloped Shower Tray - 38" x 60"Building a mortar shower bed is a skilled trade it takes experience to float a correctly sloped mud bed, and a bad slope means standing water, which means mildew and ongoing problems. The KERDI SHOWER T tray skips all that. It's a pre sloped EPS foam base that you set in thin set mortar and tile directly over. No mud bed. No waiting for it to cure. No getting the slope wrong. The 38" 60" tray fits a long, narrow shower a common footprint for bathroom