Part of the Kerdi Shower system, which includes polystyrene shower curbs and waterproofing membrane for use under ceramic tile, the Kerdi Shower Tray is a polystyrene tray used in place of a mortar base. Pricing varies by size and whether the drain is centered or offset. A 48-by-48-inch tray with a center drain costs $90; the 72-inch-square tray shown is $200. Schluter, 800.472.4588,

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