Can Schluter®-KERDI-SHOWER and Schluter®-KERDI-BOARD-SC prefabricated substrates such as shower trays, curbs, ramps and benches be installed over existing tile?

Schluter-KERDI-SHOWER and Schluter®-KERDI-BOARD-SC prefabricated substrates (tray, curb, ramp, and bench) can be installed over existing tile coverings.

The following requirements must be met for a successful installation: the substrate must be even and load bearing, the existing tile must be well bonded ensuring removal of any loose tile, and the tile must be cleaned before the shower substrate installation.

KERDI-SHOWER and Schluter®-KERDI-BOARD-SC prefabricated substrates are installed with Schluter SET™, ALL-SET™, FAST-SET™ or unmodified thin-set mortar as per the Schluter®-Shower Installation Handbook. All other requirements found in the Handbook still apply.