The tray's new detachable center section can be removed and placed below the bonding flange to dry fit the Kerdi-Drain to the appropriate height. To install the Kerdi-Shower-ST when the drain has already been installed, apply sufficient thin-set mortar to the top and bottom of the detached center section before sliding it into place below the drain, to ensure solid and uniform support of the bonding flange.

Schluter-Systems recommends installing the Kerdi-Shower-ST prior to setting the Kerdi-Drain whenever possible. This method affords the installer greater control over the final position of the drain, and makes it easier to obtain full support of the bondage flange.