Tile Shower - Installation Instructions using Prefabricated Tray

Schluter Materials Required for this Installation:

KERDI-DRAIN, KERDI waterproofing membrane, KERDI-BAND waterproofing strip, KERDI-SHOWER-ST prefabricated tray, and KERDI-SHOWER-SC prefabricated curb.  (See picture 1)

Note: The type of bonding mortar used to apply KERDI must be suitable for the substrate. Generally, an unmodified thin-set mortar is used. Unmodified thin-set mortar must be used to construct all KERDI seams and to apply tile over the KERDI membrane.

Schluter materials required for this installation.

After locating the correct position for the drain, cut a hole in the substrate using KERDI-SHOWER-ST tray as a template.

Apply thin-set mortar to the substrate using a 1/4" x 3/8" square- or U-notched trowel. Note: The floor must be level. Any leveling must be done prior to placing the tray.

Note: The KERDI-SHOWER-ST tray can be cut to size to fit various applications. Ideally, the tray should be cut by equal amounts on all four sides to ensure a consistent height of the first course of wall tile. The shower base can also be extended past the perimeter of the shower tray using dry pack mortar.

Place the KERDI-SHOWER-ST tray in the mortar.

Ensure that the tray is solidly embedded in the mortar.

Check the underside of the tray to ensure that full coverage is achieved.

Note: Schluter-Systems recommends installing the KERDI-SHOWER-ST tray prior to setting KERDI-DRAIN whenever possible. This allows greater control over the final position of the drain and makes it easier to obtain full support under the bonding flange.

If there is access to the plumbing from below and the waste line can be connected after installing the KERDI-DRAIN, apply dry-set mortar to the entire tray surface using a 1/4" x 3/16" V-notched trowel, making sure to completely fill the step in the tray.

The KERDI-DRAIN is pressed firmly into the thin-set mortar, ensuring full support of the bonding flange.

When KERDI-DRAIN must be set prior to the Schluter-KERDI-SHOWER-ST tray. See instruction below.

Note:  When KERDI-DRAIN must be set by the plumber prior to the Schluter-KERDI-SHOWER-ST tray (or when there is no access to the plumbing from below), install the KERDI DRAIN to the appropriate height using the detachable center section (see figure 12-1) of the tray or the foam spacers (figure 12-2) included with the drain.  Before installing the KERDI-SHOWER-ST tray, apply thin-set mortar to the substrate and to the top and bottom of the detached center section.  Slide the cetner section into place below the drain to ensure solid and uniform support of the bonding flange.  

Apply additional unmodified thin-set mortar to the top of the fleece-laminated bonding flange.

Embed the KERDI waterproofing membrane into the mortar and work the matting onto the entire surface of the tray to ensure proper adhesion and to remove air pockets. Be sure the connection between the KERDI and KERDI-DRAIN is secure and watertight.

If necessary, cut the KERDI-SHOWER-SC curb to length using a handsaw.