Installation Guide

INSTALLATION — Shower base with Schluter
®
-KERDI-DRAIN 25
Remove the clamping ring from the installed
drain and save the bolts. Align the bolt pattern
of the clamping ring with the adaptor ring and
punch the matching inserts through the adaptor
ring.
1
Apply a continuous 1/4" - 3/8" (6 mm - 10 mm)
bead of KERDI-FIX to the installed drain flange.
Place the adaptor ring on the installed drain,
re-insert the bolts, and tighten evenly. Make
bolts finger-tight plus 1/4 turn; over tightening
may warp the ring and result in leaks. Ensure
complete contact between KERDI-FIX on the
clamping ring drain and the adaptor ring to
prevent leakage.
2
Slide the adaptor flange into the adaptor ring
and ensure full support underneath with mortar
or the detachable center section of the foam
tray. Depending on the installed drain elevation,
it may be necessary to install KERDI-BOARD,
tile backerboard, water-resistant gypsum
backerboard, or similar prior to the tray to ensure
the desired height is achieved. Install the tray as
per the instructions on page 24.
Note: For the KERDI-DRAIN 7-1/2" Adapter
Kit, the extended adapter bonding flange may
be cut to length.
3
Clamping Ring Drain Installed: If a clamping ring drain is installed, replace with KERDI-DRAIN or convert using the KERDI-DRAIN adaptor kit.
Schluter
®
-KERDI-DRAIN with mortar bed
Note: The small, round holes in the outer edges of the KERDI-DRAIN flange are a result of the manufacturing process and are not meant to be used to screw the
flange into place.
Plumbing Access: If there is access to the plumbing from below and the waste line can be connected after installing KERDI-DRAIN, the drain can be installed in
conjunction with the mortar bed.
Place a ring of loose mortar up to the inlet hole in the floor and firmly press the drain into the mortar
and level. The bonding flange must be fully supported to prevent damage to the tile assembly
(e.g., cracked grout around drain). When installing KERDI-DRAIN over wood substrates, the minimum
thickness of mortar required at the perimeter of the bonding flange is 1" (25 mm). When installing
KERDI-DRAIN over concrete substrates, the minimum thickness of mortar required at the perimeter of
the bonding flange is 3/4".
1
The screed is then placed flush with the top
of the bonding flange of the KERDI-DRAIN.
Slope the mortar bed at 1/4" (6 mm) per
12" (305 mm) using the bonding flange and a
perimeter screed as guides.
2
Note: Schluter
®
-Systems strongly recommends a leak test be performed on the connection between the drain and
the waste line prior to continuing with the remainder of the installation whenever possible. Refer to local plumbing
and/or building codes for any specific requirements in your area.