Shower Installation Guide

14 INSTALLATION — Shower Assembly with Mortar Base
INSTALLATION
Shower assembly with mortar base
Please refer to the Schluter
®
-Systems installation video in addition to reading the instructions below.
Note: Schluter
®
-Systems recommends installing
the KERDI-DRAIN according to step 3a 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.
Place a ring of loose mortar up to the inlet
hole in the floor and firmly press the drain
into the mortar. The bonding flange must be
fully supported to prevent damage to the tile
assembly (e.g., cracked grout around drain).
3a
1"
(25 mm)
min.
When KERDI-DRAIN must be set by the
plumber prior to the mortar bed (or when there
is no access to the plumbing from below),
the KERDI-DRAIN is connected to the waste
line and set at the desired height. When
installing KERDI-DRAIN over wood substrates,
the minimum thickness of mortar required at
the perimeter of the bonding flange is 1" (25
mm). Before installing the mortar bed, pack
loose mortar under the drain up to the inlet
hole to ensure solid and uniform support of the
bonding flange.
3b
Fill the remainder of the shower base with
mortar. Slope the mortar bed using the
bonding flange and the perimeter screed as
a screeding guide. As soon as the mortar bed
can be walked upon, waterproofing with the
KERDI membrane can begin.
4
Construct floor/wall and wall/ceiling* con-
nections and seal vertical inside corners using
the KERDI-BAND waterproofing strip or 5"
(125 mm)-wide cut sections of KERDI water-
proofing membrane. Install KERDI-KERECK-F
pre-formed corners at inside corners.
*Applies when installing KERDI on the ceiling. KERDI
application on ceiling is required for steam showers and
optional for showers and tub surrounds.
5
Apply unmodified thin-set mortar to the shower
base. When using the ABS or PVC drain,
apply additional unmodified thin-set mortar
to the top of the fleece-laminated bonding
flange. When using the stainless steel drain,
KERDI is adhered to the bonding flange with
the KERDI-FIX adhesive/sealant. The stainless
steel bonding flange must be clean and free of
grease or other contaminants prior to KERDI-
FIX application.
6
Apply the KERDI membrane to the entire
surface of the mortar bed. The KERDI is carried
to the step in the bonding flange (template
provided). Be sure the connection between the
KERDI and KERDI-DRAIN is secure.
7
After locating the correct position for the drain,
cut a hole in the substrate using the template
provided. Note: A larger hole can lead to lack
of support and damage to the tile assembly
(e.g., cracked grout around the drain).
1a
Fill in box-outs in concrete floors with dry-pack
mortar. A 4" (100 mm)-diameter plastic pipe
coupling or similar can be used as a form around
the waste line. Select form to accommodate the
KERDI-DRAIN bonding flange. Limit the hole
diameter to 5" (125 mm) maximum to ensure
proper support of the tile assembly.
1b
Place a mortar screed around the base of
the shower.
2