Shower Installation Guide

12 INSTALLATION — Shower Assembly with Prefabricated Tray and Curb
INSTALLATION
Shower assembly with prefabricated tray and curb
Please refer to the Schluter
®
-Systems installation video in addition to reading the instructions below.
After locating the correct position for the drain,
cut a hole in the substrate using KERDI-
SHOWER-ST tray as a template. Note: A
larger hole can lead to lack of support and
damage the tile assembly (e.g., cracked grout
around 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 accom-modate the KERDI-DRAIN bonding
flange. Limit the hole diameter to 5" (125 mm)
maxi-mum to ensure proper support of the tile
assembly.
1b
Apply unmodified thin-set mortar to the
substrate using a 1/4" x 3/8" (6 mm x 10 mm)
square- or U-notched trowel. The floor must
be level. Any leveling must be done prior to
placing the tray.
Note: When the Schluter
®
-KERDI-DRAIN must
be installed prior to the Schluter
®
-KERDI-
SHOWER-ST tray, see step 10b.
2
Place the KERDI-SHOWER-ST tray and solidly
embed in the mortar.
3 4
Check the underside of the tray to ensure that
full coverage and support are achieved.
Construct tray/wall and wall/ceiling* connections
and seal vertical inside corners using the KERDI-
BAND waterproofing strip or 5" (125 mm)-wide
cut sections of KERDI waterproofing 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
Protect walls and ceiling* from moisture and
vapor penetration using KERDI. Seams are
constructed by overlapping the edges of KERDI
by 2" (50 mm) minimum or by butting adjacent
sheets of KERDI and installing KERDI-BAND,
centered over the joint.
*Applies when installing KERDI on the ceiling. KERDI appli-
cation on ceiling is required for steam showers and optional
for showers and tub surrounds.
6
Install KERDI-SEAL-PS pipe seals at shower-
head, body sprays, etc. and KERDI-SEAL-MV
mixing valve seal at the mixing valve. As an
alternative, KERDI-FIX or equivalent sealant can
be used to seal pipe protrusions and protect
moisture-sensitive solid backing panels at the
mixing valve.
7
OPTION: Walls can be waterproofed with
Schluter
®
-KERDI prior to the installation of tray.
Floor/wall connections are constructed with
Schluter
®
-KERDI-BAND after installing the tray.
8
KERDI, KERDI-BAND, KERDI-KERECK-F, KERDI-SEAL-PS, and KERDI-SEAL-MV are installed using unmodified thin-set mortar (mixed to a fairly fluid consistency, but still able
to hold a notch). Dampen particularly dry and porous substrates in order to help prevent premature drying or skinning of the thin-set mortar. Apply the thin-set mortar using a
1/4" x 3/16" (6 mm x 5 mm) V-notched trowel or the Schluter
®
-KERDI-TROWEL, which features a 1/8" x 1/8" (3 mm x 3 mm) square-notched design. Embed the membrane into
the mortar throughout its entire surface to ensure proper adhesion and to remove air pockets. Periodically lift up a corner to check the fleece for full coverage. The sequence
of membrane installation can vary provided that a minimum 2" (50 mm) overlap is maintained at all joints and proper connection to the KERDI-DRAIN is established. Note:
Top-over-bottom or shingle laps of the membrane are not required.
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.
KERDI-SEAL-PS/-MV KERDI-FIX
Note: If using the KERDI-SHOWER-SB bench, apply
unmodified thin-set mortar to the floor and walls using
a 1/4" x 3/8" (6 mm x 10 mm) square- or U-notched
trowel. Solidly embed the bench in the mortar.
Check the underside and backsides of the bench to
ensure that full coverage and support are achieved.