Shower Installation Guide

STEAM SHOWER ASSEMBLY — Schluter
®
-KERDI-SHOWER-ST or mortar base 9
Areas of application
Interior steam showers
Over wood or concrete subfloors
Areas requiring disabled access/ barrier-free applications; see page 18
Limitations
Certain glass tiles may not be compatible with bonded waterproof
membranes and/or may require special setting materials. Consult glass
tile manufacturer and Schluter
®
-Systems for more information.
Certain moisture-sensitive stones, e.g., green marble, or resin-backed
tiles, may not be appropriate for use in wet areas such as steam showers
or may require special setting materials. Consult stone supplier and
Schluter
®
-Systems for more information.
Gypsum-based solid backing panels shall be limited in use to residential
steam showers (i.e., no commercial steam rooms).
Do not use sawn lumber curbs on concrete subfloors subject to moisture
migration.
Requirements
Plywood, OSB, or concrete subfloor must be clean, even, and load
bearing.
Provide insulation in wall and ceiling cavities to reduce moisture
condensation on the tiled surface.
Solid backing – gypsum wallboard, cementitious backer unit, fiber-
cement underlayment, fiber-reinforced water-resistant gypsum
backerboard/underlayment, coated glass mat water-resistant gypsum
backerboard, portland cement mortar bed, concrete, or masonry
Base – Schluter
®
-KERDI-SHOWER-ST or portland cement mortar bed
Curb – Schluter
®
-KERDI-SHOWER-SC, concrete, masonry block, or
sawn lumber sheathed with solid backing (see above)
Bench – Schluter
®
-KERDI-SHOWER-SB, concrete, masonry block, or
sawn lumber sheathed with solid backing (see above)
Schluter
®
-KERDI-DRAIN shall be properly supported.
Schluter
®
-KERDI-DRAIN shall be connected to the waste line; use ABS
cement for ABS drains, PVC cement for PVC drains, and a flexible or
no-hub connector for stainless steel drains.
Slope ceilings 2” per foot minimum to avoid condensation from dripping
onto occupants (may be sloped to center to minimize rundown on walls).
Install Schluter
®
-KERDI waterproofing membrane on all surfaces,
including the ceiling.
Any protrusions through the KERDI membrane (e.g., showerhead, mixing
valve, steam inlet, etc.) must be treated with Schluter
®
-KERDI-SEAL-PS
and Schluter
®
-KERDI-SEAL-MV seals, Schluter
®
-KERDI-FIX, or equivalent
sealant.
Movement joints shall be provided at all changes in plane, including floor/
wall, wall/wall, and wall/ceiling transitions. Schluter
®
-Systems
prefabricated movement joint profiles (e.g., Schluter
®
-DILEX-EKE) provide
a maintenance-free alternative to sealant; see page 21.
When using the stainless steel Schluter
®
-KERDI-DRAIN casing, use
Schluter
®
-KERDI-FIX to bond Schluter
®
-KERDI to the integrated
bonding flange.
Substrate Preparation
Verify that subfloor panels and solid backing are properly fastened to
framing members.
Any leveling of the subfloor must be done prior to installing Schluter
®
-
KERDI-SHOWER-ST/-SC/-SR/-SB.
Solid Backing Materials
Gypsum wallboard – ASTM C1396/C1396M
Cementitious backer unit – ANSI A118.9 or ASTM C1325
Fiber-cement underlayment – ASTM C1288
Fiber-reinforced water-resistant gypsum backerboard/underlayment –
ASTM C1278
Coated glass mat water-resistant gypsum backerboard – ASTM C1178
Portland cement mortar – ANSI A108.1B
Concrete
Masonry
Setting and Grouting Materials
Unmodified thin-set mortar – ANSI A118.1
Grout – ANSI A118.6, A118.7
Installation Specifications
Solid backing panels – follow manufacturer’s instructions
Portland cement mortar bed – ANSI A108.1B
Tile – ANSI A108.5
Grout – ANSI A108.6, A108.10
Other Considerations
When Schluter
®
-KERDI and tile are installed on the ceiling, the solid
backing and fasteners must be able to support the load of the tile and
setting/grouting materials.
Prior to setting tile, wait 24 hours minimum before water testing to allow
for final set of thin-set mortar and ensure waterproof performance at
seams and connections.
Schluter
®
-Systems profiles may be used to finish and protect outside
corners and eliminate the use of sealant at inside corners; see pages
21-22.
Steam showers - Ceramic or stone tile
Schluter
®
-KERDI-SHOWER-ST or mortar base
K-SSH-12
"