Shower Installation Guide

SHOWER ASSEMBLY — Mortar base 7
Areas of application
Interior 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 showers or may
require special setting materials. Consult stone supplier and Schluter
®
-
Systems for more information.
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.
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
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.
Schluter
®
-KERDI waterproofing membrane shall be installed up to the
height of the showerhead at minimum.
Any protrusions through the KERDI membrane (e.g., showerhead, mixing
valve, etc.) must be treated with Schluter
®
-KERDI-SEAL-PS and
Schluter
®
-KERDI-SEAL-MV seals, Schluter
®
-KERDI-FIX, or equivalent
sealant.
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-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 A118.3, 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.
Showers - Ceramic or stone tile
K-SH-M-12
Mortar base