Shower Installation Guide

BATHTUB SURROUND — Schluter
®
-KERDI 11
Areas of application
Interior bathtub surrounds
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 bathtub
surrounds or may require special setting materials. Consult stone
supplier and Schluter
®
-Systems for more information.
Requirements
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
Solid backing panels shall be spaced a minimum of 1/4" (6 mm) above
the lip of the tub.
Schluter
®
-KERDI waterproofing membrane shall be installed up to the
height of the showerhead at minimum.
Any protrusions through the KERDI membrane (e.g., tub spout,
showerhead, mixing valve, etc.) must be treated with Schluter
®
-KERDI-
SEAL-PS and Schluter
®
-KERDI-SEAL-MV seals, Schluter
®
-KERDI-FIX, or
equivalent sealant.
Substrate Preparation
Verify that solid backing is properly fastened to framing members.
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.
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.
Bathtub surround - Ceramic or stone tile
Schluter
®
-KERDI
K-TS-12