Installation Guide

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Schluter

-KERDI waterproofing membrane or

Schluter

-KERDI-BOARD waterproof building panel

STEAM SHOWER ASSEMBLY — Schluter

-KERDI waterproofing membrane 17

Intermittent Use Steam Showers – Ceramic or stone tile

K-SSH-20

Areas of Application

Interior intermittent use steam showers (e.g., residential applications).

Over wood or concrete subfloors. See the Base information under

Requirements (below) for details.

Areas requiring disabled access/curbless applications; see detail K-SHBF

on page 12.

Limitations

Not intended for continuous use steam rooms (e.g., applications in spas,

fitness centers, etc.); see detail K-SR on page 18.

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.

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.

Base – KERDI-SHOWER-T/-TS/-TT/-LT/-LTS or Portland cement mortar

bed

Curb – KERDI-BOARD-SC, KERDI-BOARD, concrete, masonry block, or

sawn lumber sheathed with solid backing (see below).

Bench – KERDI-BOARD-SB, KERDI-BOARD, concrete, masonry block,

or sawn lumber sheathed with solid backing (see below).

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.

KERDI-DRAIN/-LINE shall be properly supported.

KERDI-DRAIN/-LINE shall be connected to the waste line; use ABS

cement for ABS drains, PVC cement for PVC drains, a no-hub coupling

for stainless steel drains with no-hub outlets, and thread sealing

compound or tape for stainless steel drains with threaded outlets.

Slope ceilings 2" (50 mm) per foot minimum to avoid condensation from

dripping onto occupants (may be sloped to center to minimize rundown

on walls).

Install KERDI waterproofing membrane on base and curb and

KERDI-BOARD waterproof building panel or KERDI waterproofing

membrane on walls and ceiling. For enclosed areas, also install on door

jambs, door header and past the door frame gasket, as applicable.

Minimum KERDI-BOARD thickness – 1/2" (12.5 mm) for studs spaced at

16" (40.6 cm) o.c. and 3/4" (19 mm) for studs spaced at 24" (61.0 cm) o.c.

KERDI-BOARD shall be fastened to wood or metal framing with

appropriate screws (i.e., coarse thread wood screw for wood studs and

self-tapping for metal studs) and corresponding KERDI-BOARD-ZT

washers. Screws must reach a depth of at least 3/4" (20 mm) in wood

studs and 3/8" (10 mm) in metal studs. Maximum allowable on-center

fastener spacing is 12" (30 cm) for walls and 6" (15 cm) for ceilings.

It is the specifier's responsibility to treat and address all penetrations

through the KERDI membrane or KERDI-BOARD (e.g., showerhead,

mixing valve, steam inlet, lights, etc.) in the installation. All penetrations

must be treated with KERDI-SEAL-PS/-MV seals, room temperature

vulcanizing sealant or other suitable sealant with a working temperature

over 250 - 300 °F (120 - 150 °C).

When using the stainless steel KERDI-DRAIN bonding flange, use

KERDI-FIX to bond KERDI to the integrated bonding flange.

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., DILEX-EKE) provide a

maintenance-free alternative to sealant; see page 40.

All horizontal surfaces (e.g., benches, curbs, window sills, shelves, etc.)

must be sloped toward the shower drain. This can be done by sloping

the substrate or the tile.

Substrate Preparation

Verify that subfloor panels are properly fastened to framing members.

Any leveling of the subfloor must be done prior to installing

KERDI-SHOWER-T/-TS/-TT/-LT/-LTS/-SR and KERDI-BOARD-SC/-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 directions

Portland cement mortar bed – ANSI A108.1B

Tile – ANSI A108.5

Grout – ANSI A108.6, A108.10

Other Considerations

When KERDI-SHOWER-T/-TS/-TT/-LT/-LTS tray dimensions do not

match the dimensions of the shower compartment, the tray may be cut

or extended with dry pack mortar.

Shower grab bars must be anchored in the structure or solid blocking

behind KERDI-BOARD.

When 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 and

grouting materials. When KERDI-BOARD and tile are installed on the

ceiling, the fasteners must be able to support the load of the tile and

setting and grouting materials.

A water test is strongly recommended before setting tile to verify a

successful installation. Wait 24 hours minimum after the membrane

installation is complete to allow for final set of thin-set mortar and ensure

waterproof performance at seams and connections. Refer to local

plumbing codes for any specific requirements in your area.

Schluter

-Systems profiles may be used to finish and protect outside

corners and eliminate the use of sealant at inside corners; see page 40.

Schluter

-SHOWERPROFILE-S/-R profiles eliminate the need for cutting

wedges of tile by covering the exposed wall area where the floor slopes

to KERDI-LINE.]

Schluter

-SHELF-E/-W/-N are alternatives to tiled shelves that can be easily

installed on walls and in corners and niches; see page 40.

Where a waterproof floor adjacent to the shower is desired, DITRA or

DITRA-HEAT uncoupling membranes shall be installed. Floor/wall

connections shall be sealed with KERDI-BAND.