Use and Care Manual

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SHOWER ASSEMBLY — Schluter

-KERDI waterproofing membrane 7

Areas of Application

Interior showers.

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

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.

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

bed.

Curb – KERDI-BOARD-SC, KERDI-SHOWER-SC, KERDI-BOARD,

concrete, masonry block, or sawn lumber sheathed with solid backing

(see above).

Bench – KERDI-BOARD-SB, KERDI-SHOWER-SB, KERDI-BOARD,

concrete, masonry block, or sawn lumber sheathed with solid backing

(see above).

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.

KERDI waterproofing membrane shall be installed up to the height of the

showerhead at minimum.

In enclosed shower areas, install KERDI waterproofing membrane on all

surfaces, including the ceiling, door jambs and the door header.

Any protrusions through the KERDI membrane (e.g., showerhead, mixing

valve, etc.) must be treated with KERDI-SEAL-PS/-MV seals, KERDI-FIX

or suitable sealant.

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

KERDI-FIX to bond KERDI to the drain.

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 and solid backing are properly fastened to

framing members.

Any leveling of the subfloor must be done prior to installing

KERDI-SHOWER-T/-TS/-TT/-LT/-LTS/-SB/-SC/-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 instructions

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.

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.

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 37.

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.

Showers – Ceramic or stone tile

K-SH-K-19

Schluter

-KERDI waterproofing membrane