Installation Guide

ManualsBrandsUnbranded ManualsBathKerdi-Drain 4 in. x 4 in. ABS Drain Kit in Stainless Steel

Shower walls may be made waterproof using KERDI/-KERDI-DS or KERDI-BOARD prior to construction of the shower base.

The waterproofing is carried to the height of the showerhead (at minimum). KERDI or KERDI-BOARD application on ceiling is optional for showers.

For continuous-use steam rooms, KERDI-DS is applied to walls and ceilings. For intermittent use steam showers, KERDI or KERDI-BOARD is applied to

walls and ceilings.

20 INSTALLATION — Walls and Ceilings

Walls and Ceilings

Please refer to Schluter

-Systems' installation videos in addition to reading the instructions below.

INSTALLATION

Clean any dust or other debris from the

surface of the solid backing. Dampen

particularly dry and porous substrates in

order to help prevent premature drying or

skinning of the thin-set mortar.

Apply unmodified thin-set mortar using a

1/4" x 3/16" (6 mm x 5 mm) V-notched

trowel or the KERDI-TROWEL. Embed

KERDI or KERDI-DS in the mortar and work

the membrane onto the entire surface to

ensure full coverage and remove air pockets.

Seams in the membrane are constructed

by overlapping the edges by 2" (50 mm) or

by abutting adjacent sheets and installing

KERDI-BAND, centered over the joint.

Any protrusions through the membrane

(e.g., mixing valve, shower head, etc.)

must be sealed with KERDI-SEAL-PS/-MV,

KERDI-FIX, or other suitable sealant.

Schluter

-KERDI or Schluter

-KERDI-DS over solid backing

Schluter

-KERDI-BOARD over wood or metal framing

The thin-set mortar used for bonding KERDI/-KERDI-DS to walls and ceilings must be appropriate for the substrate and must penetrate and engage the

membrane ﬂeece. For most substrates (e.g., gypsum board or CBU), an unmodiﬁed thin-set mortar is used. The mortar must be mixed to a fairly ﬂuid

consistency, but still able to hold a notch.

KERDI-BOARD can be mounted vertically

or horizontally on framing with appropriate

screws and corresponding KERDI-BOARD-ZT

washers. Minimum board thickness = 1/2"

(12.5 mm) for studs spaced at 16" (40.6 cm)

o.c.; 3/4" (19 mm) for studs spaced at 24"

(61.0 cm) o.c. Screws must reach a depth of

at least 3/4" (20 mm) in wood studs and at

least 3/8" (10 mm) in metal studs.

Abut panels over the center of the studs.

Screws may be placed between adjacent

panels such that the washers fasten both

panel edges. The maximum allowable

on-center fastener spacing is 12" (30 cm)

for walls and 6" (150 mm) for ceilings.

KERDI-BOARD joints, corners, and fastener

penetrations are sealed with KERDI-BAND

and KERDI-KERECK corners, ensuring

a minimum 2" (50 mm) overlap. Apply

unmodified thin-set mortar using a 1/4" x 3/16"

(6 mm x 5 mm) V-notched trowel or the

KERDI-TROWEL. Embed KERDI-BAND/-

KERECK in the mortar and work the

membrane onto the surface to ensure full

coverage and remove air pockets. Any

protrusions through the panel (e.g., mixing

valve, shower head, etc.) must be sealed with

KERDI-SEAL-PS/-MV, KERDI-FIX, or other

suitable sealant.

Grab bars, wall-mounted toilets, or other heavy objects must be anchored in the structure or solid blocking behind KERDI-BOARD. Installation instructions

for other applications of KERDI-BOARD (e.g. fully embedded or spot-bonded over solid backing) can be found in the 12.1 Schluter

-KERDI-BOARD technical

data sheet.

KERDI-SEAL-PS/-MV