Specification

Prefabricated Shower Substrates
Schluter
®
prefabricated shower substrates
provide an alternative to shower bases
constructed of mortar and other shower
elements constructed of framing and solid
backing. The shower tray, curb, ramp,
bench, and niche are especially useful in
large-scale, repetitive jobs, such as hotels,
apartments, and condominiums for the
significant time savings that can be realized.
Application and Function
8.3 Schluter
®
-KERDI-SHOWER-ST/-
SC/-SR/-SB are prefabricated substrates,
made of expanded polystyrene foam, for use
in conjunction with the KERDI waterproofing
membrane. The KERDI-SHOWER-ST
sloped shower tray is specifically designed
to accept the KERDI-DRAIN and is available
in 48" x 48" (122 x 122 cm), 32" x 60" (81 x
152 cm), and 72" x 72" (183 x 183 cm) sizes.
KERDI-SHOWER-SC is a prefabricated
curb that can be used in conjunction with
any shower base. Curb dimensions are
48" x 6" x 4-1/2" (122 x 15 x 11.5 cm).
KERDI-SHOWER-SR is a ramp designed to
facilitate the construction of access ramps
for tiled showers. Ramp dimensions are
48" x 15-7/8" x 1-1/2" (122 x 40 x 3.8 cm).
The KERDI-SHOWER-SB shower bench
is available in triangular and rectangular
configurations in the following sizes (width
x depth x height). The triangular bench is
16" x 16" x 20" (41 x 41 x 51 cm). The
rectangular benches are 32" x 11-1/2" x
20" (81 x 29 x 51 cm), 42" x 11-1/2" x 20"
(107 x 29 x 51 cm), 48" x 11-1/2" x 20" (122
x 29 x 51 cm), 32" x 16" x 20" (81 x 41 x
51 cm) and 48" x 16" x 20" (122 x 41 x
51 cm).
8.8 Schluter
®
-KERDI-SHOWER-L/-LS
are prefabricated expanded polystyrene
sloped trays with integrated KERDI
waterproofing specifically designed to
accept the KERDI-LINE linear drain. The
trays are available for wall (-LS) or center
(-L) drain placement and are available in 39"
x 39" (100 x 100 cm) and 55" x 55" (140 x
140 cm) sizes.
12.1 Schluter
®
-KERDI-BOARD-SN is
a prefabricated shower niche made of
KERDI-BOARD that can be installed in both
KERDI and KERDI-BOARD wall assemblies.
The shower niche features a 1/2" (12.5
mm) -thick by 2" (50 mm) -wide integrated
bonding flange and is available in 12" x 6"
(30 x 15 cm), 12" x 12" (30 x 30 cm), 12"
x 20" (30 x 51 cm), and 12" x 28" (30 x
71 cm) sizes.
Material Properties and
Areas of Application
SHOWER-ST/-SC/-SR/-SB/-L/-LS
prefabricated substrates are manufactured
using lightweight expanded polystyrene. The
products require no special disposal and can
be recycled. No CFCs or HCFCs are present
in either the products or in the manufacturing
process. The polystyrene foam has a density
of 2.75 lb/ft
3
(44 kg/m
3
) with a 48 psi (331 kPa)
compressive strength at 10% deformation. It
is serviceable in temperatures up to 175°F
(79 °C). The expanded polystyrene used
to manufacture KERDI-SHOWER-ST/-SC/
-SR/-SB is treated with a flame retarding
agent. Expanded polystyrene should not be
exposed to hydrocarbons, esters, amines,
and aldehydes. All will deteriorate foam.
Exposure to ultraviolet rays (sunlight) for
long periods of time will result in partial
degradation (dusting) at the surface.
Waterproofing Membrane
Since traditional shower pan liners are
placed below the mortar setting bed in
conventional assemblies, moisture is
allowed to saturate the mortar bed. This
can increase the risk of leakage, cause
efflorescence, and foster mold growth.
Bonded waterproof membranes, such as
KERDI, are set on top of the mortar bed
and protect it from becoming saturated,
thus eliminating the problems associated
with traditional systems.
Application and Function
8.1 Schluter
®
-KERDI is a pliable, sheet-
applied, bonded waterproof membrane and
vapor retarder with limited crack-bridging
capabilities. It is made of soft polyethylene,
which is covered on both sides with a special
fleece webbing to anchor the membrane in
the thin-set mortar. Tiles can be installed
directly on the KERDI membrane using
the thin-bed method. Other trowel-applied
covering materials, such as plaster, can also
be used. Schluter
®
-KERDI-DS is a bonded
waterproof membrane and vapor retarder
with very low water vapor permeance for
use in continuous use steam rooms and
similar applications.
Various KERDI waterproofing accessories
are available. KERDI-KERECK-F are
preformed inside and outside corners.
KERDI-KERS-B are preformed, seamless
corners for waterproofing 135° angles
between triangular shower benches and
walls or tops of curbs in neo-angle shower
applications.
SHOWER SYSTEM
2
8.1 Schluter
®
-KERDI
Method
Property
8.3 Schluter
®
-KERDI-SHOWER-ST/-SC/-SR/-SB
Density ASTM D3575 2.75 lb/ft
3
(44 Kg/m
3
)
Compressive Strength
1
ASTM D3575 & D1621 48 psi (331 kPa)
Linear Expansion ASTM D696 3.5 x 10
-5
/°F
Maximum Service Temperature - 175 °F (79 °C)
Value
1
Compressive strength measured at 10% deflection of foam
8.3 Schluter
®
-KERDI-SHOWER
-ST/-SC/-SR/-SB
8.8 Schluter
®
-KERDI-SHOWER-L/-LS
12.1 Schluter
®
-KERDI-BOARD-SN