Installation Guide

12 WATERPROOFING — Floors, Interior
Every substrate presents unique challenges
WATERPROOFING
Floors, Interior - Ceramic or Stone Tile
DH-WP-20
Areas of Application
over any even and structurally sound
substrate where waterproofing is desired
Limitations
minimum 2" x 2" (50 mm x 50 mm) tile
Requirements
all seams in DITRA-HEAT and DITRA-HEAT-
DUO matting and floor/wall transitions must
be sealed with KERDI-BAND using Schluter
SET
®
, Schluter ALL-SET
®
, Schluter FAST-
SET
®
, or unmodified thin-set mortar.
Note: KERDI-BAND must lap DITRA-HEAT
at seams and at floor/wall transitions by a
minimum of 2" (50 mm) in order to maintain
waterproof integrity
Other Considerations
seaming DITRA-HEAT and DITRA-HEAT-DUO,
including floor/wall connections, with KERDI-
BAND may be appropriate in cases where a
break in the water line of an ice maker or
dishwasher can damage pre-existing moisture-
sensitive substrates and underlayments.
KERDI-BAND floor/wall connections are just as
easily concealed with wood base as with tile.
KERDI-BAND floor/wall connections in
dishwasher alcoves are parged with thin-set
mortar.
in some applications the vertical section of
the floor/wall transition will not accept a bond
to unmodified thin-set mortar. Connections
to such elements can be achieved using
KERDI-FIX or suitable trowel-applied
waterproofing materials, such as those that
require atmospheric moisture to cure (e.g.,
urethane sealant).
KERDI-DRAIN or KERDI-LINE may be used
to provide drainage in DITRA-HEAT and
DITRA-HEAT-DUO applications. DITRA-
HEAT and DITRA-HEAT-DUO are sealed to
the fleece-laminated KERDI-DRAIN bonding
flange with a section of KERDI membrane
using Schluter SET
®
, Schluter ALL-SET
®
,
Schluter FAST-SET
®
, or unmodified thin-set
mortar. KERDI-FIX is used to seal the section
of KERDI to the stainless steel KERDI-DRAIN
bonding flange. DITRA-HEAT and DITRA-
HEAT-DUO are sealed to the KERDI
waterproofing collar on KERDI-LINE using
Schluter SET
®
, Schluter ALL-SET
®
, Schluter
FAST-SET
®
, or unmodified thin-set mortar.
Today’s construction methods, which include the use of lightweight, moisture-sensitive materials, such as plywood, OSB, and gypsum
concrete, have made the installation of hard surface coverings particularly challenging. If wood or gypsum concrete substrates are exposed
to moisture, the tile covering above can be damaged as a result.
Typical areas that require waterproofing include tub surrounds and showers. However, there are other commonly tiled areas that may,
through unexpected circumstances, become exposed to significant amounts of water; for example, an overflowed toilet, or ruptured
dishwasher, icemaker, or washing machine lines, which can result in flooding.
Waterproofing these floors can save an owner from replacing the tile assembly and substructure in the event of a leak.
DITRA-HEAT and DITRA-HEAT-DUO installations can be made waterproof with minimal effort. Since the matting is made of waterproof
polypropylene, the only extra step necessary is to seal the seams and floor/wall connections. This is easily accomplished by applying
KERDI-BAND to these areas using Schluter SET
®
, Schluter ALL-SET
®
, Schluter FAST-SET
®
, or an unmodified thin-set mortar. The result is
a waterproof installation that will not suffer damage in the event of an unexpected water leak. KERDI-DRAIN or KERDI-LINE may be used
to provide drainage in DITRA-HEAT and DITRA-HEAT-DUO installations.
Tile or wood base
Ceramic, porcelain
or stone tile
RONDEC
DILEX-EKE
Schluter SET
®
,
Schluter ALL-SET
®
,
Schluter FAST-SET
®
,
or unmodified
thin-set mortar
KERDI-BAND
DITRA-HEAT
or DITRA-HEAT-DUO
uncoupling membrane
and heating cables
Thin-set mortar
per appropriate
detail