DITRA-HEAT Installation Handbook

DITRA-HEAT Installation Handbook
Schluter®-DITRA-HEAT Installation Handbook 2016
5,5 mm
Electric Floor Warming System
with Integrated Uncoupling Technology Schluter®-DITRA-HEAT
Electric Floor Warming System with Integrated Uncoupling Technology
Ceramic and stone tiles are the ideal surface coverings because they are durable, easy to maintain, and hygienic. However
two common barriers to the selection of tile as a floor covering are concerns about cracking and the perception that tiles
are cold.
Floor warming systems are a growing trend in tile applications, but none address concerns about cracking. A viable
installation system must address the magnified fluctuations in temperature that contribute to increased shear stresses
between the substrate and the tile covering. Schluter®-DITRA-HEAT integrates customizable, comfortable electric floor
warming with the functions associated with DITRA: uncoupling, waterproofing, vapor management and support to ensure a
long lasting installation.
DITRA-HEAT combines the flexibility of loose heating cables with the ease of installation of mat systems. Cables can be
placed wherever heat is desired, without creating height differences in the floor. Self-leveling compounds are not required
to encapsulate the cables, significantly reducing installation time and effort compared to uncoupling membranes over other
electric floor warming systems.
Uncoupling
Tile has been successfully installed for thousands of years by incorporating an uncoupling layer,
or forgiving shear interface, within the tile assembly. DITRA-HEAT provides uncoupling through
its geometric configuration, which allows for in-plane movement that effectively neutralizes the
differential movement stresses between the substrate and the tile, thus eliminating the major cause
of cracking and delaminating of the tiled surface.
Waterproofing
DITRA-HEAT provides reliable waterproofing. Its polypropylene composition protects the substrate
from moisture penetration, which is particularly important in today’s building environment where
most substrates are moisture sensitive.
Vapor Management
The free space on the underside of DITRA-HEAT provides a route for excess moisture and vapor
to escape from the substrate that could otherwise cause damage to the tile covering above.
Thus, DITRA-HEAT effectively manages moisture beneath the tile covering.
Support/Load Distribution
When placed on a solid foundation, columns or pillars can support tremendous loads. The
same physical principle applies to DITRA-HEAT installations. Column-like mortar structures are
formed in and between the studs on the surface of the matting. Loads are transferred from the
tile covering through these column-like mortar structures to the substrate. Since DITRA-HEAT is
virtually incompressible within the tile assembly, the advantages of uncoupling are achieved without
sacrificing point load distribution capabilities.
Legend
Essential
Significant
Helpful
Schluter®-Systems’ written installation instructions shall have
precedence over referenced industry standard guidelines and
installation procedures insofar as referenced information may contain
overlapping or conflicting requirements. Type, thickness, and format
of the ceramic or stone tile surface covering must be suitable for the
intended application.
CONTENTS
WOOD
CONCRETE
GYPSUM
WATERPROOFING
MOVEMENT JOINTS
WOOD UNDERLAYMENT
INSTALLATION
THIN-SET FACTS
TESTING & CERTIFICATIONS
DITRA-HEAT-TB
208 V APPLICATIONS
NATURAL STONE
PRODUCT & ORDERING INFO
HEATING CABLE TESTS LOG
WARRANTY
4
6
7
7
8
9
10
11
14
15
Floors,
Floors,
Floors,
Floors,
Interior
Interior
Interior
Interior
–
–
–
–
16, 19.2, & 24-inch o.c. joist spacing
Natural Stone Tile
Existing Vinyl
Structural Plank Subfloor
Floors, Interior – Ceramic or Stone Tile
Floors, Interior – Ceramic or Stone Tile
Floors, Interior – Ceramic or Stone Tile
Placement guidelines and descriptions
Installation guidelines
Installation instructions
21 Discussion of thin-set mortar types to be used with Schluter®-DITRA-HEAT
22 Products evaluation
24 Solution to improve floor warming response time
25 Discussion of heating cables in 208 V applications
26 Discussion of natural stone and
single-layer wood subfloors
27
30 31
Heating cables must be installed by a qualified person
in accordance with this handbook and with the National
Electric Code (USA) or Canadian Electric Code Part I (CAN)
as applicable. All electrical connections must be made by a
qualified electrician, according to the electrical and building
codes effective in your region.
WOOD
Every substrate presents unique challenges
All wood materials, including OSB, plywood, and framing members, are subject to expansion, contraction, bending, and deflection as a
result of changes in moisture content and loading. Further, these deformations fluctuate over the life of the building structure.
DITRA-HEAT’s uncoupling function protects the ceramic or stone tile covering from the aforementioned deformations by
neutralizing the differential movement stresses between the wood structure and the tile, thus eliminating the major cause
of cracking and delaminating of the tiled surface. Therefore, DITRA-HEAT can replace a second layer of plywood in most
applications.
Since wood structures are sensitive to moisture, DITRA-HEAT’s waterproofing function adds an essential element to the
flooring assembly by providing simple, effective, and permanent moisture protection.
Wood continually absorbs and releases moisture. The free space beneath the DITRA-HEAT membrane allows the wood to
breathe and provides a route for any residual moisture in the wood substrate to escape.
Since DITRA-HEAT is virtually incompressible within the tile assembly, the advantages of uncoupling are achieved without
sacrificing point load distribution capabilities.
By addressing all of the challenges associated with today’s fast, lightweight construction methods, DITRA-HEAT provides a durable
installation system for ceramic and stone tile over wood substrates.
DITRA-HEAT combines the flexibility of loose heating cables with the ease of installation of mat systems. Cables can be placed wherever
heat is desired, without creating height differences in the floor. Self-leveling compounds are not required to encapsulate the cables,
significantly reducing installation time and effort compared to uncoupling membranes over other electric floor warming systems.
Floors, Interior - Ceramic or Porcelain Tile
DH-W16-T-16
Ceramic or porcelain tile
Unmodified thin-set mortar
DITRA-HEAT
or DITRA-HEAT-TB
uncoupling membrane
and heating cables
Latex p.c. mortar
Single layer of plywood
or OSB
Joists, I-joists, or
trusses
16" (406 mm) o.c. joist spacing, single layer OSB
or plywood subfloor
Areas of Application
over any even and structurally sound OSB or
plywood subfloor with 16" (406 mm) o.c. joist
spacing
interior dry or wet areas
Setting and Grouting Materials
latex portland cement (p.c.) mortar –
ANSI A118.11
unmodified thin-set mortar – ANSI A118.1
grout – ANSI A118.3, A118.6, A118.7, A118.8
Limitations
minimum 2" x 2" (50 mm x 50 mm) tile
for natural stone, see detail DH-W-S (page 6)
and natural stone discussion (page 26)
Setting and Grouting Specifications
tile – ANSI A108.5
grout – ANSI A108.6, A108.9, A108.10
Requirements
maximum spacing of joists, I-joists, or floor
trusses is 16" (406 mm) o.c.
minimum subfloor thickness – 19/32", 5/8"
nom. (16 mm) tongue-and-groove with 1/8"
(3 mm) gap between sheets.
Substrate Preparation
verify that subfloor panels are properly
fastened to framing members.
any leveling of the subfloor must be done
prior to installing DITRA-HEAT and DITRAHEAT-TB.
Movement Joints
DITRA-HEAT and DITRA-HEAT-TB do not
eliminate the need for movement joints,
including perimeter joints, within the tiled
surface. Movement joints must be installed in
accordance with industry standards and
norms; see page 11 of this Handbook, TCNA
EJ171, and TTMAC 301 MJ.
4
WOOD — Floors, Interior - Ceramic or Porcelain Tile
Other Considerations
tightly butted and/or tented plywood or OSB
seams must be addressed prior to installing
DITRA-HEAT and DITRA-HEAT-TB.
vapor barrier on crawl space floors according
to regional building codes.
where a waterproof floor is required, all
DITRA-HEAT and DITRA-HEAT-TB seams
and floor/wall transitions must be sealed with
KERDI-BAND using unmodified thin-set
mortar; see page 10. DH-W19-T-16
Ceramic or porcelain tile
Unmodified thin-set mortar
DITRA-HEAT
or DITRA-HEAT-TB
uncoupling membrane
and heating cables
Latex p.c. mortar
Single layer of plywood
or OSB
Joists, I-joists, or
trusses
19.2" (488 mm) o.c. joist spacing, single layer OSB
or plywood subfloor
Areas of Application
over any even and structurally sound OSB or
plywood subfloor with 19.2" (488 mm) o.c.
joist spacing
interior dry or wet areas
Limitations
minimum 2" x 2" (50 mm x 50 mm) tile
for natural stone, see detail DH-W-S (page 6)
and natural stone discussion (page 26)
Requirements
maximum spacing of joists, I-joists, or floor
trusses is 19.2" (488 mm) o.c.
minimum subfloor thickness – 23/32",
3/4" nom. (19 mm) tongue-and-groove with
1/8" (3 mm) gap between sheets.
Substrate Preparation
verify that subfloor panels are properly
fastened to framing members.
any leveling of the subfloor must be done
prior to installing DITRA-HEAT and DITRAHEAT-TB.
DH-W24-T-16
Ceramic or porcelain tile
Movement Joints
DITRA-HEAT and DITRA-HEAT-TB do not
eliminate the need for movement joints,
including perimeter joints, within the tiled
surface. Movement joints must be installed in
accordance with industry standards and
norms; see page 11 of this Handbook, TCNA
EJ171, and TTMAC 301 MJ.
Setting and Grouting Materials
latex portland cement (p.c.) mortar –
ANSI A118.11
unmodified thin-set mortar – ANSI A118.1
grout – ANSI A118.3, A118.6, A118.7, A118.8
Setting and Grouting Specifications
tile – ANSI A108.5
grout – ANSI A108.6, A108.9, A108.10
Other Considerations
tightly butted and/or tented plywood or OSB
seams must be addressed prior to installing
DITRA-HEAT and DITRA-HEAT-TB.
vapor barrier on crawl space floors according
to regional building codes.
where a waterproof floor is required, all
DITRA-HEAT and DITRA-HEAT-TB seams
and floor/wall transitions must be sealed with
KERDI-BAND using unmodified thin-set
mortar; see page 10.
24" (610 mm) o.c. joist spacing, double layer OSB
or plywood subfloor
Unmodified thin-set mortar
DITRA-HEAT
or DITRA-HEAT-TB
uncoupling membrane
and heating cables
Latex p.c. mortar
Double layer of plywood
or OSB
I-joists or
trusses
Areas of Application
over any even and structurally sound double
layer OSB or plywood floor
interior dry or wet areas
Limitations
minimum 2" x 2" (50 mm x 50 mm) tile
Requirements
maximum spacing of joists, I-joists, or floor
trusses is 24" (610 mm) o.c.
double layer wood floor consisting of:
• minimum subfloor thickness – 23/32",
3/4" nom. (19 mm) tongue-and-groove
• minimum underlayment thickness –
11/32", 3/8" nom. (10 mm)
Substrate preparation
verify that subfloor panels are properly
fastened to framing members.
underlayment – minimum 11/32", 3/8" nom.
(10 mm)-thick Exposure 1, plugged-face
plywood or OSB with 1/8" (3 mm) gap
between sheets; see page 14 for
underlayment installation guidelines.
any leveling of the subfloor must be done
prior to installing DITRA-HEAT and DITRAHEAT-TB.
Movement Joints
DITRA-HEAT and DITRA-HEAT-TB do not
eliminate the need for movement joints,
including perimeter joints, within the tiled
surface. Movement joints must be installed in
accordance with industry standards and
norms; see page 11 of this Handbook, TCNA
EJ171, and TTMAC 301 MJ.
Setting and Grouting Materials
latex portland cement (p.c.) mortar –
ANSI A118.11
unmodified thin-set mortar – ANSI A118.1
grout – ANSI A118.3, A118.6, A118.7, A118.8
Setting and Grouting Specifications
tile – ANSI A108.5
grout – ANSI A108.6, A108.9, A108.10
Other Considerations
tightly butted and/or tented plywood or OSB
seams must be addressed prior to installing
DITRA-HEAT and DITRA-HEAT-TB.
vapor barrier on crawl space floors according
to regional building codes.
where a waterproof floor is required, all
DITRA-HEAT and DITRA-HEAT-TB seams
and floor/wall transitions must be sealed with
KERDI-BAND using unmodified thin-set
mortar; see page 10.
WOOD — Floors, Interior - Ceramic or Porcelain Tile
5
Floors, Interior - Natural Stone Tile
DH-W-S-16
Natural stone tile
Unmodified thin-set mortar
DITRA-HEAT
or DITRA-HEAT-TB
uncoupling membrane
and heating cables
Latex p.c. mortar
Double layer of plywood
or OSB
Joists, I-joists, or
trusses
Double layer of OSB or Plywood subfloor
Areas of Application
over any even and structurally sound double
layer OSB or plywood floor
interior dry or wet areas
Limitations
requires double layer wood floor regardless
of joist spacing
minimum 2" x 2" (50 mm x 50 mm) tile
Requirements
maximum spacing of joists, I-joists, or floor
trusses is 24" (610 mm) o.c.
double layer wood floor consisting of:
• minimum subfloor thickness – 23/32",
3/4" nom. (19 mm) tongue-and-groove
• minimum underlayment thickness –
11/32", 3/8" nom. (10 mm)
Substrate Preparation
verify that subfloor panels are properly
fastened to framing members.
underlayment – minimum 11/32", 3/8" nom.
(10 mm)-thick Exposure 1, plugged-face
plywood or OSB with 1/8" (3 mm) gap
between sheets; see page 14 for
underlayment installation guidelines.
any leveling of the subfloor must be done
prior to installing DITRA-HEAT and DITRAHEAT-TB.
6
WOOD — Floors, Interior
Movement Joints
DITRA-HEAT and DITRA-HEAT-TB do not
eliminate the need for movement joints,
including perimeter joints, within the tiled
surface. Movement joints must be installed in
accordance with industry standards and
norms; see page 11 of this Handbook, TCNA
EJ171, and TTMAC 301 MJ.
Setting and Grouting Materials
latex portland cement (p.c.) mortar –
ANSI A118.11
unmodified thin-set mortar – ANSI A118.1
grout – ANSI A118.3, A118.6, A118.7, A118.8
Setting and Grouting Specifications
tile – ANSI A108.5
grout – ANSI A108.6, A108.9, A108.10
Other Considerations
certain moisture-sensitive stones, e.g., green
marble, or resin-backed tiles may require
special setting materials. Consult stone
supplier and Schluter®-Systems for more
information.
tightly butted and/or tented plywood or OSB
seams must be addressed prior to installing
DITRA-HEAT and DITRA-HEAT-TB.
vapor barrier on crawl space floors according
to regional building codes.
where a waterproof floor is required, all
DITRA-HEAT and DITRA-HEAT-TB seams
and floor/wall transitions must be sealed with
KERDI-BAND using unmodified thin-set
mortar; see page 10.
Floors, Interior - Existing Vinyl Floors
DH-V-T-16
Tile or wood base
Ceramic, porcelain
or stone tile
RONDEC
DILEX-EKE
Unmodified thin-set mortar
KERDI-BAND
DITRA-HEAT
or DITRA-HEAT-TB
uncoupling membrane
and heating cables
Fast-setting
latex p.c. mortar
Existing vinyl
Plywood or OSB
Joists, I-joists, or
trusses
Areas of Application
over any even and structurally sound substrate
with existing vinyl flooring
interior dry or wet areas
Limitations
minimum 2" x 2" (50 mm x 50 mm) tile
cushioned vinyl unacceptable
perimeter bonded vinyl flooring unacceptable
multiple layers of vinyl unacceptable
Requirements
for wood substrates, subfloor/underlayment
configuration according to detail DH-W16-T,
DH-W19-T, DH-W24-T, or DH-W-S
Substrate Preparation
ensure that the structure beneath the vinyl is
sound and adequate
ensure that vinyl is well adhered
remove any wax and clean vinyl
for wood substrates, nail off floor with ring
shank flooring nails every 4" (102 mm) o.c. –
fasteners must pass through entire thickness
of assembly with minimal penetration into
joists
any leveling of the subfloor must be done prior
to installing DITRA-HEAT and DITRA-HEATTB.
Movement Joints
DITRA-HEAT and DITRA-HEAT-TB do not
eliminate the need for movement joints,
including perimeter joints, within the tiled
surface. Movement joints must be installed in
accordance with industry standards and
norms; see page 11 of this Handbook, TCNA
EJ171, and TTMAC 301 MJ.
DH-SP-TS-16
Ceramic, porcelain
or stone tile
Unmodified thin-set mortar
DITRA-HEAT
or DITRA-HEAT-TB
uncoupling membrane
and heating cables
Latex p.c. mortar
Plywood or OSB
underlayment
Structural plank
subfloor
Joists
Setting and Grouting Materials
Fast-setting latex portland cement (p.c.)
mortar – ANSI A118.4 or A118.15
unmodified thin-set mortar – ANSI A118.1
grout – ANSI A118.3, A118.6, A118.7, A118.8
Setting and Grouting Specifications
tile – ANSI A108.5
grout – ANSI A108.6, A108.9, A108.10
Other Considerations
DITRA-HEAT and DITRA-HEAT-TB are adhered
to the vinyl flooring using a fast-setting latexportland cement mortar suitable for bonding to
vinyl. As an alternative, a suitable cementbased embossing leveler or an appropriate
latex-modified thin-set mortar can be used to
skim coat the vinyl to provide a bonding
surface. When skim coat is cured, DITRAHEAT and DITRA-HEAT-TB are adhered to the
skim coat using an unmodified thin-set mortar.
See page 21 for discussion on latex-modified
thin-set mortars sandwiched between two
impervious layers.
seaming DITRA-HEAT and DITRA-HEAT-TB,
including floor/wall connections, with KERDIBAND may be appropriate in cases where a
break in the water line of an ice maker or
dishwasher can damage pre-existing moisturesensitive 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; see page 10.
vapor barrier on crawl space floors according
to regional building codes.
certain moisture-sensitive stones, e.g., green
marble, or resin-backed tiles may require
special setting materials. Consult stone supplier
and Schluter®-Systems for more information.
Floors, Interior - Structural Plank Subfloor
Areas of Application
over structural plank subfloors
interior dry or wet areas
Limitations
minimum 2" x 2" (50 mm x 50 mm) tile
Requirements
maximum spacing of joists is 24" (610 mm) o.c.
double layer wood floor consisting of:
• minimum structural plank subfloor
thickness – 3/4" (19 mm)
• minimum underlayment thickness –
15/32", 1/2" nom. (13 mm)
Substrate Preparation
verify that subfloor planks are properly
fastened to framing members.
underlayment – minimum 15/32", 1/2" nom.
(13 mm)-thick Exposure 1, plugged-face
plywood or OSB with 1/8" (3 mm) gap
between sheets; see page 14 for
underlayment installation guidelines.
any leveling of the subfloor must be done
prior to installing DITRA-HEAT and DITRAHEAT-TB.
Movement Joints
DITRA-HEAT and DITRA-HEAT-TB do not
eliminate the need for movement joints,
including perimeter joints, within the tiled
surface. Movement joints must be installed in
accordance with industry standards and
norms; see page 11 of this Handbook, TCNA
EJ171, and TTMAC 301 MJ.
Setting and Grouting Materials
latex portland cement (p.c.) mortar –
ANSI A118.11
unmodified thin-set mortar – ANSI A118.1
grout – ANSI A118.3, A118.6, A118.7, A118.8
Setting and Grouting Specifications
tile – ANSI A108.5
grout – ANSI A108.6, A108.9, A108.10
Other Considerations
vapor barrier on crawl space floors according
to regional building codes.
where a waterproof floor is required, all
DITRA-HEAT and DITRA-HEAT-TB seams
and floor/wall transitions must be sealed with
KERDI-BAND using unmodified thin-set
mortar; see page 10.
certain moisture-sensitive stones, e.g., green
marble, or resin-backed tiles may require
special setting materials. Consult stone
supplier and Schluter®-Systems for more
information.
WOOD — Floors, Interior
7
CONCRETE
Every substrate presents unique challenges
There are various challenges associated with the installation of hard surface coverings on concrete substrates.To begin, the coefficient of thermal
expansion of concrete is close to twice that of ceramic tile. Additionally, tile contractors are often expected to install tile over young concrete
(concrete cured less than 28 days). However, rigid surface coverings installed over young concrete are susceptible to damage as a result of
shrinkage during curing. Pre-stressed/post-tensioned concrete slabs are also commonplace in today’s construction environment. Although prestressing is used to help control deflections in concrete structures, these slabs are still subject to deformations caused by changes in moisture,
temperature, and loading. Many concrete slabs on or below grade are subject to moisture migration, which can be problematic. Furthermore,
these structures experience the same deformations as stated above.
DITRA-HEAT’s uncoupling function protects the ceramic or stone tile covering by neutralizing the differential movement stresses
between the concrete substrate and the tile, thus eliminating the major cause of cracking and delaminating of the tiled surface.
DITRA-HEAT’s waterproofing ability not only protects the substrate from harmful substances, it also slows the drying of fresh
concrete, which reduces the chances of cracking and curling of the slab.
The configuration of the DITRA-HEAT matting provides free space to accommodate vapor emissions from the concrete slab.
This allows the installation of DITRA-HEAT and the tile covering as soon as the slab can be walked upon. Vapor management is
also essential for slabs subject to moisture migration.
Since DITRA-HEAT is virtually incompressible within the tile assembly, the advantages of uncoupling are achieved without
sacrificing point load distribution capabilities.
By addressing all of the challenges associated with today’s fast construction methods, DITRA-HEAT provides a durable installation system for
ceramic and stone tile over concrete substrates.
DITRA-HEAT combines the flexibility of loose heating cables with the ease of installation of mat systems. Cables can be placed wherever heat is
desired, without creating height differences in the floor. Self-leveling compounds are not required to encapsulate the cables, significantly reducing
installation time and effort compared to uncoupling membranes over other electric floor warming systems. DITRA-HEAT-TB features an integrated
thermal break to reduce heat loss to concrete substrates and improve floor warming response times.
Floors, Interior - Ceramic or Stone Tile
DH-C-TS-16
Ceramic, porcelain
or stone tile
Unmodified thin-set mortar
DITRA-HEAT
or DITRA-HEAT-TB
uncoupling membrane
and heating cables
Unmodified
thin-set mortar
Concrete
Concrete subfloor
Areas of Application
over any structurally sound and even concrete
subfloor
young concrete (concrete cured less than 28 days)
on or below grade concrete subject to moisture
migration
post-tensioned or pre-stressed concrete
cracked concrete
Limitations
minimum 2" x 2" (50 mm x 50 mm) tile
concrete slabs subject to moisture migration
must have all seams in DITRA-HEAT and
DITRA-HEAT-TB sealed with KERDI-BAND
using unmodified thin-set mortar
any cracks in concrete subfloor must exhibit
in-plane movement only; thin-set tile assemblies,
including those incorporating DITRA-HEAT or
DITRA-HEAT-TB, cannot accommodate
differential vertical displacement
Requirements
slab to be structurally sound
slab to be free of waxy or oily films and curing
compounds (when present, mechanical
scarifying is necessary)
the installation of DITRA-HEAT or DITRA-HEATTB and tile can begin as soon as the slab can be
walked upon
slab to be free of standing water
8
CONCRETE — Floors, Interior - Ceramic or Stone Tile
Substrate Preparation
any leveling of the subfloor must be done prior
to installing DITRA-HEAT and DITRA-HEAT-TB
Movement Joints
DITRA-HEAT and DITRA-HEAT-TB do not
eliminate the need for movement joints, including
perimeter joints, within the tiled surface. Movement
joints must be installed in accordance with industry
standards and norms; see page 11 of this
Handbook, TCNA EJ171, and TTMAC 301 MJ
Setting and Grouting Materials
unmodified thin-set mortar – ANSI A118.1
grout – ANSI A118.3, A118.6, A118.7, A118.8
Setting and Grouting Specifications
tile – ANSI A108.5
grout – ANSI A108.6, A108.9, A108.10
Other Considerations
where a waterproof floor is required, all
DITRA-HEAT and DITRA-HEAT-TB seams and
floor/wall transitions must be sealed with KERDIBAND using unmodified thin-set mortar; see page
10
certain moisture-sensitive stones, e.g., green
marble, or resin-backed tiles may require special
setting materials. Consult stone supplier and
Schluter®-Systems for more information
Consider the use of DITRA-HEAT-TB to improve
the response time of DITRA-HEAT in applications
over concrete. See page 24 for more information.
GYPSUM
Every substrate presents unique challenges
Bonding ceramic or stone tiles directly to gypsum concrete substrates is generally considered questionable or not recommended. The
challenges associated with gypsum-based underlayments include the requirement of an extended drying period before installing tile and
continued sensitivity to the reintroduction of moisture throughout the life of the installation. In addition, since the coefficient of thermal
expansion of gypsum concrete is substantially greater than that of ceramic tile, shear stresses caused by temperature fluctuations can
result in delamination or cracking of the tile covering. This is particularly important when gypsum concrete is used as a thermal mass for
radiant heated floors. With the increasing popularity of radiant heated floors, which typically utilize gypsum concrete, tile installers need a
reliable installation system to address these issues.
DITRA-HEAT’s uncoupling function protects the ceramic or stone tile covering by neutralizing the differential movement
stresses between the gypsum concrete substrate and the tile, thus eliminating the major cause of cracking and delaminating
of the tiled surface.
DITRA-HEAT’s waterproofing function prevents the reintroduction of moisture to gypsum concrete underlayments, which,
if not prevented, could significantly compromise performance of the underlayment and lead to damage of the tiled surface.
The configuration of the DITRA-HEAT matting provides free space to accommodate vapor emissions from the gypsum.
Since DITRA-HEAT is virtually incompressible within the tile assembly, the advantages of uncoupling are achieved without
sacrificing point load distribution capabilities.
By addressing all of the challenges associated with today’s fast, lightweight construction methods, DITRA-HEAT provides a durable
installation system for ceramic and stone tile over gypsum substrates.
DITRA-HEAT combines the flexibility of loose heating cables with the ease of installation of mat systems. Cables can be placed
wherever heat is desired, without creating height differences in the floor. Self-leveling compounds are not required to encapsulate the
cables, significantly reducing installation time and effort compared to uncoupling membranes over other electric floor warming systems.
DITRA-HEAT is useful even in applications where hydronic radiant-heating tubes are incorporated in gypsum concrete, as there may be
times when floor warming is desirable while radiant heating is not necessary.
Floors, Interior - Ceramic or Stone Tile
DH-G-TS-16
Gypsum concrete
Ceramic, porcelain
or stone tile
Areas of Application
over gypsum concrete underlayment placed
over structurally sound wood or concrete
subfloors
interior dry or wet areas
Unmodified thin-set mortar
DITRA-HEAT
or DITRA-HEAT-TB
uncoupling membrane
and heating cables
Unmodified
thin-set mortar
Gypsum
concrete
Limitations
minimum 2" x 2" (50 mm x 50 mm) tile
DITRA-HEAT-TB not recommended over
heated floors
Requirements
for wood substrates, subfloor/underlayment
configuration according to detail DH-W16-T,
DH-W19-T, or DH-W24-T.
where radiant heat tubes are laid over the
subfloor, gypsum poured to a height that is
3/4" (19 mm) above the tops of the tubes is
required before installing DITRA-HEAT and
DITRA-HEAT-TB.
residual moisture in gypsum screed, 2.0%
(percentage by volume) or less before installing
DITRA-HEAT and DITRA-HEAT-TB.
Substrate preparation
gypsum – follow manufacturer’s directions
Movement Joints
DITRA-HEAT and DITRA-HEAT-TB do not
eliminate the need for movement joints,
including perimeter joints, within the tiled
surface. Movement joints must be installed in
accordance with industry standards and
norms; see page 11 of this Handbook, TCNA
EJ171, and TTMAC 301 MJ.
Setting and Grouting Materials
unmodified thin-set mortar – ANSI A118.1
grout – ANSI A118.3, A118.6, A118.7, A118.8
Installation Specifications
gypsum – follow manufacturer’s directions
tile – ANSI A108.5
grout – ANSI A108.6, A108.9, A108.10
Other Considerations
since DITRA-HEAT and DITRA-HEAT-TB must
bond to the gypsum concrete, follow gypsum
manufacturer’s directions regarding primers
and/or special surface preparation before
installing DITRA-HEAT and DITRA-HEAT-TB.
where a waterproof floor is required, all
DITRA-HEAT and DITRA-HEAT-TB seams
and floor/wall transitions must be sealed with
KERDI-BAND using unmodified thin-set
mortar; see page 10.
certain moisture-sensitive stones, e.g., green
marble, or resin-backed tiles may require
special setting materials. Consult stone
supplier and Schluter®-Systems for more
information.
vapor barrier on crawl space floors according
to regional building codes.
GYPSUM — Floors, Interior - Ceramic or Stone Tile
9
WATERPROOFING
Every substrate presents unique challenges
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-TB 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 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-TB
installations.
Floors, Interior - Ceramic or Stone Tile
DH-WP-16
Tile or wood base
Ceramic, porcelain
or stone tile
RONDEC
DILEX-EKE
Unmodified thin-set mortar
KERDI-BAND
DITRA-HEAT
or DITRA-HEAT-TB
uncoupling membrane
and heating cables
Thin-set mortar
per appropriate
detail
10
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-HEATTB matting and floor/wall transitions must be
sealed with KERDI-BAND using 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
WATERPROOFING — Floors, Interior
Other Considerations
seaming DITRA-HEAT and DITRA-HEAT-TB,
including floor/wall connections, with KERDIBAND may be appropriate in cases where a
break in the water line of an ice maker or
dishwasher can damage pre-existing moisturesensitive 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-TB applications. DITRA-HEAT/
DITRA-HEAT-TB is sealed to the fleecelaminated KERDI-DRAIN bonding flange with
a section of KERDI membrane using
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-TB is sealed
to the KERDI waterproofing collar on KERDILINE using unmodified thin-set mortar.
MOVEMENT JOINTS
Every substrate presents unique challenges
DISCUSSION
Movement joints are an integral part of any tile assembly. The various components of a tile
assembly (tile, mortar, substrate, etc.) have unique physical characteristics that affect
their behavior. Specifically, these components will expand and contract at different
rates, according to each component’s intrinsic physical properties, with changes
in moisture, temperature, and loading (both dead and live loads). This differential
expansion/contraction of attached components results in internal stresses.
Furthermore, structures that restrain overall expansion of the tile field (walls, columns,
etc.) cause stress buildup within the system. If the aforementioned movements
are not accommodated through the use of movement joints in the tile field and at
restraining structures, the resulting stresses can cause cracking of the grout and tile
and delamination of the tile from the substrate. Thus, movement joints are an essential
component of any durable tile assembly.
SOLUTIONS
Movement joints must be incorporated within the tile field, at doorsills, and at transitions
to walls and other restraining structures to allow movement of the assembly and prevent
stresses that can damage the system. Schluter®-Systems’ prefabricated movement joint
profiles protect tile edges and prevent sound bridges and surface water penetration,
resulting in a permanent, maintenance-free installation. The family of Schluter®-DILEX
prefabricated movement profiles includes a variety of shapes, sizes, and materials to suit
different applications. Please see Schluter®-Systems’ Illustrated Price List and visit www.
schluter.com for more detailed information on DILEX movement profiles.
TECHNICAL NOTES
The Tile Council of North America (TCNA) and the Terrazzo, Tile, and Marble
Association of Canada (TTMAC) provide guidelines (EJ171 and 301MJ, respectively)
for the placement and construction of movement joints in and around the tile field.
Schluter®-Systems accepts these guidelines. However, given the increased use of larger
tiles, smaller grout joints, and lighter building materials, which are more susceptible to
movement, Schluter®-Systems recommends that movement joints within the tile field be
placed at more frequent intervals, as indicated below.
Guidelines for the placement of movement joints
Applications without heating cables: 16' - 20' (4.9 m - 6.1 m) in each direction
Applications with heating cables or exposed to direct sunlight or moisture:
12' - 16' (3.7 m - 4.9 m) in each direction
Place around the perimeter of any size floor and/or against all restraining surfaces
Fields should be as square as possible. The ratio between length and width should
not exceed 1:1.5.
MOVEMENT JOINTS
11
Typical movement joint applications
1 Schluter®-DILEX-EKE
Perimeter Joints
Perimeter joints are provided at the outer edges of any tile installation to accommodate
movements attributable to changes in moisture, temperature, and loading. See figures
1, 2, and 3.
If Schluter®-DILEX corner movement profiles will not be used, Schluter®-Systems
recommends the use of sill seal (a compressible polyethylene gasket used to seal the
gap between foundations and sill plates) as a quality control measure when providing
perimeter movement joints. The sill seal band is placed against perimeter structures
before any component of the tile assembly is installed, (e.g., DITRA-HEAT, DITRA-HEATTB, additional underlayments including self-leveling materials, mortar beds, etc. See
figures 2 and 3). After the tile is installed and grouted, any excess sill seal material is cut
away, leaving a movement joint with uniform width that is void of any mortar, grout, or
other restraining materials that would render the joint ineffectual.
2 SILL SEAL BAND
Surface Joints
Surface joints must be placed within the tiled surface regardless of substrate conditions.
They provide for stress relief from movements in the tile field due to thermal and moisture
expansion/contraction and loading. See figure 4.
3 PERIMETER JOINT
Expansion Joints
Drywall
1/4-inch expansion
joint constructed with
sill seal band
Tile
Sealant
Thin-set
mortar
DITRA-HEAT
Subfloor
4 Schluter®-DILEX-BWS
Expansion joints permit both horizontal and vertical differential movements attributable
to thermal and moisture expansion/contraction by providing a complete separation
for the full depth of the slab to allow for free movement between adjoining parts of a
structure or abutting surfaces. They are typically placed at columns, walls, and any other
restraining surfaces. Expansion joints must be continued through the tile covering. The
DITRA-HEAT and DITRA-HEAT-TB membranes are separated at expansion joints and
the joint is continued through the tile covering using DILEX movement joint profiles. The
DITRA-HEAT-E-HK heating cables must not cross expansion joints. When DITRA-HEAT
and DITRA-HEAT-TB are used as waterproofing, the abutted sections must be covered
with KERDI-FLEX or KERDI-BAND.
Cold Joints
Cold (construction) joints occur where two successive placements of concrete meet.
True cold joints bond the new concrete to the old and do not allow movement. However,
it takes extra care to accomplish this, so they are usually designed to act as expansion
or control/contraction joints. Cold joints are treated in the same manner as expansion
joints. See above.
Control/Contraction Joints
Control/contraction joints are designed to induce controlled cracking caused by drying
and chemical shrinkage at preselected locations. They are typically formed by saw
cutting, tooling, or through the use of inserts. DITRA-HEAT and DITRA-HEAT-TB are
not separated at control/contraction joints; however, surface movement joints must be
provided in the tile covering in accordance with the aforementioned guidelines. See
also Surface Joints.
Structural or Seismic Joints
Regarding structural and seismic expansion joints, please contact Schluter®-Systems at
1-800-472-4588 (USA) or 1-800-667-8746 (Canada) for proper installation guidelines.
12
MOVEMENT JOINTS
Note regarding residential applications
Due to the increased popularity of continuous tile installations (i.e., tile continuing from room to room on a given floor), movement joints
have become both increasingly important and increasingly difficult to provide. For instance, consider the residential installation shown in
Figure 5. It is almost certain that the homeowner will resist the idea of placing movement joints across any of the rooms shown in the figure,
despite TCNA, TTMAC, and Schluter®-Systems guidelines. However, the need for movement joints in this installation is undeniable, given the
extended size of the field. The question then becomes, “How does one provide the movement joints necessary to ensure a durable installation
without compromising the aesthetic qualities of the continuous tile field?”
The easiest way to accomplish this goal is to begin by providing movement joints at the perimeter of the installation. Perimeter joints are
absolutely necessary and do not interrupt the tile field. The next step would be to place movement joints at the thresholds between rooms or
where a tiled hallway meets a larger tiled room. These locations are relatively inconspicuous and the lines formed by the movement joints are
logical in that they reflect the natural perimeter of each room. Finally, determine if any other characteristics of the floor plan invite the placement
of additional movement joints. In this example, the intersection of the nook area and kitchen/family room may be a reasonable choice.
Figure 5
Nook
Kitchen
Family
Room
Study/Office
Living/Dining
Room
Master
Suite
Schluter®-Systems understands that the tile setter must take into account the needs of his or her client in determining the placement
of movement joints in a tile installation. For example, a client may not wish to interrupt a continuous tile field that spans multiple rooms.
However, as indicated by the orange lines above, there are ways to meet industry guidelines that will serve to provide the client with a
durable installation that remains aesthetically pleasing.
MOVEMENT JOINTS
13
WOOD UNDERLAYMENT
Plywood/OSB underlayment installation guidelines
DISCUSSION
In some applications referenced in this Handbook, adding a layer of plywood or OSB before installing DITRA-HEAT and
the ceramic or stone tile covering is required to reduce deflection and curvature of the sheathing between the joists.
INSTALLATION GUIDE
Place underlayment panels (Exposure 1, plugged-face plywood or OSB) with long dimension perpendicular to floor joists
such that the following conditions are met:
1.Abut all underlayment end joints at quarter points between joists.
Example: Abut underlayment panels on either side of the joist centerline at: 4" (102 mm) for 16" (406 mm) o.c. joists,
5" (127 mm) for 19.2" (488 mm) o.c. joists, or 6" (152 mm) for 24" (610 mm) o.c. joists (see figures 1 & 2).
Note: Underlayment end joints should be placed as far away from subfloor end joints as possible.
2.Underlayment to overlap edge joints of subfloor by 1/2 of the width of the subfloor panel (24" - 610 mm). At restraining
surfaces, overlap may be less than 24" (610 mm) when the subfloor panel is less than 48" (1.2 m)-wide (see figure 1).
3.Gap underlayment panels 1/8" (3 mm) on all ends and edges, and 1/4" (6 mm) at perimeter walls, cabinetry, or other
restraining surfaces.
Figures 1 & 2 – Typical Subfloor/Underlayment Detail (Not to Scale)
Figure 1
Figure 2
Plywood/OSB Type and Fastener Schedule Guidelines
Plywood/OSB
Grades
Exposure 1,
plugged-face
plywood or OSB
Plywood/OSB
Thickness - in (mm)
Maximum On-Center Fastener Spacing - in (mm)
Panel Edges
Field
3/8 (10)
4 (102)
6 (152)
1/2 (13)
4 (102)
6 (152)
Greater than 1/2 (13)
6 (152)
6 (152)
The following guidelines must be followed when fastening underlayment panels:
1.Use ring shank nails (no staples) or wood screws (no drywall screws).
2.Fasteners must pass through entire thickness of underlayment and subfloor panels with minimal penetration into
joists (see figure 2).
FINAL WORD
As stated previously, Schluter®-Systems requires that any underlayment panel must have a minimum thickness of 3/8"
(10 mm). When in doubt, increase underlayment thickness.
14
WOOD UNDERLAYMENT
INSTALLATION
Schluter®-DITRA-HEAT membrane and heating cables
Planning
For access to the DITRA-HEAT Calculation Sheet and DITRA-HEAT Online Calculator, see www.schluter.com.
• Select DITRA-HEAT and DITRA-HEAT-TB membrane according to the size of the area to be tiled.
• Select DITRA-HEAT-E-HK heating cable according to the size of the area to be heated. Be sure to measure accurately. The heating cable CANNOT be cut to fit. The allowable
heated area is limited by the minimum required spacing from fixed elements such as:
• Walls = 3" (75 mm)
• Fixed cabinets = 2" (50 mm)
• Heat sources (baseboard heaters, fireplaces, forced air heating ducts, etc.) = 8" (200 mm)
• Floor drains = 6" (150 mm)
• It is helpful to plan the location of a buffer zone, as it is not possible to predict exactly where the heating cable will end. The buffer zone is an area where floor warming
is not essential and heating cable installation is not planned (e.g., behind a toilet or adjacent to a door opening). This area allows for placement of excess heating cable.
Heating cables may also be installed 6" (150 mm) from the wall to create a buffer zone.
• For more information on installing DITRA-HEAT-E-HK heating cables on 208 V circuits, please see page 25.
• Two DITRA-HEAT-E-HK heating cables can be connected and controlled by a single DITRA-HEAT-E-RT/-RSD/-R thermostat if the total current is less than 15 amps.
The heating cable leads must be wired in parallel according to applicable electrical and building codes.
• Multiple DITRA-HEAT-E-HK heating cables over 15 amps cannot be connected to a single DITRA-HEAT-E-RT/-RSD/-R thermostat. Additional DITRA-HEAT-E-RT/-RSD/-R
thermostats must be used or the DITRA-HEAT-E-RT thermostat may be combined with the DITRA-HEAT-E-RR power modules.
Preparation
• The substrate must be clean, even, and load bearing. Any leveling of the subfloor must be done prior to installing DITRA-HEAT and DITRA-HEAT-TB.
• For wood substrates, verify that panels are properly fastened. Tightly butted and/or tented plywood or OSB seams must be addressed prior to installing DITRA-HEAT and
DITRA-HEAT-TB. If a plywood/OSB underlayment is to be installed, follow the Wood Underlayment guidelines on page 14.
• For vinyl substrates, ensure that the structure beneath is sound and adequate and that the vinyl is well adhered. Remove any wax and clean the surface. For vinyl over wood
structures, nail off floor with ring shank flooring nails every 4" (102 mm) o.c. - fasteners must pass through entire thickness of assembly with minimal penetration into joists.
• For concrete substrates, remove any waxy or oily films and curing compounds (if present) by mechanical scarification. When bonding DITRA-HEAT and DITRA-HEAT-TB to
particularly dry, porous concrete, the slab should be moistened to saturate the concrete and help prevent premature drying or skinning of the bond coat. Excess or standing
surface water must be removed prior to installation.
• For gypsum substrates, residual moisture in gypsum screed must be 2.0% or less before installing DITRA-HEAT and DITRA-HEAT-TB. Follow gypsum manufacturer’s directions
for additional substrate preparation.
Membrane
1 Using a thin-set mortar that is suitable for
the substrate, apply the thin-set mortar
(mixed to a fairly fluid consistency, but still
able to hold a notch) using a 1/4" x 1/4"
(6 mm x 6 mm) square-notched trowel.
2
Apply DITRA-HEAT or DITRA-HEAT-TB to the
floor, fleece side down. Solidly embed the matting
into the mortar using a float, screed trowel, or
DITRA-ROLLER, making sure to observe the open
time of the bonding mortar. If the mortar skins over
prior to matting installation, remove and reapply.
Note: It may be helpful to back roll the end of the
matting before installation, or place boxes of tile on
top of the matting after installation, to avoid curling.
When using the DITRA-ROLLER, place a weight (e.g.,
bags of mortar/grout or box of tile) not to exceed 75
lbs on the DITRA-ROLLER shelf. Slowly move the
roller from one end of the matting to the other, slightly
overlapping successive passes.
ESTIMATED THIN-SET COVERAGE
To bond DITRA-HEAT to the substrate:
Use one 50 lb. (22.68 kg) bag of mortar per
100 ft2 (9.3 m2).
To bond the tile to the DITRA-HEAT, using a
1/4" x 3/8" (6 mm x 10 mm) square- or
U-notched trowel: Use one 50 lb (22.68 kg) bag
of mortar per 40 - 50 ft2 (3.7 - 4.6 m2).
3
Lift up a corner of the matting to check coverage.
Proper installation results in full contact between
the fleece webbing and the thin-set mortar. Note:
Coverage may vary with mortar consistency, angle
at which the trowel is held, substrate flatness, etc.
If full coverage is not achieved, remove and reapply,
making sure to verify proper mortar consistency and
application.
4 Abut end and side sections of adjacent sheets.
Note: Aligning the studs on the top of the matting
during installation can help make subsequent
heating cable installation easier.
To bond the tile to the DITRA-HEAT, using a 1/2"
x 1/2" (13 mm x 13 mm) square- or U-notched
trowel: Use one 50 lb (22.68 kg) bag of mortar
per 30 - 40 ft2 (2.8 - 3.7 m2).
INSTALLATION
15
Heating Cables
Warning
• Before installing and operating this product, the user and/or installer must read, understand and follow these instructions and keep them handy
for future reference. If you have a question, please contact Customer Service by phone 800-472-4588 (USA) or 800-667-8746 (Canada) or from
our website at www.schluter.com.
• If these instructions are not followed, the warranty will be considered null and void and the manufacturer deems no further responsibility for this
product.
• The following instructions must be adhered to in order to avoid personal injuries or property damages, serious injuries and potentially fatal electric
shocks.
• This product must be installed by a qualified person in accordance with this installation handbook and with the Canadian Electric Code Part I
(Canada) or the National Electric Code (U.S.) as applicable. All electric connections must be made by a qualified electrician, according to the
electrical and building codes effective in your region.
• A dedicated circuit is required for each application.
• A ground fault circuit interrupter (GFCI) is required for each circuit. The DITRA-HEAT-E-RT/-RSD/-R thermostats include a GFCI, thus a GFCI
circuit breaker is not required when using these thermostats.
• NEVER install a cable designed for a 120 V power source on a 240/208 V power source.
• This cable must be grounded. Connect the heating cable ground to the ground wire from the electrical panel.
• Mark the circuit breaker in the electrical panel that is dedicated to the DITRA-HEAT floor warming system using the identification sticker provided.
Additional stickers provided may be placed on the electrical panel door.
• De-energize all power circuits before installation and servicing.
• Very important: Never CUT or modify the heating cable in any way. This would change the cable resistance, will cause damage to the
cable, and could cause cable overheating.
• Heating cables shall not be altered in the field. If the installer or the user modifies the unit, he will be held responsible for any damage resulting
from this modification, and the warranty and the product certification will be void.
• The heating section of the cable must be entirely installed under the floor covering. The installation is characterized as a Type C (Embedded Floor
Warming) application. In order to prevent a fire hazard, do not install it anywhere else (e.g. in a wall).
• Do not run the heating cable under a wall, from one room to another; an individual cable must not heat more than one room.
• NEVER install the heating cable under vanities, bathtub platforms, kitchen cabinets or any other fixtures or in closets. Excessive heat will build
up in these confined spaces and may cause cable overheating.
• NEVER use the heating cable for any purpose other than heating a floor INSIDE a building.
• Always keep a 3 stud (3-1/2" – 9 cm) spacing between cable runs. A narrower spacing may cause a fire or damage the floor covering. A wider
spacing (e.g., 4 studs) may not provide sufficient power to warm the floor to the desired temperature. Exception: a two stud spacing is used
when connecting the 240 V cable to a 208 V power supply. See page 25 for more information.
• Heating cables may not touch, cross over, or overlap one another.
• Minimum spacing from walls is 3" (75 mm).
• Minimum spacing from fixed cabinets is 2" (50 mm).
• Minimum spacing from other heat sources (baseboard heaters, fireplaces, forced air heating ducts, etc.) is 8" (200 mm).
• Minimum spacing from any plumbing drain is 6" (150 mm).
• It is helpful to plan the location of a buffer zone, as it is not possible to predict where the heating cable will end. The buffer zone is an area where
heating is not essential and heating cable installation is not planned (e.g., behind a toilet or adjacent to a door opening). This area allows for
placement of excess heating cable. Heating cables may also be installed 6" (150 mm) from the wall to create a buffer zone.
• NEVER install the factory splice (i.e., black plastic junction between the cold lead and gray heating cable) in the wall. This will cause overheating,
system failure, and could cause a fire. This splice must be installed entirely under the floor covering, as shown in the heating cable installation
instructions.
• Heating cable testing is required while the heating cable is on the spool and at two subsequent steps during installation to ensure cable quality and for
warranty purposes.
• If a break or damage is detected during the heating cable testing, return the cable to the original place of purchase. Do not proceed with heating cable
installation into the DITRA-HEAT or DITRA-HEAT-TB matting or with the tile covering installation.
• NEVER energize the cable while it is on the spool. This would lead to overheating that could damage the cable and may cause a fire.
• Keep ends of heating devices and kit components dry before and during installation.
• The minimum temperature at which the cable should be installed is 32˚ F (0˚ C).
• Avoid folding the heating cable on itself, a radius of curvature less than 0.0625 inch (1.6 mm) could damage its sheath.
• The minimum installed bending radius of the heating cable is 0.5 inches (12.7 mm).
16
INSTALLATION
i
To avoid damaging the DITRA-HEAT-E-HK heating cable spool due to handling, we recommend turning the box over to
remove the spool from the packaging box. Then pick up the spool from underneath the heating cable coil, but not by the
cardboard washers.
Heating Cable Tests
To qualify for resolution for failure of the Schluter®-DITRA-HEAT-E-HK heating cables within the Schluter®-DITRA-HEAT &
Schluter®-DITRA-HEAT-TB Limited System Warranty for ten (10) years, complete the following tests:
• Test 1: Conductor Resistance
• Test 2: Conductor and Ground Braid Continuity
• Floor Temperature Sensor Test
(Test 3: Insulation Resistance is recommended, but not required)
To extend the term for resolution for failure of the Schluter®-DITRA-HEAT-E-HK heating cables within the Schluter®-DITRA-HEAT &
Schluter®-DITRA-HEAT-TB Limited System Warranty from ten (10) years to fifteen (15) years, complete all tests as follows:
•
•
•
•
Test 1: Conductor Resistance
Test 2: Conductor and Ground Braid Continuity
Test 3: Insulation Resistance
Floor Temperature Sensor Test
Please refer to the Heating Cable Tests Log on page 30 of this Handbook and Warranty on page 31 of this Handbook for further information.
Test 1: Conductor resistance (required)
In order to perform the resistance test, you must set your multimeter for resistance measurement
and take an ohms reading between the two power leads. If the ohms reading taken on the two
power leads varies significantly (10% or more) from the value printed on the spool, it either means
that the cable has been damaged, or that the measuring instrument is not set properly, or that it
is simply out of calibration. The ohms measurement must be recorded in your heating cable tests
log (page 30).
Test 2: Conductor and ground braid continuity (required)
The heating cable is protected by a ground braid. An electrical insulator prevents any contact
between the braid and the two conductors. To make sure there is no contact between the braid
and the two conductors, you must perform a continuity test. Using the continuity test (buzzer
logo) function of your multimeter, test your cable between the braid and one of the two power
leads. If there is no continuity (if the test is successful), the multimeter will display, depending on
the instrument used, either “OL ” for “over load” or “I” for “infinity”. Otherwise, if the test fails,
neither “OL ”, nor “I” will be displayed and a warning tone will be heard. The test result must be
recorded in your heating cable tests log (page 30).
Test 3: Insulation resistance (recommended)
This test is meant to detect very small breaks throughout the cable insulation. These breaks often
remain undetected during the continuity test since they are not necessarily short circuits between
the conductor and the ground braid. Even though they are small, these breaks are likely to cause
a current leakage to ground. Such a leakage is usually detected by the mandatory ground-fault
circuit interrupter “GFCI” (thermostat with integrated GFCI or panel mount GFCI). When a current
leakage is detected, the GFCI trips the circuit, thus disabling the floor heating system. In order
to perform the insulation resistance test, you must, using a megohmeter (Mohm logo), take an
insulation measurement between the braid and one of the two power leads. Make sure the
megohmeter range is set at 1000 V. The insulation resistance measurement must be equal to or
greater than 1 Gigaohms (1 Gigaohms = 1 G ohms = 1000 M ohms = 1000 Mega ohms). The
insulation resistance measurement must be recorded in your heating cable tests log (page 30).
DITRA-HEAT Thermostat Floor Temperature Sensor Test (required)
Test the floor temperature sensors using a multimeter to verify accuracy of the sensors. Set the
multimeter for resistance at 10K Ω +/- 2 (at room temperature) and take a reading between the
sensor leads. The resistance will vary according to the temperature (i.e., the colder the sensor, the
higher the resistance). Compare the measured values with the table of expected values and record
in the heating cable tests log on page 30.
INSTALLATION 17
Installation
Check to ensure the heating cable(s) purchased match the power supply (i.e., 120 V with 120 V or 240 V with 240 V, or 240 V with 208 V). Check to ensure you are
not exceeding the 15 amp limit of the thermostat. Compare the purchased cable area to the floor area to be heated. Important: The cable area purchased should be
as close to the heated area as possible, without going over. The heating cable CANNOT be trimmed or shortened to fit.
It is recommended that the installation of the DITRA-HEAT system is photographed (e.g., heating cable layout, floor temperature sensor placements, transition splice
location, end splice location, and wide view of the room) for reference with future renovation work and troubleshooting. The homeowner/end user should retain these
photos for their records.
1
Before the heating cable is removed from the
spool, conduct the first set of required tests and
record values in the heating cable tests log (page
30). If a break or damage is detected during the
tests, return the heating cable to the original place
of purchase.
2
Thread the heating cable cold lead through a conduit
(where required by code) from the base of the wall
to the thermostat electrical box. Floor temperature
sensors may not be threaded through the same
conduit as the cold lead.
4
Embed the heating cables between studs, at a
spacing of 3 studs (3-1/2" – 9 cm). Closer spacing
may result in overheating and damage to building
structures. A wider spacing (e.g., 4 studs) will not
provide sufficient power to warm the floor to the
desired temperature. Exception: a two-stud spacing
is used when connecting the 240 V cable to a 208
V power supply. See page 25 for more information.
5
Use care not to damage the cables during
installation, particularly before the cables are
embedded in the matting.
3
Mark where the cold/hot splice will be placed, cut
the DITRA-HEAT or DITRA-HEAT-TB matting, and
insert the splice. It may be necessary to temporarily
secure the splice to the floor with thin-set mortar or
adhesive (e.g., KERDI-FIX or hot glue).
Once the heating cable cold lead and remote
sensors are threaded to the thermostat electrical
box, install a metal protection plate at the base of
the wall. This will help prevent any damage from
fasteners (e.g., nails, screws, etc.) in the future.
The maximum allowable length of a single run is 10 ft (3 m);
the cable must be turned or a u-shaped "jog" created at
this point (see image above).
Notes:
• Make sure to leave space for inserting the floor temperature sensor(s).
• Heating cables may not touch, cross over, or overlap one another.
• Minimum spacing from:
• Walls is 3" (75 mm)
• Fixed cabinets is 2" (50 mm)
• Plumbing drains is 6" (150 mm)
• Other heat sources (baseboard heaters, fireplaces, forced air heating ducts, etc.) is 8" (200 mm)
6
Install the thermostat sensors evenly spaced between two cable runs, at a distance of at least 24" (610
mm) from the wall. Mark the sensor location on the DITRA-HEAT and cut the matting to recess the sensor.
It is recommended to temporarily remove the heating cable from the area while cutting the matting.
It may be necessary to temporarily secure the sensor to the floor with thin-set mortar or adhesive (e.g., KERDI-FIX or
hot glue). Embed the sensor wire in the matting without overlapping or crossing the heating cable.
7
Once the heating cable and floor temperature
sensor installation is complete, retest and record
values in the heating cable tests log (page 30).
Extending the heating cable cold lead
The cold lead is made up of two 14 AWG conductors with a copper braided shield, that is used as the grounding conductor. The extension must be made with building wire that is suitable
for this application and complies with applicable building and electrical codes. The cold lead itself is not made of building wire and therefore cannot pass through studs unless run through a
conduit. Extension of the cold lead requires the addition of a “code compliant” junction box that must be accessible at all times. The maximum length for extending the cold lead is 75 ft (23 m).
Extending the floor temperature sensor
The floor temperature sensor can be extended using an 18 AWG, 2-wire cable. The sensor wire itself is not made of building wire and therefore cannot pass through studs unless run through
a conduit. We recommend twisting and soldering the wires and using electrical tape to insulate them. There is no maximum length that is recommended, however the longer the extension the
greater the possibility that the quality of the signal (and resulting temperature sensing) will be skewed. Regardless of the method used, the resulting splice must comply with applicable building
and electrical codes. A loose connection between the extension and the sensor will result in a false reading or an error code.
18
INSTALLATION
Waterproofing
The following steps are required for waterproofing only:
Note: While the heating cable is protected by the DITRA-HEAT and DITRA-HEAT-TB matting, be careful when applying the mortar to not
damage the cable with the notched trowel.
1 At the joints, fill the matting with unmodified
thin-set mortar, approximately 8" (203 mm)
wide, centered over the joint.
4 At all wall junctions, apply KERDI-BAND as
described in steps 1-3, centered where the
wall and floor meet. 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
sealant and bonding compound or suitable
trowel-applied waterproofing materials, such
as those that require atmospheric moisture
to cure (e.g., urethane sealant).
2 Comb
additional unmodified thin-set
mortar over the joint using a 1/4" x 3/16"
(6 mm x 5 mm) V-notched trowel or the
KERDI-TROWEL, which features a 1/8" x 1/8"
(3 mm x 3 mm) square-notched design.
3 Apply 5" (127 mm)-wide KERDI-BAND,
centered over the joint. Using the flat side
of the trowel, firmly press the banding into
the mortar to ensure 100% coverage and to
remove excess mortar and air pockets.
Note: KERDI-BAND must lap DITRA-HEAT and DITRA-HEAT-TB at seams and at floor/wall
transitions by a minimum of 2" (50 mm) in order to maintain waterproof integrity.
INSTALLATION 19
Tiles
Note: While the heating cable is protected by the DITRA-HEAT and DITRA-HEAT-TB matting, be careful when applying the mortar to not
damage the cable with the notched trowel.
1 Tile can be installed over DITRA-HEAT and
2 Solidly embed the tiles in the setting material,
3 Periodically remove and check a tile to
DITRA-HEAT-TB immediately; no need to
making sure to observe the open time of the
ensure that full coverage is being attained.
wait for the mortar to cure. Fill the matting
bonding mortar. If the mortar skins over prior
with unmodified thin-set mortar and comb
to tile installation, remove and reapply.
additional mortar over the matting using
a trowel that is appropriate for the size of
the tile.
Note: Coverage may vary with mortar consistency, angle at which the trowel is held, substrate flatness, etc. If full coverage is not achieved, remove
and reapply, making sure to verify proper mortar consistency and application. For large-format tiles, e.g., 12" x 12" (305 mm x 305 mm) and larger,
back-buttering the tiles with a skim coat of thin-set mortar is a useful way to help ensure proper coverage. The skim coat can fill in the concave area on
the back of the tile (ceramic tiles are not perfectly flat) and improve contact with the mortar combed on the substrate.
ESTIMATED THIN-SET COVERAGE
To bond DITRA-HEAT to the substrate:
Use one 50 lb. (22.68 kg) bag of mortar per 100 ft2 (9.3 m2).
To bond the tile to the DITRA-HEAT, using a 1/4" x 3/8" (6 mm x 10 mm) square- or U-notched trowel:
Use one 50 lb (22.68 kg) bag of mortar per 40 - 50 ft2 (3.7 - 4.6 m2).
To bond the tile to the DITRA-HEAT, using a 1/2" x 1/2" (13 mm x 13 mm) square- or U-notched trowel:
Use one 50 lb (22.68 kg) bag of mortar per 30 - 40 ft2 (2.8 - 3.7 m2).
4 Once the tile installation is complete, retest
the heating cable and record values in the
heating cable tests log (page 30).
Allow the assembly to cure for 7 days after
grouting before putting the floor warming
into service.
Operating Tips
• Do not place furniture or mats over the floor temperature sensor. They can act as insulation and raise the floor temperature reading at the thermostat.
This may cause the heating to turn off before the remainder of the floor reaches the desired temperature.
• Area rugs are not recommended over the DITRA-HEAT system.
• Futons, mattresses, floor-level furniture, pillows, etc. must not be placed directly onto the heated floor. Placement of items directly onto the heated floor
will prevent heat diffusion (i.e., air circulation) and could result in damage.
20
INSTALLATION
THIN-SET FACTS
Discussion of thin-set mortars and Schluter®-DITRA-HEAT installations
QUESTION: Can ceramic tile, including porcelain tile, be set
on DITRA-HEAT with unmodified thin-set mortar?
ANSWER: YES. In fact, we recommend it. Here’s why:
Portland cement-based unmodified thin-set mortars are dependent on the presence
of moisture for hydration in order to gain strength. Since DITRA-HEAT is impervious, it
does not deprive the mortar of its moisture. This allows the cement to properly hydrate,
resulting in a strong, dense bond coat. In fact, after the mortar has reached final set
(usually within 24 hours), unmodified thin-set mortars achieve higher strengths when
cured in continually moist conditions.
QUESTION: Can ceramic tile, including porcelain tile, be set on DITRA-HEAT with latex-modified
thin-set mortar?
ANSWER: We DON'T recommend it. Here’s why:
Latex-modified mortars must air dry for the polymers to coalesce and form a hard film in order to gain strength. When sandwiched between
two impervious materials such as DITRA-HEAT and ceramic tile, including porcelain tile, drying takes place very slowly through the open
joints in the tile covering. [According to the TCNA Handbook for Ceramic, Glass, and Stone Tile Installation, this drying period can fluctuate
from 14 days to over 60 days, depending on the geographic location, the climatic conditions, etc.]. Therefore, extended cure times would
be required before grouting if using modified thin-set mortars between DITRA-HEAT and ceramic tile, including porcelain tile. If extended
cure times were not observed, the results could be unpredictable.
ADDITIONAL NOTES
Over 25 years of field experience and testing by the Tile Council of North America (TCNA) support the efficacy of using unmodified thin-set
mortars to bond ceramic tile, including porcelain tile, to uncoupling membranes.
Remember, the type of mortar used to apply DITRA-HEAT depends on the type of substrate. The mortar must bond to the substrate and
mechanically anchor the fleece on the underside of the DITRA-HEAT. For example, bonding DITRA-HEAT to wood requires latex-modified
thin-set mortar. When bonding DITRA-HEAT to particularly dry, porous concrete with unmodified thin-set mortar, the slab should be
moistened to saturate the concrete and help prevent premature drying of the mortar. Excess or standing surface water must be removed
prior to installation. Additionally, all mortars (modified and unmodified) have an acceptable temperature range that must be observed during
application and curing.
THIN-SET FACTS
21
TESTING & CERTIFICATIONS
Product Evaluation
Schluter®-Systems is committed to providing reliable installation systems for ceramic and stone tile. As part of this commitment, we have
invested considerable resources in testing our products and obtaining certifications where applicable to provide our customers and local
code officials with relevant data that supports the efficacy of our systems. All the testing referenced below was performed by independent
laboratories.
Uncoupling and Support/Load Distribution
The method used to establish the overall performance of a tile assembly under loading is the ASTM C627 “Standard Test Method for
Evaluating Ceramic Floor Tile Installation Systems Using the Robinson Type Floor Tester.” The assembly is tested in cycles using a loaded,
revolving carriage. Load, wheel hardness, and number of revolutions vary with each cycle. Once a specified level of damage is exceeded,
the test is stopped. The TCNA Handbook for Ceramic, Glass, and Stone Tile Installation assigns performance levels to an assembly
based on the number of cycles successfully completed. The ratings include residential, light, moderate, heavy, and extra heavy, in order
of improving performance.
Report Number
Substrate
Joist Spacing
Tile
Rating
OSB
19.2" o.c.
12" x 12" porcelain
Extra Heavy
Schluter®-DITRA-HEAT
TCNA-415-13
TCNA-415-13
OSB
24" o.c.
12" x 12" carrara marble
Light
TTMAC-UFT09-2013
Concrete
N/A
12" x 12" porcelain
Moderate
TCNA-415-13
Concrete
N/A
2" x 2" porcelain
Light
TCNA-455-15 (1)
Concrete
N/A
12" x 12" porcelain
Light
TCNA-455-15 (2)
Concrete
N/A
2" x 2" porcelain
Light
TNCA-455-15 (3)
Concrete
N/A
12" x 12" marble
Residential
TCNA-455-15 (4)
Plywood
19.2" o.c.
12" x 12" porcelain
Light
Schluter®-DITRA-HEAT-TB
Assembly Notes:
1. All plywood and OSB subfloors were 23/32" (3/4" nom.) -thick; 11/32" (3/8" nom.) -thick OSB underlayment added for carrara marble test
2. Modified thin-set mortar (ANSI A118.11) to bond membrane to plywood and OSB
3. Unmodified thin-set mortar (ANSI A118.1) to bond membrane to concrete
4. Unmodified thin-set mortar (ANSI A118.1) to bond tile to membrane
5. High Performance Cement Grout (ANSI A118.7)
The test results above demonstrate that DITRA-HEAT performs extremely well under load while at the same time providing flexibility within
the shear plane. DITRA-HEAT-TB was found to be suitable for residential and light commercial traffic, depending on the substrate and tile
chosen.
Waterproofing
DITRA-HEAT and DITRA-HEAT-TB provide reliable waterproofing in interior applications. The products have been found to meet or exceed
the requirements of the American National Standard Specifications for Load Bearing, Bonded, Waterproof Membranes for Thin-set
Ceramic Tile and Stone Installation A118.10.
Vapor Management
The free space under the DITRA-HEAT and DITRA-HEAT-TB mattings allow the substrate to breathe, while the material composition
provides for a very low water vapor permeance, which prevents any significant vapor intrusion in the tile assembly from below.
Product
Schluter -DITRA-HEAT
Test Method
®
Schluter®-DITRA-HEAT-TB
ASTM E96*
Performance
0.21 perms
0.48 perms
*Using the water method at 73ºF (23ºC) and 50% RH
The result is the DITRA-HEAT and DITRA-HEAT-TB effectively manage vapor and prevent damage to the tile covering as a result.
22
TESTING & CERTIFICATIONS
Certifications
Heating cables
The DITRA-HEAT-E-HK heating cables sets are certified or listed to the following standards and usage:
• CAN/CSA-C22.2 No. 130-03 "Requirements for Electrical Resistance Heating Cables and Heating Device Sets" under usage
markings GXW for general use (G) with a wet rating (W), but specifically (X) for embedded indoor floor warming applications.
• UL 1673 "Electric Space Heating Cables" for installation in poured masonry floors within enclosed structures.
• ANSI/IEEE 515.1-2005 "IEEE Standard for the Testing, Design, Installation, and Maintenance of Electrical Resistance Heat Tracing
for Commercial Applications" for installation Type C embedded floor warming within enclosed structures.
Thermostat
The DITRA-HEAT-E-RSD digital thermostat is:
• Certified to CSA C22.2 No. 24-93 (Reaffirmed 2003) “Temperature-Indicating and Regulating Equipment”.
• Listed to UL 873 “Temperature-Indicating and Regulating Equipment” 11th Edition, containing revisions through and including April
18th, 2006.
The DITRA-HEAT-E-RT/-R digital thermostats are UL listed according to the following standards:
• UL 60730-1 “Automatic Electrical Controls for Household and Similar Use – Part 1: General Requirements”
• UL 60730-2-9 “Automatic Electrical Controls for Household and Similar Use – Part 2-9: Particular Requirements for Temperature
Sensing Controls”
• CSA E60730-1:13 “Automatic Electrical Controls for Household and Similar Use – Part 1: General Requirements”
• CSA E60730-2-9 “Automatic Electrical Controls for Household and Similar Use – Part 2-9: Particular Requirements for
Temperature Sensing Controls”
• UL 943 4th ed. “Ground-Fault Circuit Interrupters”
• CSA C22.2 No. 144.1-06 “Ground-Fault Circuit Interrupters”
Certifications and listings may be accessed
Membrane
via our website at www.schluter.com
DITRA-HEAT:
• ICC-ES Report No. ESR-2467
• ICC-ES PMG Report No. PMG-1204
• U.S. Pat. No. 8,950,141, and U.S. DES. PAT. No. D706459
Canada D Schluter Systems L.P. and other patents pending
DITRA-HEAT-TB:
• ICC-ES Report No. ESR-2467
• ICC-ES PMG Report No. PMG-1204
• Patent pending
Green Building
DITRA-HEAT has been independently tested for VOC emissions per California Specification 01350: “Standard Practice for the Testing of
Volatile Organic Emissions from Various Sources Using Small-Scale Environmental Chambers”.
Property
Test Method
Performance
VOC emissions
CA 01350 and ASTM D5116
0.003 mg/m3
DITRA-HEAT was found to emit 0.03 mg/m3 total VOCs. Thus, DITRA-HEAT complies with tolerable levels outlined in CA 01350. Products
in compliance with the tolerable levels outlined in this specification are specified by many green building standards and rating systems,
including:
• LEED v4, IEQ Credit: Low-Emitting Materials
• NAHB National Green Building Standard (ICC 700), 901.7, 901.8: Pollutant Source Control - Hard-Surface flooring, Wall coverings
• Green Globes for New Construction 2014 (v1.3), 3.7.1: Volatile Organic Compounds
• International Green Construction Code (IgCC), 806.4, 806.5: Flooring, Wall Systems
• Standard for the Design of High Performance Green Buildings (ASHRAE 189.1), 8.4.2.3, 8.4.2.6: Floor Covering Materials, Wall
Systems
• California Green Building Standards Code (CALGreen), 4.504.2 (Res), 5.504.4 (Non-Res): Finish Material Pollutant Control
• CHPS, EQ2.2: Low-Emitting Materials
TESTING & CERTIFICATIONS
23
DITRA-HEAT-TB
Solution to improve floor warming response time
The challenge of concrete substrates
Concrete substrates can absorb enough heat energy to significantly increase the time it takes for floors to warm up, particularly when there
is no insulation layer below the concrete. In some cases, floors may never reach the desired temperature. There are solutions to address
this challenge, such as installing the heating cables at closer spacing for increased energy output or installing a thermal break prior to
heating cable installation to reduce heat loss into the substrate. However, both of these solutions increase material and labor costs.
A one-step solution
Schluter®-DITRA-HEAT-TB offers the same functions as the Schluter®-DITRA-HEAT membrane, but also features an integrated thermal
break in the form of a thicker bonding fleece. The thermal break reduces heat loss to the substrate and improves the floor warming
response time at the standard three stud cable spacing. Since an effective thermal break can be created with a relatively low R-value, the
DITRA-HEAT-TB membrane is only 5/16" (8 mm)-thick, compared to DITRA-HEAT at 1/4" (5.5 mm)-thick.
Thermal resistance
The DITRA-HEAT-TB thermal break was tested according to the ASTM C518 “Standard Test Method for Steady-State Thermal Transmission
Properties by Means of the Heat Flow Meter Apparatus” and determined to have an R-value of 0.35. This value may seem low, but it is
sufficient to improve the system warm up time. Increased thermal resistance may be required if improving overall energy efficiency is also
desired and the floor warming system is to be used for extended periods instead of limited hours during the morning and at night.
Floor warming performance
In laboratory testing, DITRA-HEAT-TB reduced floor warming response time from 68°F (20°C) to 78°F (25.5°C) by approximately 80% (90
minutes) compared to DITRA-HEAT over a concrete substrate.
Wood substrates act as insulators and typically do not pose the same challenges as concrete substrates. In the same laboratory testing,
DITRA-HEAT-TB only reduced floor warming response time from 68°F (20°C) to 78°F (25.5°C) by approximately 20% (5 minutes) compared
to DITRA-HEAT over a plywood substrate.
Figure 1 - DITRA-HEAT-TB Performance over Concrete
Figure 2 - DITRA-HEAT-TB Performance over Wood
85.0
93.0
83.0
88.0
79.0
77.0
73.0
73.0
DITRA-HEAT
DITRA-HEAT-TB
71.0
Temperature (ºF)
Temperature (ºF)
81.0
83.0
78.0
DITRA-HEAT
DITRA-HEAT-TB
73.0
69.0
67.0
68.0
0
10 20 30
40 50
60
70
80 90 100 110 120
0
10
20
30
Time (minutes)
40
50
60
70
80
90 100 110 120
Time (minutes)
Schluter®-DITRA-HEAT-E-HK heating cables were spaced at three studs in all of the above tests.
Results above are based upon laboratory testing. Actual results may vary depending on various factors, including concrete substrate
thickness, concrete substrate temperature, room temperature, heat losses, etc.
24
DITRA-HEAT-TB
208 V APPLICATIONS
Discussion of Schluter®-DITRA-HEAT-E-HK Heating Cables in
208 V Applications
Schluter®-DITRA-HEAT offers complete flexibility when creating warm floors in any application. Schluter®-DITRA-HEAT-E-HK heating cables
are designed for use with common 120 V and 240 V power sources. 208 V power sources are used in some cases to handle larger loads
(e.g., HVAC equipment, motors, etc.) or to improve energy efficiency.
Schluter®-Systems recommends using the DITRA-HEAT-E-HK 240 V heating cables when a 208 V power source is present. However, this
will reduce the heating power by 25% to 9.5 W/ft2 at the standard 3-stud cable spacing, which may not be sufficient power to warm the
floor in these applications. To offset the effect of the lower voltage, we recommend installing the heating cable at a 2-stud spacing in these
applications. This results in an increased heating power of 14.2 W/ft2, which will ensure adequate performance.
The heating cable will cover 33% less area when spaced at 2 studs compared to 3 studs. Therefore, a longer heating cable must be selected
to cover a given area in these applications. Coverage for each 240 V heating cable spaced at 2 studs can be found in the table below.
DITRA-HEAT-E-HK 240 V Heating Cables in 208 V Applications at 2 Stud Spacing
Item No.
Length (ft - m)
Area (ft2 - m2)
Power (W)
Average Power
(W/ft2 - W/m2)
Current (A)
DHE HK 240 11
35.3 – 10.8
7.1 – 0.7
101
14.2 - 152.8
0.5
DHE HK 240 16
53.1 – 16.2
10.7 – 1.0
152
14.2 - 152.8
0.7
DHE HK 240 21
70.5 – 21.5
14.2 – 1.3
203
14.2 - 152.8
1.0
DHE HK 240 27
88.2 – 26.9
17.8 – 1.7
254
14.2 - 152.8
1.2
DHE HK 240 32
105.8 – 32.2
21.3 – 2.0
304
14.2 - 152.8
1.5
DHE HK 240 38
124.1 – 37.8
25.0 – 2.3
356
14.2 - 152.8
1.7
DHE HK 240 43
141 – 43.0
28.4 – 2.6
405
14.2 - 152.8
1.9
DHE HK 240 53
176.3 – 53.7
35.5 – 3.3
506
14.2 - 152.8
2.4
DHE HK 240 64
211.6 – 64.5
42.7 – 4.0
608
14.2 - 152.8
2.9
DHE HK 240 75
248.2 – 75.7
50.0 – 4.7
713
14.2 - 152.8
3.4
DHE HK 240 85
282.1 – 86.0
56.9 – 5.3
810
14.2 - 152.8
3.9
DHE HK 240 103
339.4 – 103.4
68.4 – 6.4
975
14.2 - 152.8
4.7
DHE HK 240 129
425.8 – 129.8
85.8 – 8.0
1223
14.2 - 152.8
5.9
DHE HK 240 145
480.5 – 146.5
96.9 – 9.0
1380
14.2 - 152.8
6.6
DHE HK 240 167
551 – 167.9
111.1 – 10.3
1583
14.2 - 152.8
7.6
DHE HK 240 183
605.9 – 184.7
122.1 – 11.4
1740
14.2 - 152.8
8.4
DHE HK 240 204
673.8 – 205.4
135.8 – 12.6
1935
14.2 - 152.8
9.3
DHE HK 240 225
744.4 – 226.9
150.1 – 13.9
2138
14.2 - 152.8
10.3
DHE HK 240 269
888 – 270.7
179.0 – 16.6
2550
14.2 - 152.8
12.3
We recommend consulting with a qualified electrician for design and installation of your DITRA-HEAT system on a 208 V power source. Keep
in mind during design of the system that the DITRA-HEAT-E-RT/-RSD/-R thermostats have an electrical current limit of 15 A.
208 V APPLICATIONS
25
NATURAL STONE
Discussion of natural stone and single-layer wood subfloors
Natural stone is a product of nature with a wide variety of colors, patterns, and textures that come together to distinguish it as one of the
premiere surface coverings available on the market. Some of stone’s characteristics, which add to its beauty and uniqueness, are veins,
fissures, starts, and dry-seams. While these characteristics enhance its aesthetic appeal, they’re also indicators that point to the inherent
variability of the flexural strength of natural stone, which can have detrimental effects on serviceability. This variability is underscored by
examining the range of typical flexural (bending) strengths of ceramic tile compared to the range of strength for some common natural stones.
Schluter®-Systems contracted the Tile Council of North America (TCNA) to perform flexural strength testing on various commercially available
ceramic tiles and dimension stones guided by the ASTM C880 Standard Test Method for Flexural Strength of Dimension Stone. Five samples
of each tile and stone were tested, with the minimum recorded values displayed in the figure below. We have chosen to show only minimum
values since these represent the weakest samples, which would be most prone to cracking in service over a bending substrate.
6000
Minimum Recorded Flexural Strength (psi)
5236
5000
4485
4241
4000
3000
2490
2438
2000
1856
1488
1000
539
0
Porcelain A
Ceramic B
Porcelain B
Granite
Ceramic A
White Carrara
Slate
Crema Marfil
337
Travertine
It is clear from the figure that the minimum recorded flexural strengths of these dimension stones tend to be significantly less than those
of the ceramic tiles. In some cases, the differences are dramatic. For example, the minimum recorded flexural strength of the weakest
travertine sample (337 psi) was only 14% of the minimum flexural strength of the weakest ceramic sample (2438 psi). In other words, the
weakest ceramic sample was more than 7 times as strong as the weakest travertine sample. As another example, the minimum recorded
flexural strength of the weakest porcelain sample is more than 12 times as strong as the minimum recorded flexural strength of the weakest
travertine sample.
Q. Why does Schluter®-Systems recommend a double-layer wood floor for installing natural stone over DITRA-HEAT and DITRA-HEAT-TB?
A. There are three principle reasons: 1) As illustrated above, the fact that most stone products have a minimum flexural strength that
is substantially lower than what is typical for ceramic tile; 2) Stones are products of nature and complex heterogeneous materials with
naturally occurring regions of discontinuity, such as veins and fissures. Such features can be weaker than the surrounding stone fabric and
act as “stress risers,” concentrating bending stresses within the region of discontinuity; and 3) When wood floor assemblies are subjected
to forces such as loading – both live and dead loads – they produce flexural stresses in the surface covering which can cause weak and
brittle materials to break or crack.
Engineering mechanics as well as field observations show that the location of maximum flexural stresses in the floor assembly is directly
over the floor joists and at seams in the subfloor panels. Therefore, we recommend double-layer wood floors when installing natural stone
in order to increase the stiffness of the sheathing assembly and position underlayment seams away from the joists to minimize flexural
stresses in the stone covering directly above the joists and at seams. Refer to page 14 for underlayment installation guidelines. For more
information on the development of these guidelines, please refer to the article titled “Position of Underlayment to Prevent Cracked Tile and
Grout” on our website at www.schluter.com/5138.aspx.
26
NATURAL STONE
PRODUCT & ORDERING INFO
The ordering information for the Schluter®-DITRA-HEAT, DITRA-HEAT-TB, and KERDI components outlined in this Handbook is located
below. For technical support, Illustrated Price List, or to receive additional information on our complete product line, please call 800-472-4588
(USA) or 800-667-8746 (Canada), or visit our comprehensive website at www.schluter.com.
Schluter ®-DITRA-HEAT
DITRA-HEAT is a polypropylene membrane with a cut-back stud structure and an anchoring fleece laminated to the
underside. The matting is 1/4" (5.5 mm) thick. The stud structure is specifically designed to secure DITRA-HEAT-E-HK
electric floor heating cables. DITRA-HEAT integrates customizable electric floor warming with the functions associated with
DITRA: uncoupling, waterproofing, vapor management and support to ensure a long lasting installation.
Uncoupling and waterproofing membrane (1/4" – 5.5 mm)
Item No.
Item
Dimensions
DH5 12M
Roll
3' 3" x 41' 1" = 134.5 ft2 (1 m x 12.5 m = 12.5 m2)
DH5 MA
Sheet
3' 3" x 2' 7" = 8.6 ft2 (1 m x 0.8 m = 0.8 m2)
U.S. Pat. No. 8,950,141, and U.S. DES. PAT. No. D706459
Canada D Schluter Systems L.P. and other patents pending
Schluter ®-DITRA-HEAT-TB
DITRA-HEAT-TB is a polypropylene membrane with a cut back stud structure and a thermal break anchoring fleece
laminated to the underside. The matting is 5/16" (8 mm) thick. The stud structure is specifically designed to secure DITRAHEAT-E-HK electric floor heating cables. The thermal break fleece reduces heat loss to the substrate while improving floor
warming response time. DITRA-HEAT integrates customizable electric floor warming with the functions associated with
DITRA: uncoupling, waterproofing, vapor management and support to ensure a long lasting installation.
Uncoupling and waterproofing membrane with thermal break (5/16" - 8 mm)
Item No.
DHTB810M
DHTB8MA
Patent pending
Item
Roll
Sheet
Dimensions
3' 3" x 33' = 108 ft2 (1 m x 10 m = 10 m2)
3' 3" x 2' 7" = 8.6 ft2 (1 m x 0.8 m = 0.8 m2)
Schluter ®-DITRA-HEAT-E-HK
DITRA-HEAT-E-HK are twisted pair heating cables designed for integration with the DITRA-HEAT and DITRA-HEATTB uncoupling membranes in interior floor warming applications. The cables can be installed without returning to the
thermostat and produce virtually zero electromagnetic fields.
Item No.
Each heating cable includes a floor
temperature sensor compatible
with
the
DITRA-HEAT-E-RT/RSD/-R thermostats and features
an approximately 7 ft (2.1 m) long
cold lead.
Heating cable (120 V)
DHE HK 120 11
DHE HK 120 16
DHE HK 120 21
DHE HK 120 27
DHE HK 120 32
DHE HK 120 38
DHE HK 120 43
DHE HK 120 51
DHE HK 120 64
DHE HK 120 73
DHE HK 120 83
DHE HK 120 92
DHE HK 120 102
DHE HK 120 113
DHE HK 120 134
Heating cable (240 V)
DHE HK 240 11
DHE HK 240 16
DHE HK 240 21
DHE HK 240 27
DHE HK 240 32
DHE HK 240 38
DHE HK 240 43
DHE HK 240 53
DHE HK 240 64
DHE HK 240 75
DHE HK 240 85
DHE HK 240 103
DHE HK 240 129
DHE HK 240 145
DHE HK 240 167
DHE HK 240 183
DHE HK 240 204
DHE HK 240 225
DHE HK 240 269
Length
Area
Total Power
35.3 ft (10.8 m)
52.9 ft (16.1 m)
70.5 ft (21.5 m)
88.2 ft (26.9 m)
105.8 ft (32.2 m)
124.1 ft (37.8 m)
141.1 ft (43.0 m)
169.8 ft (51.8 m)
212.9 ft (64.9 m)
240.2 ft (73.2 m)
275.5 ft (84.0 m)
303.0 ft (92.4 m)
336.9 ft (102.7 m)
372.2 ft (113.4 m)
444.0 ft (135.3 m)
10.7 ft2 (1.0 m2)
16.0 ft2 (1.5 m2)
21.3 ft2 (2.0 m2)
26.7 ft2 (2.5 m2)
32.0 ft2 (3.0 m2)
37.5 ft2 (3.5 m2)
42.7 ft2 (4.0 m2)
51.4 ft2 (4.8 m2)
64.4 ft2 (6.0 m2)
72.7 ft2 (6.8 m2)
83.3 ft2 (7.7 m2)
91.7 ft2 (8.5 m2)
101.9 ft2 (9.5 m2)
112.6 ft2 (10.5 m2)
134.3 ft2 (12.5 m2)
135 W
203 W
270 W
338 W
405 W
475 W
540 W
650 W
815 W
920 W
1055 W
1160 W
1290 W
1425 W
1700 W
35.3 ft (10.8 m)
53.1 ft (16.2 m)
70.6 ft (21.5 m)
88.2 ft (26.9 m)
105.8 ft (32.2 m)
124.1 ft (37.8 m)
141.0 ft (43.0 m)
176.3 ft (53.7 m)
211.6 ft (64.5 m)
248.2 ft (75.7 m)
282.1 ft (86.0 m)
339.4 ft (103.4 m)
425.8 ft (129.8 m)
480.5 ft (146.5 m)
551.0 ft (167.9 m)
605.9 ft (184.7 m)
673.8 ft (205.4 m)
744.4 ft (226.9 m)
888.0 ft (270.7 m)
10.7 ft2 (1.0 m2)
16.1 ft2 (1.5 m2)
21.4 ft2 (2.0 m2)
26.7 ft2 (2.5 m2)
32.0 ft2 (3.0 m2)
37.5 ft2 (3.5 m2)
42.6 ft2 (4.0 m2)
53.3 ft2 (5.0 m2)
64.0 ft2 (5.9 m2)
75.1 ft2 (7.0 m2)
85.3 ft2 (7.9 m2)
102.7 ft2 (9.5 m2)
128.8 ft2 (12.0 m2)
145.3 ft2 (13.5 m2)
166.7 ft2 (15.5 m2)
183.3 ft2 (17.0 m2)
203.8 ft2 (18.9 m2)
225.2 ft2 (20.9 m2)
268.6 ft2 (25.0 m2)
135 W
203 W
270 W
338 W
405 W
475 W
540 W
675 W
810 W
950 W
1080 W
1300 W
1630 W
1840 W
2110 W
2320 W
2580 W
2850 W
3400 W
Average Power
(Watts/ft2 – Watts/m2)
Current
(Amps)
12.6 - 135.8
12.7 - 136.3
12.7 - 136.3
12.7 - 136.3
12.7 - 136.3
12.7 - 136.3
12.7 - 136.3
12.7 - 136.3
12.7 - 136.3
12.7 - 136.3
12.7 - 136.3
12.7 - 136.3
12.7 - 136.3
12.7 - 136.3
12.7 - 136.3
1.1
1.7
2.3
2.8
3.4
4.0
4.5
5.4
6.8
7.7
8.8
9.7
10.7
11.9
14.2
12.6 - 135.8
12.6 - 135.8
12.7 - 136.3
12.7 - 136.3
12.7 - 136.3
12.7 - 136.3
12.7 - 136.3
12.7 - 136.3
12.7 - 136.3
12.7 - 136.3
12.7 - 136.3
12.7 - 136.3
12.7 - 136.3
12.7 - 136.3
12.7 - 136.3
12.7 - 136.3
12.7 - 136.3
12.7 - 136.3
12.7 - 136.3
0.6
0.8
1.1
1.4
1.7
2.0
2.3
2.8
3.4
4.0
4.5
5.4
6.8
7.7
8.8
9.7
10.7
11.9
14.2
PRODUCT & ORDERING INFO
27
Schluter ®-DITRA-HEAT-E-HK-RK Repair Kit
The DITRA-HEAT-E-HK-RK heating cable repair kit is used to make one repair to the heating portion (gray
section) of the DITRA-HEAT-E-HK cable in the event of damage such as cuts by other trades.
Repair kit for Schluter®-DITRA-HEAT-E-HK Heating Cables
Item No.
Description
DHEHKRK
DITRA-HEAT-E-HK Repair Kit
Schluter ®-DITRA-HEAT-E-RSD
DITRA-HEAT-E-RSD is a digital thermostat to control the DITRA-HEAT-E-HK heating cables (either 120 V or
240 V). The thermostat features a 5 mA built-in ground fault circuit interrupter (GFCI) with indicator light. DITRAHEAT-E-RSD features more than 250 pre-set programs and anticipated start function. A floor temperature sensor is
included. Multiple heating cables may be connected to the thermostat, up to the total heating load limit of 15 amps.
Digital thermostat with remote floor temperature sensor
Item No.
DHE RS D/BW
Description
Programmable thermostat with floor temperature sensor in bright white
Schluter ®-DITRA-HEAT-E-RT/-R/-RR
Programmable
Non-programmable
DITRA-HEAT-E-RT/-R are digital thermostats to control the DITRA-HEAT-E-HK heating cables (either 120 V
or 240 V). The thermostats feature a 5 mA built-in ground fault circuit interrupter (GFCI) with indicator light. The
programmable thermostat features LCD touchscreen controls and comes with a pre-set schedule, but may be
adjusted to fit any schedule. The non-programmable version features a simple on/off function. Multiple heating
cables may be connected to the thermostats, up to the total heating load limit of 15 amps. The DITRA-HEAT-E-RR
power module may be used in conjunction with the thermostat when the heating load exceeds 15 amps (e.g., in
large floor applications). A floor temperature sensor is included.
Digital thermostat with remote floor temperature sensor
Item No.
Description
DHE RT 102/BW
Touchscreen programmable thermostat in white with floor temperature sensor
DHE RT 103/BW
DHE RR 1/BW
Non-programmable thermostat in white with floor temperature sensor
Power module for use with DHE RT thermostats
Power module
Schluter ®-DITRA-HEAT-E-KIT
The DITRA-HEAT-E-KIT is an all-inclusive package containing the DITRA-HEAT uncoupling membrane, heating
cable, and DITRA-HEAT-E-RSD programmable thermostat.
Kit containing all necessary components
Item No.
Matting
Heating cable
Thermostat
DHE K 120 40
5 sheets – 43.1 ft2 (4.0 m2)
88' 3" – 26.7 ft2 (26.9 m – 2.5 m2)
1 – white, programmable
DHE K 120 56
7 sheets – 60.3 ft2 (5.6 m2)
124' 0" - 37.5 ft2 (37.8 m - 3.5 m2)
1 – white, programmable
Schluter ®-KERDI-BAND
KERDI-BAND is a waterproofing strip used to seal butt joints and floor/wall connections with the KERDI and
DITRA membranes.
Waterproofing strip
Item No.
KEBA 100/125/5M
KEBA 100/125/10M
KEBA 100/185/5M
KEBA 100/250/5M
KEBA 100/125
KEBA 100/185
KEBA 100/250
Note: 1 mil = 1 one-thousandth of an inch
28
PRODUCT & ORDERING INFO
Width
5" - 125 mm
5" - 125 mm
7-1/4" - 185 mm
10" - 250 mm
5" - 125 mm
7-1/4" - 185 mm
10" - 250 mm
Length
16' 5" - 5 m
33' - 10 m
16' 5" - 5 m
16' 5" - 5 m
98' 5" - 30 m
98' 5" - 30 m
98' 5" - 30 m
Thickness
4 mil
4 mil
4 mil
4 mil
4 mil
4 mil
4 mil
Schluter ®-KERDI-FLEX
KERDI-FLEX is a flexible polyethylene waterproofing strip used to seal movement joints over DITRA-HEAT in specialty
applications where large movements are expected (e.g., over expansion joints).
Waterproofing strip for use above movement joints
Item No.
FLEX 125/5M
FLEX 250/5M
FLEX 125/30
FLEX 250/30
Width
5" - 125 mm
10" - 250 mm
5" - 125 mm
10" - 250 mm
Length
16' 5" - 5 m
16' 5" - 5 m
98' 5" - 30 m
98' 5" - 30 m
Thickness
12 mil
12 mil
12 mil
12 mil
Note: 1 mil = 1 one-thousandth of an inch
Schluter ®-KERDI-KERECK-F
KERDI-KERECK-F are preformed, seamless corners made of KERDI for waterproofing inside and outside corners.
Waterproofing for corners
Item No.
KERECK/FI 2
KERECK/FI 10
KERECK/FA 2
KERECK/FA 10
Thickness
4 mil
4 mil
4 mil
4 mil
Packaging
2 Inside corners
10 Inside corners
2 Outside corners
10 Outside corners
Note: 1 mil = 1 one-thousandth of an inch
Schluter ®-KERDI-FIX
KERDI-FIX is a single-component sealing and bonding compound with a silane-modified polymer base. It is odor-neutral,
UV- and weather-resistant, and contains no solvents. KERDI-FIX is elastomeric and bonds well to most materials, such
as wood, stone, concrete, metal, glass, and many plastics. KERDI-FIX is suitable for the bonding of KERDI waterproofing
membrane to vertical sections of floor/wall transitions that will not accept a bond to unmodified thin-set mortar.
Sealing and bonding compound
Item No.
KERDIFIX/color*
Description
Cartridge – 9.81 oz (290 ml)
*Color Codes
BW
Bright
white
G
Grey
Schluter ®-DITRA-ROLLER
Used to embed DITRA membranes in the bond coat during membrane installation. The lightweight DITRA-ROLLER
features a 14-1/2" (37 cm) wide roller and a shelf for placing 50 to 75 lbs of weight (e.g., bag of thin-set mortar or
grout, box of tiles, etc.). Between uses, it can be conveniently disassembled for transport and storage.
Used to embed uncoupling membranes in the bond coat
Item No.
DIRO
Width
14-1/2" (37 cm)
PRODUCT & ORDERING INFO
29
HEATING CABLE TESTS LOG
Validation for warranty coverage
Each heating cable is subject to factory quality control. However, damage to the cables may happen after the product leaves the factory. In order to ensure
that the cable quality remains unchanged throughout the installation process and for warranty purposes, tests must be conducted while the cable is still on the
spool and during two specific subsequent steps. Measurements must be recorded in the table below and compared to initial measurements taken when the
cable was on the spool in order to enable you to detect any changes related to the electrical property of the cable. Any installation-related cable damages are
not covered by the warranty. See page 17 in this DITRA-HEAT Installation Handbook for complete heating cable testing instructions.
The homeowner/end user must submit a copy of the completed heating cable tests log, including “Test 1: Conductor Resistance,” “Test 2: Conductor
and Ground Braid Continuity,” and “Floor Temperature Sensors Test”, with the warranty registration card within 14 days of installing the product to qualify
for resolution for failure of the Schluter®-DITRA-HEAT-E-HK heating cables within the Schluter®-DITRA-HEAT & Schluter®-DITRA-HEAT-TB Limited System
Warranty for ten (10) years. Completion of “Test 3: Insulation Resistance,” in addition to those listed above, will extend the term for resolution for failure
of the Schluter®-DITRA-HEAT-E-HK heating cables within the Schluter®-DITRA-HEAT & Schluter®-DITRA-HEAT-TB Limited System Warranty from ten (10)
years to fifteen (15) years. Registration can be completed by mail or online at www.schluter.com/registerwarranty.
Completion of warranty registration qualifies customers for the system warranty, in which Schluter®-Systems shall a) reinstall or replace the failed portion
of the floor covering assembly or b) pay an amount not to exceed the original square foot cost of the installation of the floor covering assembly verified to
be defective.
Failure to complete this warranty registration will result in a twenty-five (25) year Limited Product Warranty that the Schluter®-DITRA-HEAT-E-HK heating
cable purchased shall be free from defects in material and workmanship effective on the date of purchase by or for the original purchaser. The maximum
liability of the company, in this case is limited to the cost of the original cable multiplied by the percentage of the warranty period remaining.
Homeowner/end user must retain this heating cable tests log for warranty purposes.
Heating Cable Tests Log
Location/Homeowner: _____________________________________________
Date of installation: ___________________________
Certified electrician: _______________________________________________
Date put into service*: __________________________
Identification
Factory Value
Before Installation
After Cable Installation
Test 1: Conductor Resistance Test
Readings must fall within 10% of the factory value printed on the silver heating cable identification tag.
Test 2: Conductor and Ground Braid Continuity Test
Infinity (I) or
Overload (OL)
Test 3: Insulation Resistance Test
Equal to or
greater than
1 Gigaohms**
Floor Temperature Sensors Test
Temperature
Resistance
ºC
ºF
Kohms
10
50
18.1
15
59
14.8
20
68
12.1
25
77
10.0
30
86
8.3
* Allow the assembly to cure for 7 days after grouting before putting the floor warming into service.
**1 Gigaohms = 1 G ohms = 1000 M ohms = 1000 Mega ohms
30
HEATING CABLE TESTS LOG
After Tile Installation
WARRANTY
Schluter ®-DITRA-HEAT and Schluter ®-DITRA-HEAT-TB 10-Year Limited System Warranty
COVERAGE AND CONDITIONS: Subject to the conditions and limitations as stated hereinafter, Schluter®-Systems* warrants that the
Schluter®-DITRA-HEAT system (the “Products”)** will meet all composition and performance criteria for a period of ten (10) years from the date of purchase
only when the Products are used and installed in accordance with the terms and conditions of the Schluter®-DITRA-HEAT Installation Handbook and industry
standard guidelines that are not in conflict with the Handbook in effect at the time of installation. Further, efflorescence is considered to be a natural occurrence
with cementitious materials and is therefore not considered to be a defective condition and is not covered by this warranty. It is the responsibility of the owner/
builder/ installer to ensure the suitability of all building materials and all associated building materials for the owner’s intended use. It is recommended that
the owner consult with an experienced and professional installer. This warranty is conditioned and will be considered null and void and Schluter®Systems will have the right to refuse any claims if: (a) the Products have been improperly stored or installed, (b) any Schluter product comprising the
system has been altered or otherwise modified in any way without the prior written authorization of Schluter®-Systems, (c) the Products are subject to abusive
or abnormal use, lack of maintenance, or use other than that for which the Products were manufactured, and (d) the nameplate numbers have been removed
or modified from any applicable parts (wire), and (e) the homeowner/end user fails to return a copy of the completed heating cable tests log with the
warranty registration card. Homeowner/end user(s) is responsible to return the warranty registration card with the logs, which may be by mail or
www.schluter.com/registerwarranty. (It is AN INSTALLATION REQUIREMENT THAT the heating cable tests log be completed by the installer at time of
installation and a copy returned with the registration card. We recommend the original logs be retained by homeowner/end users.)
RESOLUTION: Upon return of the registration card with the heating cable logs*** and compliance with all the aforementioned conditions, if the Products fail to meet
this warranty, then the owner’s exclusive remedy and the sole obligation of Schluter®-Systems, at its election, shall be to a) reinstall or replace the failed portion of
the floor covering assembly or b) pay an amount not to exceed the original square foot cost of the installation of the floor covering assembly verified to be defective.
Floor covering assembly is defined to include all DITRA-HEAT materials (e.g., matting and heating cables), non-reusable flooring surfaces, and the appropriate setting
and grouting materials. Further, due to conditions beyond the control of Schluter®-Systems (e.g., color and shade availability, discontinuation, normal wear and tear),
Schluter®-Systems cannot guarantee or warrant an exact match to the specific tile, stone, or other flooring materials used in the installation. In such events, substantially
similar materials may be substituted. This warranty does not cover scratches, dents, corrosion or discoloration caused by excessive heat, chemical cleaning products
and abrasive agents. This warranty does not cover the cost of disconnection or installation.
In the event that the registration card and or heating cable tests log is not completed and returned then the Schluter®-DITRA-HEAT-E-HK heating cable shall be subject
to a twenty-five (25) year Limited Product Warranty that each Schluter Heating Cable purchased shall be free from defects in material and workmanship effective on the
date of the purchase by or for the original purchaser. The maximum liability of the company is limited to the cost of the original Cable multiplied by the percentage of
the warranty period remaining.
DISCLAIMER: THERE ARE NO WARRANTIES BEYOND THIS EXPRESSED WARRANTY AS STATED ABOVE. ALL OTHER WARRANTIES, REPRESENTATIONS
OR CONDITIONS, EXPRESSED OR IMPLIED, ARE DISCLAIMED AND EXCLUDED, INCLUDING WARRANTIES, REPRESENTATIONS OR CONDITIONS OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE ARISING BY STATUTE OR OTHERWISE BY LAW OR FROM A COURSE OF DEALING OR
USAGE OF TRADE. SCHLUTER-SYSTEMS EXCLUDES AND IN NO EVENT SHALL HAVE ANY LIABILITY FOR LOST PROFITS OR ANY OTHER INDIRECT, SPECIAL,
INCIDENTAL, PUNITIVE, EXEMPLARY, OR CONSEQUENTIAL DAMAGES, ARISING OUT OF OR OTHERWISE CONNECTED TO FAILURE OF THE PRODUCTS OR
FLOORING SYSTEM OF WHICH THEY ARE PART, NOR MISUSE OF THE PRODUCTS OR FLOORING SYSTEM, REGARDLESS OF ANY STRICT LIABILITY, ACTIVE OR
PASSIVE NEGLIGENCE OF SCHLUTER SYSTEMS, AND REGARDLESS OF THE LEGAL THEORY (CONTRACT OR TORT OR EXTRA-CONTRACTUAL OR OTHER),
NOR FROM ACTS OF WAR, TERRORISM, OVERVOLTAGE, FAULTY AND NEGLIGENT PENETRATION OF THE SYSTEM, FIRES, EXPLOSIONS, ACTS OF GOD,
INTENTIONAL ACTS OF DESTRUCTION OR ANY LOSSES DUE TO STRUCTURAL FAILURE OR OTHER CAUSES UNRELATED TO THE PRODUCTS OR DELAYS,
OR ANY OTHER INCIDENTAL OR CONSEQUENTIAL DAMAGES. THIS WARRANTY IS GIVEN IN LIEU OF ANY OTHER WARRANTY EXPRESSED OR IMPLIED. THE
REMEDIES CONTAINED HEREIN ARE THE ONLY REMEDIES AVAILABLE FOR BREACH OF THIS WARRANTY. THIS LIMITED WARRANTY GIVES YOU SPECIFIC
LEGAL RIGHTS; SOME STATES AND PROVINCES DO NOT ALLOW DISCLAIMERS OR OTHER RESTRICTIONS OF IMPLIED WARRANTIES, SO SOME OF THE ABOVE
DISCLAIMERS MAY NOT APPLY TO YOU.
TRANSFERABILITY: This Limited Warranty extends ONLY to the original end user (defined as original intended owner and user of the property/unit in which the
installation is incorporated - herein referred to as “Owner”) and is not transferable or assignable, unless approved in writing by the Technical Director or an Officer of
Schluter®-Systems or otherwise prohibited by specific state or provincial law.
MODIFICATIONS TO WARRANTY: No changes or modification of any terms or conditions of this warranty are allowed unless authorized by written agreement and
signed by the Technical Director or an Officer of Schluter®-Systems.
EFFECTIVE DATE: This warranty shall supersede and replace any and all prior oral or written warranties, agreements, or other such representations made by or on behalf
of Schluter®-Systems relative to the Products or the application of the Products and shall apply to any installation occurring on or after March 1, 2016.
CLAIMS ON THIS LIMITED WARRANTY: To make a claim under this Limited Warranty, the Owner must provide Schluter®-Systems with written notice within 30 days of
any alleged defect in the Products covered by this Limited Warranty, together with date and proof of purchase of the Products, proof of the costs of the original installation
and name and address of all installers and completed heating cable tests log, failing which this Limited Warranty shall be of no legal effect. Schluter®-Systems reserves
the right at its election and as a condition of this Limited Warranty to inspect the alleged failed and defective condition.
All U.S. Claims shall be sent to:
All Canadian Claims shall be sent to:
Schluter Systems L.P.
Attn: Warranty Claims Dept.
194 Pleasant Ridge Road
Plattsburgh, NY 12901
Schluter Systems (Canada), Inc.
Attn: Warranty Claims Dept.
21100 chemin Ste-Marie
Ste-Anne-de-Bellevue, QC H9X 3Y8
*For the purpose of this warranty Schluter Systems, L.P. shall provide the warranty for end users located in the United States, and Schluter Systems (Canada) Inc.
shall provide the warranty for end users located in Canada. This warranty is limited to sales of the Products made in and intended for use in the United States and Canada.
**Schluter®-DITRA-HEAT System (“the Products”): The products are defined to include Schluter®-DITRA-HEAT and DITRA-HEAT-TB matting and DITRA-HEAT heating
cables.
***To qualify for resolution for failure of the Schluter®-DITRA-HEAT-E-HK heating cables within the Schluter®-DITRA-HEAT & Schluter®-DITRA-HEAT-TB Limited System
Warranty for ten (10) years, complete “Test 1: Conductor Resistance,” “Test 2: Conductor and Ground Braid Continuity,” and “Floor Temperature Sensors Test”.
Completion of “Test 3: Insulation Resistance,” in addition to those listed above, will extend the term for resolution for failure of the Schluter®-DITRA-HEAT-E-HK heating
cables within the Schluter®-DITRA-HEAT & Schluter®-DITRA-HEAT-TB Limited System Warranty from ten (10) years to fifteen (15) years.
WARRANTY
31
© 2016 Schluter Systems L.P.
02/2016
www.schluter.com
554508
Schluter Systems L.P. • 194 Pleasant Ridge Road, Plattsburgh, NY 12901-5841 • Tel.: 800-472-4588 • Fax: 800-477-9783
Schluter Systems (Canada) Inc. • 21100 chemin Ste-Marie, Ste-Anne-de-Bellevue, QC H9X 3Y8 • Tel.: 800-667-8746 • Fax: 877-667-2410
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