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Schluter Systems

Schluter Systems

Schluter®-Systems develops products specifically for the tile industry to ensure that installations maintain integrity and durability. The Schluter product line includes tile trims, uncoupling membranes, floor heating systems, waterproof building panels, and shower systems.

For more detailed information on any of their products it is highly recommended to go to their Web Site to see all of what they offer and they have plenty of instructions and information.

Schluter Systems
Installation of Schluter®-DITRA-HEAT membrane and heating cable


  • Use Schluter's Calculator Page for help with figuring what you need
  • Select DITRA-HEAT 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 or fixtures = 3"
    • Heat sources (baseboard heaters, fireplaces, forced air heating ducts, etc.) = 8"
    • Floor Drains = 6"
  • Two or more DITRA-HEAT-E-HK heating cables can be connected and controlled by a single DITRA-HEAT-E-RS thermostat if the total current is less than 16 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 16 amps cannot be connected to a single DITRA-HEAT-E-RS thermostat. Additional DITRA-HEAT-E-RS thermostats must be used or a control system comprised of relays and low voltage thermostats may be substituted (if the heating cables are in one room). The system must still incorporate a floor temperature sensor and the circuit must be protected by a GFCI.


  • The substrate must be clean, even, and load bearing. Any leveling of the subfloor must be done prior to installing DITRA-HEAT.
  • For wood substrates, verify that panels are properly fastened.
  • 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" 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 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. Follow gypsum manufacturer’s directions for additional substrate preparation.


Schluter Systems Schluter Systems
Schluter Systems 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" square-notched trowel. Schluter Systems Apply DITRA-HEAT to the floor, fleece side down. Solidly embed the matting into the mortar using a float or screed trowel, making sure to observe the open time of the bonding mortar. If the mortar skins over prior to matting installation, remove and reapply.
Schluter Systems Schluter Systems
Schluter Systems 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. Schluter Systems 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 DITRA-HEAT to the substrate:
Use one 50 lb. bag of mortar per 100 sq.ft.

To bond the tile to the DITRA-HEAT, using a 1/4" x 3/8" square- or U-notched trowel:
Use one 50 lb bag of mortar per 40 - 50 sq.ft.

To bond the tile to the DITRA-HEAT, using a 1/2" x 1/2" square- or U-notched trowel:
Use one 50 lb bag of mortar per 30 - 40 sq.ft.

Installing Cable


43.1 sq. ft.



Schluter Systems
Kit includes: 5 pc 3'3" x 2'7" Uncoupling Membrane (43.1 sq.ft)
88.2' Heating Cable
1 - White Digital Programmable Thermostat.
Use Schluter's Calculator Page for help with figuring what you need

60.3 sq. ft.



Schluter Systems
Kit includes: 7 pc 3'3" x 2'7" Uncoupling Membrane (60.3 sq.ft)
124.1' Heating Cable
1 - White Digital Programmable Thermostat.
Use Schluter's Calculator Page for help with figuring what you need

Schluter Systems



The DITRA-HEAT membrane is designed to secure the system heating cables and serves as a universal substrate for tile coverings. Similar to DITRA, the original uncoupling membrane, DITRA-HEAT provides uncoupling to neutralize the differential movement stresses between the substrate and the tile covering to prevent cracked grout and tile, waterproofing to protect moisture-sensitive substrates, vapor management, and support.

Heating Cable

The twisted pair heating cable is available in 120 and 240 Volt formats. The cables can be installed without returning to the thermostat and produce virtually no electromagnetic fields.

Digital Thermostat

The digital thermostat controls the floor temperature and is offered in both a programmable and non-programmable format. The thermostats feature a built-in Ground Fault Circuit Interrupter (GFCI), digital display with backlit screen, and support both the 120 and 240 Volt cables. The programmable thermostat also includes 250 preset programs.

Various KERDI waterproofing accessories are available. Use KERDI-BAND to seal butt joints or corner joints. KERDI-KERECK pre-formed seamless inside and outside corners and KERDI-SEAL-PS for sealing around pipes or KERDI-SEAL-MV seals mixing valve protrusions, and KERDI-DRAIN Assemblies. KERDI-TROWEL also available for installation of thin-set mortar.

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