Schluter®-DITRA-HEAT-DUO integrates customizable, comfortable electric floor warming with the functions of DITRA: uncoupling, waterproofing, vapor management and support to ensure a long lasting installation. DITRA-HEAT-DUO features an integrated thermal break to reduce heat loss to the substrate, improve floor warming response time, and reduce sound transmission through floor-ceiling assemblies.
Controlling impact sound transmission through floor-ceiling assemblies in multistory construction can present challenges, particularly when ceramic and stone tiles are used. Sound control materials tend to be compressible and not all provide adequate support for tile covering in thin-set applications. DITRA-HEAT-DUO reduces sound transmission, while supporting the covering to ensure a lasting installation.
DITRA-HEAT-DUO 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 for ceramic, porcelain, and stone tiles, significantly reducing installation time and effort compared to uncoupling membranes over other electric floor warming systems. Self-leveling compounds are approved for use only when installing alternative floor coverings over the DITRA-HEAT membranes.
Tile has been successfully installed for thousands of years by incorporating an uncoupling layer, or forgiving shear interface, within the tile assembly. DITRA-HEAT-DUO 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.
DITRA-HEAT-DUO 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.
The free space on the underside of DITRA-HEAT-DUO 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-DUO effectively manages moisture beneath the tile covering.
When placed on a solid foundation, columns or pillars can support tremendous loads. The same physical principle applies to DITRA-HEAT-DUO 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-DUO is virtually incompressible within the tile assembly, the advantages of uncoupling are achieved without sacrificing point load distribution capabilities.
Alternate Floor Coverings over DITRA-HEAT
DITRA-HEAT is suitable for applications with engineered wood, vinyl, wood plastic composite (WPC), luxury vinyl tiles (LVT), luxury vinyl planks (LVP), stone plastic composite (SPC) tiles and planks, and laminate flooring. See the Alternate Floor Coverings over DITRA-HEAT Technical Bulletin for more information, including requirements and limitations.
DITRA-HEAT and DITRA-HEAT-DUO membranes do not require any special maintenance.
All substrates must be clean, even, and load bearing. Bond inhibiting surfaces must be removed prior to the application of DITRA-HEAT-DUO. For complete installation guidelines and warranty criteria, please refer to the downloadable Schluter®-DITRA-HEAT Installation Handbook and the installation video online.
Note: Type, thickness, and format of the tile or stone surface covering must be suitable for the intended application. Minimum tile format is 2″ x 2″ (5 cm x 5 cm).
- Apply thin-set mortar that is suitable for the substrate (mixed to a fairly fluid consistency, but still able to hold a notch) using the DITRA-HEAT trowel, or other 1/4″ x 1/4″ (6 mm x 6 mm) square-notched trowel.
- Apply DITRA-HEAT-DUO 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.
- 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.
- 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.
Alternate Floor Coverings over DITRA-HEAT
Please refer to detail DH-AFC (see the Technical Bulletin – DITRA-HEAT with Alternate Floor Coverings available in the Downloads tab above) and the Schluter®-DITRA-HEAT Installation Handbook for complete installation guidelines. Estimate your membrane and cable requirements to complete your specific installation.