Would you like electrical heating in your living room or are you planning to retrofit a floor heating system over an existing screed or wood structure? In addition to the proven functions of Schlüter-DITRA (uncoupling, bonded waterproofing and vapour pressure equalisation), Schlüter-DITRA-HEAT with its special stud structure also enables the installation of electrical heating cables. DITRA-HEAT is therefore not just an ideal substrate for ceramic tiles and natural stone, but also an innovative heating electrical heating system for floor and wall areas.
Schlüter-DITRA-HEAT is a polypropylene membrane with a cut back stud structure and an anchoring fleece laminated on the underside.
It is a universal substrate for tile coverings that forms an uncoupling, waterproofing and vapour pressure equalisation layer and can also be used to attach heating cables.
The substrate for the installation of DITRA-HEAT must be level and load bearing. DITRA-HEAT is installed in thin-bed tile adhesive that is suitable for the substrate, using a notched trowel (recommended size: 6 x 6 mm). The anchoring fleece on the underside of DITRA-HEAT is fully embedded and the fabric bonds with the adhesive. The curing time of the adhesive must be observed.
In floor areas, the heating cables can be installed immediately after adhering DITRA-HEAT, using a minimum spacing of 9 cm (every 3rd stud).
For wall installation, the heating cables are installed once an adequate adhesive bond has been reached. The installation spacing is either 6 cm (every 2nd stud) or 9 cm (every 3rd stud) (for more information, see data sheet 6.4 on page 7, see Downloads).
The use of mats is recommended for wall assemblies.
The tiles are installed directly over DITRA-HEAT in accordance with the applicable regulations, using the thin-bed method. The thin-bed tile adhesive bonds with the cut-back stud structure of the DITRA-HEAT membrane.
DITRA-HEAT is waterproof and resistant to any chemical stresses that typically occur in conjunction with tiled coverings. Where required, DITRA-HEAT can be used to create a certified bonded waterproofing assembly.
DITRA-HEAT uncouples the covering from the substrate and neutralises stresses between the substrate and the tile covering that result from various deformations. The material also bridge tension cracks from the substrate and prevent them from affecting the tile covering.
DITRA-HEAT is a waterproof polypropylene membrane with a relatively high water vapour diffusion seal. With properly installed abutting joints and carefully sealed transitions to walls and structural elements, DITRA-HEAT can be used to create a certified bonded waterproofing assembly with the tile covering.
DITRA-HEAT can be installed in accordance with the waterproofing standard DIN 18534 applicable in Germany. Water exposure classes: W0-I to W3-I*. DITRA-HEAT also features the national technical approval (abP) required in Germany.
Moisture load class according to ZDB: 0 to B0, as well as A.
Schlüter-DITRA-HEAT / -HEAT-DUO has a European Technical Assessment (ETA) in accordance with EAD 030436-00-0503, a certificate of technical approval for the German market (abP) and bears a CE mark.
Where work must be CE-compliant or in accordance with the certificate of technical approval (abP), only system-certified thin-bed mortar should be used. For further information about thin-bed mortars and the corresponding technical approval certificates, please contact us at the address provided on this data sheet.
The waterproofing system DITRA-HEAT/ -HEAT-DUO effectively protects the sub-structure from damage caused by permeating moisture or aggressive substances.
* With abP and/or based on ETA as per EAD 030436-00-0503. Further information on use and installation is available on request from our Technical Department.
Tiles installed over DITRA-HEAT in floor areas should have a minimum size of 5 x 5 cm and a thickness of at least 5.5 mm. DITRA-HEAT transfers mechanical stresses impacting the tile covering directly into the substrate via the bottom of the recesses, which are filled with thin-bed mortar. That makes tile coverings installed on DITRA-HEAT especially durable. The tiles for the corresponding application area must be sufficiently thick and have adequate compressive stability to withstand high traffic loads (e.g. in commercial areas) or large point loads (such as concert pianos, forklifts or shelf systems). The information and tile thicknesses specified in the ZDB information sheet "Ceramic floor coverings with high mechanical stress resistance", valid in Germany, must be observed.
Tiles in high-stress areas must be wholly embedded in the tile adhesive.
The impact of hard objects should be avoided on ceramic coverings. The tile dimensions should be at least 5 x 5 cm.
Based on the fleece fabric bond in the thin-bed mortar on the substrate, and through mechanical anchoring of the thin-bed mortar in the undercut stud structure, DITRA-HEAT creates a strong bond between the tile assembly and the substrate. This makes DITRA-HEAT suitable for wall and floor installation.
Always check that the substrates on which DITRA-HEAT is to be installed are level, load bearing, clean and compatible with the materials to be used. Remove any surface components that could weaken the bond. Any levelling, height adjustment or slope compensation must be carried out before installing DITRA-HEAT.
To guarantee effective floor heating, heat insulation is required, especially for installations adjoining soil or unheated spaces.
For a faster heat-up response on unheated screed assemblies, we recommend using DITRA-HEAT-DUO for its thermal separation function or Schlüter-KERDI-BOARD as an insulation layer (see data sheet 12.1).
Concrete is prone to long-term structural deformation due to shrinkage. In addition, deflection in concrete and pre-stressed concrete can cause tensions to occur.
Since DITRA-HEAT absorbs the resulting stresses between the concrete and the tile covering, tiles can be immediately installed as soon as the concrete is ready to bear weight.
In accordance with the applicable regulations, cement screeds must have cured for a minimum of 28 days prior to tile installation and have a moisture content below 2 CM %.
Floating and heated screeds have a particular tendency to buckle and crack even later, e.g. due to mechanical stresses and temperature fluctuations. With DITRA-HEAT, tiles can be installed on green cement screeds as soon as they are ready to bear weight.
DITRA-HEAT will neutralise cracks and screed deformations developing later and will prevent them from affecting the tile covering.
Under the applicable regulations, calcium sulphate (anhydrite) screeds may have a maximum residual moisture level of 0.5 CM% at the time of tile laying. In contrast, tile installation is permissible from a residual moisture level of 2 CM % with DITRA-HEAT.
If necessary, the screed surface should be treated (grinding, priming) as specified by the technical regulations and manufacturer instructions. DITRA-HEAT can be installed with dry-setting or other suitable thin-bed tile adhesives. DITRA-HEAT protects the screed surface against permeating moisture. Because gypsum based screeds are susceptible to moisture, screeds must be protected against humidity, e.g. moisture seepage on the underside.
DITRA-HEAT can be used on heated screeds, provided the above notes (cement, gypsum based screeds) are followed. Covering assemblies created with DITRA-HEAT are ready for heating only 7 days after completion. Starting from a temperature of 25 degrees C, the supply temperature can be increased by no more than 5 degrees C a day to a maximum of 40 degrees C.
Note: Installing DITRA-HEAT over heated screeds makes it possible to operate an individual, partial heating system that is independent of the central heating system. This allows for completely turning off the central heating system during seasonal transition times.
DITRA-HEAT assemblies can also cover peak loads.
(Due to the thermal separation properties of the product, DITRA-HEAT-DUO should not be installed over heated screeds.)
All surfaces must be load bearing and pre-treated or suitable for bonding with an appropriate adhesive, in which the DITRA-HEAT anchoring fleece can be embedded. The compatibility of the adhesive with the substrate and with DITRA-HEAT must be verified in advance.
These materials undergo significant deformation based on the influence of moisture (or through fluctuations in humidity). Therefore, chipboard and compressed wood panels with special water-repellent treatment to protect against moisture must be used.
These panels can generally be used as a substrate for floors and walls in interior spaces.
However, they have to be thick enough to be sufficiently stable in conjunction with a suitable support assembly.
They should be secured with screws placed suitably close together. Joints should be of a tongue-and-groove type and must be bonded with adhesive. Edge joints of about 10 mm should be maintained to adjacent structural elements.
DITRA-HEAT neutralises any tensions with the tile covering and also prevents permeating moisture.
In principle, ceramic coverings can be installed on sufficiently weight bearing hardwood floors with tongue and groove connections. The wooden substrate should have balanced moisture levels before DITRA-HEAT can be installed.
It has proven beneficial here to lay an additional layer of chipboard or compressed wood panels. Uneven floor surfaces should be levelled with suitable measures beforehand.
Masonry or mixed substrates
Masonry structures built with bricks, sand lime bricks, cement blocks, aerated concrete or similar materials are generally a suitable substrate for DITRA-HEAT. The substrate must be levelled in advance.
In restoration and remodeling projects, substrates frequently consist of different materials (mixed masonry), which have a tendency to crack at the interfaces with other materials due to different deformation rates. DITRA-HEAT protects the tile covering from the resulting tensions and cracks.
Gypsum substrates should be completely dry in accordance with the relevant regulations. The surfaces may need to be pre-treated with a primer. DITRA-HEAT can be installed with dry-setting or other suitable thin-bed tile adhesives.
Note: The thin-bed mortar and the coverings used in conjunction with DITRA-HEAT must be suitable for the respective application area and meet the corresponding requirements. Wait at least 7 days after completing the covering assembly to heat up the DITRA-HEAT-E system for the first time.
Non-ceramic coverings such as wooden parquet, vinyl, PVC coverings etc. may be installed over DITRA-HEAT, both as floating coverings, including sound insulation, or as directly adhered coverings. The maximum thermal conductivity resistance of the upper floor covering, including a possible impact sound insulation, of Rlmax = 0.15 m² K/W should not be exceeded. The manufacturer instructions for the corresponding covering must be observed.
Please consult our Technical Department before using non-ceramic coverings in conjunction with DITRA-HEAT.
Note:
Set the digital thermostats Schlüter-DITRA-HEAT-E to "Soft floor" to limit the maximum floor sensor temperature to 28°C. If the manufacturer of the respective upper floor covering specifies different temperatures, these must be reflected in the settings.
To mark the heated wall space (and avoid inadvertent drilling into a heating cable), we recommend using Schlüter profiles to visually outline the corresponding area (for more details, see data sheet 6.4 on page 4, see Downloads).
In the case of heated wall areas exceeding a length of 3 m, the wall and connection joints must have a permanently elastic design to accommodate thermal expansion.
DITRA-HEAT can be used to create certified waterproofing assemblies with tile coverings, provided the abutting membrane joints and the connections to installed components and upright building structures are carefully sealed.
DITRA-HEAT also features the national technical approval (abP) required in Germany and has an Ü-mark quality seal for construction products.
Moisture load class according to abP: 0 - B0 and A.
DITRA-HEAT has a European Technical Assessment (ETA) in accordance with ETAG 022 (watertight covering kits) and bears a CE mark.
Moisture load class according to ETAG 022: A.
Where work must be CE-compliant or in accordance with the certificate of technical approval (abP), only system-certified thin-bed mortar should be used.
For further information about thin-bed mortars and the corresponding technical approval certificates, please contact us at the address provided on this data sheet.
DITRA-HEAT protects the substrate from damage caused by permeating moisture and aggressive substances. To join the mats, trowel Schlüter-KERDI-COLL-L sealing adhesive over the abutting joints and cover them completely with Schlüter-KERDI-KEBA seaming tape in a minimum width of 12.5 cm.
To waterproof floor-wall transitions, adhere KERDI-KEBA over DITRA-HEAT on the floor and directly on the substrate in wall areas in the corresponding width. The sealing tape must have an overlap of at least 5 cm. KERDI-KEBA can also be used to create functional connections to fixed structural components such as door and window frames made of metal, wood or plastic.
The first step is to apply Schlüter-KERDI-FIX to the adhesive surfaces of the structural elements. The remaining width is then adhered to DITRA-HEAT with KERDI-COLL-L.
The suitability of KERDI-FIX for the respective materials of the structural elements must be verified in advance. Separate DITRA-HEAT at existing movement joints or expansion joints and seal the abutting joints with Schlüter-KERDI-FLEX. Never run heating cables over expansion joints or dummy joints.
KERDI-FLEX should also be used for flexible edge finishes. KERDI-KEBA can also be used here as an alternative, by forming an appropriate loop.
Note regarding floor drains:
Schlüter-KERDI-DRAIN and Schlüter-KERDI-LINE are drainage systems specially designed for connection to bonded waterproofing assemblies. DITRA-HEAT can easily and quickly be combined with these components by using pre-fabricated KERDI collars.
Thermostat:
The heating cables of the DITRA-HEAT system may only be operated with DITRA-HEAT-E thermostats.
Schlüter-DITRA-HEAT is a polypropylene membrane with a cut back stud structure and imprinted EasyCut gridlines. An anchoring fleece is bonded to the rear side. The product thickness, including the stud structure, is approx. 5.5 mm.
Polypropylene is not UV-stable in the long term; the product should not be stored in places with prolonged exposure to direct sunlight.
DITRA-HEAT is non-rotting, waterproof, stretchable and crack-bridging. In addition, it is largely resistant to the effects of aqueous solutions, salts, acids and alkalis, many organic solvents, alcohols and oils. Product resistance to special local conditions must be verified separately based on the anticipated concentration, temperature and length of exposure. DITRA has a relatively high level of sealing against water vapour diffusion. The material is physiologically harmless.
In applications exposed to chemical or mechanical stresses, the suitability of the profile must be verified on a case-by-case basis. The information provided below is intended as a general guideline.
Depending on the system, stepping on coverings installed over DITRA-HEAT with hard shoes or tapping them with a hard object may produce a hollow sound.
The use of DITRA-HEAT in conjunction with heating cables as a floor/wall heating system is only permitted for interior areas.
The thin-bed tile adhesive and the covering material used in conjunction with DITRA-HEAT must be suitable for the respective application area and meet the corresponding requirements.
If the covering materials to be installed are sensitive to moisture (e.g. natural stone or agglomerate stone pavers) or if moisture is present on the underside (e.g. from green screeds), the abutting joints of DITRA-HEAT mats should be fully covered with the sealing adhesive Schlüter-KERDI-COLL-L, and completely covered with the sealing tape Schlüter-KERDI-KEBA with a minimum width of 12.5 cm.
The use of quick-curing cementitious tile adhesives may be an advantage for certain projects. It is recommended to set out running boards to protect DITRA-HEAT from mechanical stresses caused by material transport.
Separate the DITRA-HEAT membrane over existing movement joints. Never run heating cables over movement joints. Movement joints should be incorporated into the tile covering as governed by the applicable regulations. Otherwise, divide large coverings installed over DITRA-HEAT into sections, using movement joints according to the applicable regulations.
We recommend using the various profile types of the Schlüter-DILEX family. Arrange profiles such as Schlüter-DILEX-BT or Schlüter-DILEX-KSBT over existing expansion joints depending on the anticipated structural movements.
It is important to prevent any clamping at the edges of the covering, e.g. near upright structural components or at floor-wall transitions. Edge joints and connection joints must comply with the applicable technical regulations and be sufficiently dimensioned to ensure that clamping cannot occur. We recommend using the various profile types of the DILEX family.
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