Schlüter-DITRA-HEAT-DUO-PS  Pressure sensitive adhesive variant of DITRA-HEAT-DUO

Our special uncoupling mat Schlüter-DITRA-HEAT-DUO-PS is an intelligent system solution for uncoupling and heating your tile coverings if you need heat quickly and a for a short time and a suitable substrate is already installed. It not only offers all the advantages of DITRA-HEAT-DUO (quicker heat-up response and additional sound insulation), but also saves time and material in installation with its pressure sensitive adhesive laminated to the underside.


  • Peel & stick
Product image DITRA-HEAT-DUO-PS 1©Schlüter-Systems KG
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General product information

What this product does

Schlüter-DITRA-HEAT-DUO-PS is a polypropylene membrane with a cutback stud structure and a fleece covered in pressure sensitive adhesive laminated to the underside. It is a universal substrate for tile coverings that forms an uncoupling and vapour pressure equalisation layer and can also be used to attach the electrical heating cables Schlüter-DITRA-HEAT-E-HK and DITRA-HEAT-E-CHC.

DITRA-HEAT-DUO-PS features a special 2 mm fleece covered in pressure sensitive adhesive laminated to the underside, which, in addition to bonding with the substrate, reduces impact sound and causes a faster heat-up response.

DITRA-HEAT-DUO-PS is exclusively intended for installation on floors in interior areas. Substrates for installing DITRA-HEAT-DUO-PS must be flat, clean, dust free, dry, smooth, rigid and load bearing, with no deflection. To install peel the release film off DITRA-HEAT-DUO-PS and place the membrane on the substrate. It can be lifted and re-positioned providing no pressure has been applied to it. However once pressure has been applied the adhesive sticks the membrane firmly to the substrate. The heating cables can be installed immediately after adhering the membrane, using a spacing of 9 cm (every 3rd stud).

The tile covering is installed directly over DITRA-HEAT-DUO-PS in accordance with the applicable regulations, using the thin-bed method. The cementitious tile adhesive bonds with the cut back stud structure of the DITRA-HEAT-DUO-PS membrane.

DITRA-HEAT-DUO-PS is waterproof and suitable for use in wet areas, provided the abutting joints are sealed with Schlüter-KERDI-KEBA and Schlüter-KERDI-COLL-L. As DITRA-HEAT-DUO-PS is waterproof, and joints are waterproof when they are sealed with KERDI-KEBA and KERDI-COLL-L, it is suitable for use in a bathroom/wet room. But it does not have ETA or abP certification. If certification is required, we recommend using the original Schlüter-DITRA-HEAT/HEAT-DUO which is bonded to the substrate with cementitious tile adhesive.

 

Summary of functions

a) Uncoupling

DITRA-HEAT-DUO-PS 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.

b) Waterproofing

DITRA-HEAT-DUO-PS is a waterproof polypropylene membrane with a high water vapour diffusion seal. Unless a certified bonded waterproofing assembly is required, DITRA-HEAT-DUO-PS can serve as a waterproofing layer, provided the abutting membrane joints and the connections to installed components and upright building structures are carefully sealed.

DITRA-HEAT-DUO-PS protects the sub-structure from damage caused by permeating moisture or aggressive substances.

Note:
If a bonded waterproofing assembly with national technical approval (abP) or European approval (ETA = European Technical Assessment) is needed, choose the variants of DITRA-HEAT/-DUO for installation with cementitious tile adhesive that have the corresponding certification.

c) Load distribution (load induction)

Tiles installed over DITRA-HEAT-DUO-PS in floor areas should have a minimum size of 5 x 5 cm and a thickness of at least 5.5 mm. The adhesive-filled indentations of DITRA-HEAT-DUO-PS transfer mechanical stresses impacting the tile covering directly to the substrate. This makes tile coverings installed on DITRA-HEAT-DUO-PS especially durable.

DITRA-HEAT-DUO-PS is suitable for traffic loads of up to 3 kN/m². This includes residential and light commercial use (private homes, office and administrative spaces, restaurants, hotels, conference rooms, nursing stations and patient rooms etc.).

Dynamic impacts on ceramic coverings caused by hard objects should be avoided for assemblies built with DITRA-HEAT-DUO-PS.

d) Bonded assembly

The special adhesive layer on the underside anchoring fleece of DITRA-HEAT-DUO-PS adheres well to the substrate, while the mechanical anchoring of the thin-bed tile adhesive in the undercut stud structure results in an excellent bond with the tile covering. DITRA-HEAT-DUO-PS is exclusively intended for floor installation in interior areas.

e) Thermal separation

DITRA-HEAT-DUO-PS features a special 2 mm anchoring fleece on its underside, which enables a faster heat-up response.

f) Sound insulation

An impact sound improvement value (ΔLW) of 14 dB was measured (according to DIN EN ISO 10140) in fully installed DITRA-HEAT-DUO-PS assemblies.

The actual improvement offered by the respective assembly depends on the local conditions (structural design) and can deviate from this value. The measured test values therefore may not apply equally to every building situation.

 

Substrates for Schlüter-DITRA-HEAT-DUO-PS

Always check that the substrates on which DITRA-HEAT-DUO-PS is to be installed are level, load bearing, clean and compatible with the materials to be used. Remove all surface components that may weaken the bond. Any levelling, height adjustment or slope compensation must be carried out before installing DITRA-HEAT-DUO-PS.

To guarantee effective floor heating, heat insulation is required, especially for installations adjoining soil or unheated spaces. We recommend using DITRA-HEAT-DUO-PS for a faster heat-up response on unheated screed assemblies.

DITRA-HEAT-DUO-PS can only be installed on building components adjoining soil that have proper waterproofing to protect against rising moisture or water pressure. A functional horizontal barrier must be in place.

Concrete

Concrete undergoes long-term structural deformation due to shrinkage. In addition, tension can build up in concrete and pre-stressed concrete due to deflection.

Since DITRA-HEAT-DUO-PS absorbs the resulting tensions between the concrete and the tile covering, tiles can be installed about 28 days after pouring the concrete.

Cement screeds

Cement screeds must have cured for at least 28 days prior to tile installation in accordance with the applicable regulations 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-DUO-PS, tiles can be installed on fresh cement screeds as soon as their surface is sufficiently dry (typically this takes approx. 3-5 days for well ventilated standard cement screeds).

DITRA-HEAT-DUO-PS will neutralise cracks and screed deformations developing later and will prevent them from affecting the tile covering.

Gypsum based screed

According to the applicable regulations, calcium sulphate screeds (anhydrite) may not have a residual moisture level of more than 0.5 CM % at the time of tile installation. In contrast, tile installation is permissible from a residual moisture level of 2 CM % with DITRA-HEAT-DUO-PS.

If necessary, the screed surface must be treated (grinding, priming) as specified by the applicable technical regulations and manufacturer instructions. DITRA-HEAT-DUO-PS can then be adhered to the pre-treated screed surface. DITRA-HEAT-DUO-PS protects the screed surface against permeating moisture. Because gypsum based screeds are susceptible to moisture, the screed must be protected against humidity, e.g. moisture seepage on the underside.

Heated screeds

Due to the thermal separation properties of the product, DITRA-HEAT-DUO-PS is not recommended for installation over heated screeds.

Vinyl coverings and coatings

All surfaces must be load bearing and pre-treated or suitable for bonding with the adhesive anchoring fleece on the underside of DITRA-HEAT-DUO-PS. The compatibility of the adhesive with the substrate must be verified in advance. DITRA-HEAT-DUO-PS may only be installed on substrates that are free of solvents, plasticisers and oils.

Chipboard and compressed wood panels

These materials are especially prone to form changes when exposed to moisture (or heavily fluctuating humidity levels). It is therefore recommended to use chipboard and compressed wood panels with special water-repellent treatment to protect against moisture.

Such panels can generally be used as a floor substrate in interior spaces. However, they have to be thick enough to be sufficiently stable in conjunction with a suitable support assembly.

The structure should be fastened with closely spaced screws. Abutments must have a tongue and groove connection and be fully sealed. Perimeter movement joints of about 10 mm have to be maintained at the transition to upright building structures. DITRA-HEAT-DUO-PS neutralises any tensions with the tile covering and also prevents permeating moisture.

Hardwood floors

In principle, ceramic coverings can be installed on sufficiently weight bearing hardwood floors with tongue and groove connections. It has been proven beneficial to install an additional layer of chipboard or compressed wood panels. The wooden substrate should have balanced moisture levels before DITRA-HEAT-DUO-PS can be installed. Uneven floor surfaces should be levelled with suitable measures beforehand.