Schlüter DITRA 25 D30M Bonding and Decoupling Membrane New Version

SchluttleiterregDITRA 25

SchluttleiterregDITRA 25 is a polyethylene membrane with interlocking square indentations, on the reverse side equipped with a fleece fabric.

SchluttleiterregDITRA 25 serves in conjunction with tile coverings as a sealing vapor pressure equalization layer against rear moisture and as a decoupling layer on problematic substrates. The substrate must be level and load-bearing. To bond SchluttleiterregDITRA 25, a primer mortar suitable for the substrate is applied with a notched trowel, recommended 3 x 3 mm or 4 x 4 mm. The SchluttleiterregDITRA 25 is then fully bonded with the fleece side into the mortar, with the fabric mechanically anchored in the adhesive. The open time of the adhesive must be observed.

The tile covering is installed according to applicable standards using the thin-bed method directly onto SchluttleiterregDITRA 25, with the mortar anchoring into the interlocking square indentations of the membrane.

Summary of functions

• Decoupling: SchluttleiterregDITRA 25 decouples the covering from the substrate, neutralizing stresses caused by different deformations. It also bridges stress cracks from the substrate and prevents them from transferring to the tile covering.
• Sealing: SchluttleiterregDITRA 25 is a waterproof polyethylene membrane with relatively high vapor diffusion resistance. When properly installed at joints, wall connections, and penetrations, a tested bonded waterproofing with the tile covering can be achieved. It holds a general building authority approval (abP) in Germany, marked with the CE symbol, with moisture exposure classes abP 0, B0, as well as A and C.
• SchluttleiterregDITRA 25 also has an ETA (European Technical Assessment) for bonded waterproofing according to ETAG 022, marked with the CE symbol, with moisture exposure classes ETAG 022 A and C.

Only system-verified thin-bed mortars should be used in areas where CE conformity or compliance with the abP general building authority approval is required. The mortar types and test certificates can be requested at the address provided in this data sheet.

SchluttleiterregDITRA 25 protects the substructure from damage caused by penetrating moisture and aggressive substances.

Vapor pressure equalization

SchluttleiterregDITRA 25 allows vapor pressure equalization through the open air channels on the underside of the ribs in case of rear moisture influence.

Load distribution and transfer

Tile coverings installed on SchluttleiterregDITRA 25 in floor areas should be at least 5 x 5 cm in size and have a minimum thickness of 55 mm. The membrane transmits traffic loads acting on the tile surface directly into the substrate via the mortar-filled square indentations. Therefore, tile coverings on SchluttleiterregDITRA 25 are highly loadable. In areas with high traffic, such as commercial zones, tiles must have sufficient thickness and stability for the specific application. The guidelines and tile thicknesses according to the German ZDB leaflet "Mechanically highly loadable ceramic floor coverings" must be observed.

In heavily loaded areas, tiles must be fully embedded. It should be noted that the contact area of SchluttleiterregDITRA 25 covers approximately 50% of the total surface, which may reduce the pressure resistance under high point loads. Hard object impacts should be avoided on ceramic coverings.

Adhesion bond

SchluttleiterregDITRA 25 ensures a good bond of the tile covering to the substrate through the anchoring of the fleece fabric with the thin-bed mortar and the mechanical anchoring of the mortar into the interlocking indentations (laboratory test values approx. 0.2 Nm²). It can thus be used for wall and floor applications. Additional reinforcement dowels can be installed in wall coverings if needed.

Important note: Individual sections are excluded from exchange or return.