Junction Layer DITRA 25 1m Wide Roll
Junction Layer DITRA 25 is a polyethylene sheet with recessed square indentations, on the back side equipped with a fleece fabric.
Junction Layer DITRA 25 serves, in conjunction with tile coverings, as a waterproofing and vapor pressure equalization layer for back moisture and as a decoupling layer on problematic substrates. The substrate must be level and load-bearing. To bond DITRA 25, a suitable thin-bed mortar matching the substrate should be applied with a notched trowel, recommended 3 x 3 mm or 4 x 4 mm. DITRA 25 is fully bonded with the back fleece fabric, which mechanically anchors into the mortar. 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 DITRA 25, with the mortar anchoring into the recessed square indentations of the DITRA 25 mat.
Summary of functions
- Decoupling: DITRA 25 decouples the covering from the substrate, neutralizing stresses caused by different deformation behaviors. It also bridges substrate cracks and prevents them from transferring to the tile covering.
- Waterproofing: DITRA 25 is a waterproof polyethylene sheet 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. DITRA 25 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.
- According to ETAG 022, DITRA 25 also has a European Technical Assessment (ETA) and is CE marked. Moisture exposure classes ETAG 022 A and C.
For areas where CE conformity or compliance with the abP general building authority approval is required, only system-tested thin-bed mortars should be used. These mortars and their approval documents can be requested at the address provided in this data sheet.
DITRA 25 protects the substructure from damage caused by moisture ingress and aggressive substances.
Vapor Pressure Equalization
DITRA 25 allows vapor pressure equalization through the open air channels on the underside in the ribbed areas, accommodating back moisture influence.
Load Distribution
Tile coverings installed on DITRA 25 in floor areas should be at least 5 x 5 cm in size and have a minimum thickness of 55 mm. DITRA 25 transmits traffic loads directly into the substrate via the mortar-filled square indentations. Therefore, tile coverings on DITRA 25 are highly loadable. In high-traffic areas, e.g., commercial zones, tiles must have sufficient thickness and stability for the specific application. The guidelines and tile thicknesses according to the currently valid ZDB leaflet "Mechanically Highly Loadable Ceramic Floor Coverings" must be observed.
In heavily loaded areas, tiles must be fully embedded. It should be considered that the contact area of DITRA 25 covers approximately 50% of the total surface, which may reduce the pressure resistance under high point loads. Impact loads with hard objects should be avoided on ceramic coverings.
Adhesive Bond
DITRA 25 achieves a good bond through the anchoring of the fleece fabric with thin-bed mortar to the substrate and the mechanical anchoring of the mortar into the recessed indentations (approx. 0.2 Nm²). It can thus be used for wall and floor applications. For wall coverings, additional anchoring dowels can be installed if needed.
Important Note: Individual sections are excluded from exchange or return.
- Item weight: 0,63 kg
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