Schluter-DITRA-XL is manufactured using high-density polyethylene (HDPE), which does not rot and is highly resistant to solutions containing salts, acids, and alkalis, as well as many organic solvents, alcohols, and oils.  Schluter-DITRA-XL is waterproof and resists the transmission of vapor. The material is inert, non-toxic, and physiologically safe.





Ceramic, Porcelain and stone tiles are extremely durable, easy to maintain,  hygienic, and representative of the ideal surface covering. However, today’s lightweight construction methods can make the installation of hard surface coverings particularly challenging, this is where the benefit of Ditra-Xl as an underlayment comes in handy. In order to protect the integrity of the tile assembly, an underlayment that performs multiple functions is required. Schluter-DITRA-XL is a polyethylene membrane with a grid structure of square cavities, each cut back in a dovetail configuration, and an anchoring fleece laminated to its underside. Schluter-DITRA is able to be bonded to the substrate using thinset mortar. The anchoring fleece that is found on the underside of the Schluter-DITRA-XL is engaged in the mortar to provide a mechanical bond to the substrate. The tile is then installed over the Schluter-DITRA-XL using a thinset in such a way that the thinset becomes anchored in the squares and cavities that are found in the Schluter-DITRA-XL matting. Schluter-DITRA-XL is designed specifically for ceramic tile, porcelain tile, and stone tile installation and serves as a waterproofing membrane, uncoupling layer, and a vapor management layer that can be used to accommodate moisture that can be found beneath the tile covering.  One of the benefits of Schluter-DITRA-XL is that it performs all of these functions while still providing adequate load distribution and support for the tile covering.

a) Uncoupling Tile has been successfully installed for thousands of years by incorporating an uncoupling layer, or forgiving shear interface, within the tile assembly. Schluter-DITRA-XL provides uncoupling through its open rib structure, 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.

b) Waterproofing Schluter-DITRA-XL provides reliable waterproofing in interior and exterior applications. Its polyethylene composition protects the substrate from moisture penetration, which is particularly important in today’s building environment where most substrates are moisture sensitive.

c) Vapor management The distinguishing feature of Schluter-DITRA-XL is the existence of free space created by the configured channels on the underside of the matting. The free space provides a route for excess moisture and vapor to escape from the substrate that could otherwise cause damage to the tile layer above. Thus, DITRA-XL effectively manages moisture beneath the tile covering.

d) Support/load distribution When placed on a solid foundation, columns or pillars can support tremendous loads. The same physical principle applies to Schluter-DITRA-XL installations. Columnlike mortar structures are formed in the cutback cavities of the matting. Loads are transferred from the tile covering through these column-like mortar structures to the substrate. Since DITRA-XL is virtually incompressible within the tile assembly, the advantages of uncoupling are achieved without sacrificing point load distribution capabilities. The ability of DITRA-XL installations to support and distribute heavy loads while preserving the integrity of the tiled surface has been verified through extensive laboratory and field testing.

Item No.




5/16” – 7 mm

3’ 3” x 53’ 3” = 175sf