Schluter-DITRA

DITRA is specifically designed as an uncoupling membrane for ceramic and stone tile installations. Engineered to provide the essential functions for a successful, durable installation, DITRA provides four key roles: uncoupling, waterproofing, vapor management, and support for heavy loads. Combined, these functions protect the integrity of tile installations, preventing tiles from chipping and cracking.

DITRA 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. DITRA can be applied over various substrates, including plywood, OSB, concrete, and electric heat. Since its introduction in 1987, DITRA has evolved to become a standard within the tile industry, and is recognized by the TCNA Handbook for Ceramic, Glass, and Stone Tile Installation.

Four Functions

Uncoupling

UncouplingTile has been successfully installed for thousands of years by incorporating an uncoupling layer, or forgiving shear interface, within the tile assembly. Schluter®-DITRA 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.

Waterproofing

WaterproofingSchluter®-DITRA 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.

Support/Load Distribution

Support/Load DistributionWhen placed on a solid foundation, columns or pillars can support tremendous loads. The same physical principle applies to Schluter®-DITRA installations. Column-like 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.

Vapor Management

Vapor ManagementThe distinguishing feature of Schluter®-DITRA 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 effectively manages moisture beneath the tile covering.

Handbook

To download the latest version of the Schluter-DITRA Installation Handbook click here.