Schluter Systems Ditra Ceramic Tile Underlayment by Sq Foot

Ditra Ceramic Tile Underlayment by Sq Foot by Schluter Systems

This product has been replaced by the following product:

Prova Flex Tile Underlayment per SF

Prova Flex Tile Underlayment / Crack Isolation Membrane - by the square foot

A complete, easy to install


39.5" Wide - Sold by the Square Foot

This membrane may be used with modified or unmodified thinset.


View Replacement Product Details

Schluter Ditra Ceramic Tile Underlayment - Crack Isolating Uncoupling Waterproof Membrane By the Square Foot

  • Sold by the Square Foot.
  • Replaces the need for cement board.
  • A lightweight, thin, uncoupler and waterproofing underlayment.
  • Ditra offers no loss of vertical strength for building upon.
  • The product is 3.29 ft or 39.5" wide for calculating square footage.

  • Consider an alternative product

    Schluter Systems Ditra Ceramic Tile Underlayment by the Square Foot

    Ditra Roll

    Not sold by Linear Foot (LF) - sold only by square foot (SF). Material is 3.3 SF wide. To get 1 LF of material, you would need to order 3.3 SF - round up to 4

    • Allows independent movement between the sub floor and the finished surface.
    • Protects the sub floor from moisture penetration.
    • Replaces second layer of plywood for ceramic tile installation.
    • Exclusively designed for ceramic and stone tile surfaces.
    • Neutralizes stress between sub floor and tile surface, eliminating the main cause of cracking.
    • Waterproofs and allows moisture in the substrate to evaporate.
    • Apply over single layer 5/8" plywood, with 16" on-center joist spacing, with tongue-and-groove plywood.
    • Apply over OSB.
    • Apply over concrete even concrete that has cured less than 28 days.
    • Apply over cracked concrete.
    • Apply over damp basement floors.
    • Ideal for interior and exterior tile and stone installations



    Ceramic and stone tiles are durable, easy to maintain, and hygienic, representing the ideal surface coverings. However, today's lightweight construction methods can make the installation of hard surface coverings particularly challenging. In order to protect the integrity of the tile assembly, an underlayment that performs multiple functions is required.

    Schluter-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. Schluter-DITRA is bonded to the substrate using thin-set mortar. The anchoring fleece on the underside of Schluter-DITRA is fully engaged in the mortar to provide a mechanical bond to the substrate. Tile is installed over Schluter-DITRA using the thin-bed method in such a way that the mortar becomes mechanically anchored in the square, cutback cavities of the Schluter-DITRA matting.

    Designed specifically for ceramic tile and dimension stone installations, Schluter-DITRA serves as an uncoupling layer, waterproofing membrane, and vapor management layer that accommodates moisture from beneath the tile covering. Further, DITRA performs all these functions while still providing adequate support/load distribution for the tile covering:


    Tile 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.

    Vapor management

    The 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.


    Schluter-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

    When placed on a solid foundation, columns or pillars can support tremendous loads. The same physical principle applies to Schluter-DITRA 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 is virtually incompressible within the tile assembly, the advantages of uncoupling are achieved without sacrificing point load distribution capabilities. The ability of DITRA installations to support and distribute heavy loads while preserving the integrity of the tiled surface has been verified through extensive laboratory and field testing, including applications exposed to vehicular traffic.

    Customer Reviews and Ratings

    Would not recommend

    Review by AJ

    Submitted on Feb 17, 2016

    Verified Buyer

    Would not recommend this product. Extremely difficult to install over cement board. It simply would not stick to it. I have returned the used stuff back to the vendor they took it back no questions asked and they told me about people having hard time installing it over cement/concrete.

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