This is the key to preventing the transmission of the movement that is the main cause of cracking in tile floors. It is mortared to the DITRA underlayment, which in turn, is mortared to the subfloor. With the flexible layer of DITRA installed, the tile isn’t adhered to the substrate. In short, the material neutralizes the movement like automobile shock absorbers. When the substrate moves – and it will in every flooring installation-the DITRA material flexes with it to prevent the movement from transferring through and causing the tile and grout to crack. Schluter-DITRA membrane reduces cracking by absorbing the stresses created when the substrate beneath it moves due to shifting, expanding or contracting. And an anchoring fleece laminated to its underside: The fleece backing adheres to a subfloor such as concrete or wood using thin-set mortar.Because it doesn’t adhere to the Ditra surface, the matting can move with expansion and contraction of the subfloor without transferring that movement to the tile and the grout and causing cracks. Each DITRA square cavity is shaped like such a box, so the cured thin-set mortar becomes anchored within the cavity, though it doesn’t “stick” to the plastic matting. If you filled the box with mortar and let it cure, you couldn’t simply pull out the block of mortar because its base would be larger than the top. Each cut back in a dovetail configuration: Picture a box in which the floor of the box has a length and width greater than the top, requiring that the sides be slanted outward.With a grid structure of square cavities: These cavities are filled with thin-set mortar that produces a mechanical bond between the mortar and the tile.The Schluter-DITRA matting is a flexible, waterproof form of it. A polyethylene membrane: Polyethylene is the most common plastic available.Now, let’s break down this definition into its parts: “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. By the way, contractors sometimes refer to this product simply as DITRA, and we will too.Īccording to Schluter, their DITRA matting is The key to understanding why this membrane will greatly enhance the structural integrity and durability of your tile floor is to get a good handle on just what Schluter-DITRA is. The result of Schluter-DITRA’s performance is a tile floor with outstanding durability and resistance to cracks and moisture. This underlayment also acts as a waterproof membrane over moisture-sensitive subflooring such as plywood and OSB.
DITRA is also noted for its ease of use when compared with materials like cement backer board. Schluter-DITRA matting is used by professional tile installers to prevent the cracking of tile and grout caused by movement substrate, the foundational material beneath the tile.
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