Schluter® DITRA MAT Polyethylene uncoupling membrane with a grid structure of square cutback cavities and an anchoring fleece laminated to the underside. DITRA provides uncoupling through the 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. In conjunction with tile covering, DITRA forms an uncoupling, waterproofing, and vapor management layer, while providing support/load distribution. Is 1/8" (3mm) thick, which minimizes tile assembly thickness and reduces transitions to lower surface coverings (eg. Carpet, engineered wood, and vinyl). DITRA allows for ceramic tile application over single-layer plywood or OSB subfloors on joists spaced up to 19.2" (488mm).