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Hi. I have about 55 sqm floor, anhydrite screed laid about 5 years ago with water UFH. Because my house is old, build 1902 on side of the hill and on the clay, I have few crack on floor. One of the first shop where I was looking for tiles, wood effect which I want, was Topptiles. Because crack they offer me Durabase and, because UFH, own https://www.tilersforums.com/forums/tile-adhesive/ S2, so base on this suggestion I start my research on this forum, and I replaced Toptiles https://www.tilersforums.com/forums/tile-adhesive/ for Tilemaster Ultimate Flexible Rapi S2 and mat for Ditra. But before maked final order I was look again what U use to adhere Ditra mat to screed as mine and I could not find exactly the same situation but few other application suggests S2 https://www.tilersforums.com/forums/tile-adhesive/ could be wrong to use in this combination so what is Your suggestion what type and brand https://www.tilersforums.com/forums/tile-adhesive/ I should use ?