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Old Mod
Build up over Ditra can't exceed 10mm including adhesive. They don't advocate using slc over it, but it's doable.Just throw this one in the mix...fix Dural or ditra onto screed using tm ultimate, leaving an inch clear round perimeter, tape joints, skim of rapid level 30 over Ci/ditra and fix heat mat same day, slc again over heat mat...good to go