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Old Mod
Please checkout the following advertisement.
I have read a lot of conflicting opinions on using S2 over Ditra. I decided to go with Ultimate S2 as I read US and UK specs are different and S2 is suitable according to UK spec.
I’m afraid you are mistaken. An S2 https://www.tilersforums.com/forums/tile-adhesive/ is NOT suitable if you follow schluters guideline.
They WILL NOT honour any guarantees.