Floor Tiles Lifting

[Ajax123]

He’s not primed the floor prior to using a cement based adhesive. This will cause the reaction you’ve had as the high gypsum content in the screed reacts with cement. priming acts as a barrier between the 2
I use ultra csa (calcium based adhesive) you don’t need to prime with this although I stil give it a 1.3 ratio mix. Then turn the heating on
Keep to sub 15 degrees while tiling. Then after 7 days creep up by 2 degrees per day to desired temp. Doing it like that helps with grout shrinkage. As opposed to starting heating a couple of weeks after floor has been layed

We dont even know if its anhydrite screed yet.
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It wasn’t commissioned first , only after tiling.

The

We dont even know if its anhydrite screed yet.

Sorry missed a post...
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There seems to have been a number of fundamental errors here. Heating possibly not commissioned before tiling, no moisture test, possibly not primed correctly, possibly inappropriate adhesive. All of these are really down to the tiler in the respect that he should ask the questions and not deem the floor ready until he is satisfied with the answers.

The use or not of Ditra is technically not relevant. It may be commercially relevant though if it was specified and he included it in his quote.

 

[Deleted member 54058]

It wasn’t commissioned first , only after tiling.

Thanks. Would you lay 600x600 floor tiles (75M2) WITHOUT Matting?

 

[Albert]

Thanks. Would you lay 600x600 floor tiles (75M2) WITHOUT Matting?

Yes

 

[Ajax123]

Thanks. Would you lay 600x600 floor tiles (75M2) WITHOUT Matting?

provided they were not natural stone ten no reason why not. it is not essential although it is not harmful and can offer benefits.