Is anti-crack matting necessary under 1.2m x 0.6m porcelain tiles?

[Tanny]

Hello, I have no one to ask so I'm hoping someone can help a me out. I have wet underfloor heating throughout my groundfloor 100sqm. Celotex underneath, then the heating pipes then it was screeded. It was dry screed (think that's what you call it - it wasn't liquid). I have chosen 1.2m x 0.6m tiles. The tile supplier said to lay anti crack matting under the tiles however, the two tilers I've spoken to have said no so long as there's no gaps in the adhesive it should be fine. What should I do? Use anti crack matting or not?

 

[jj4091]

Follow the suppliers advice they will be responsible for any warranty.

 

[Tanny]

The tiler suppliers don't offer any warrenty and like any supplier, just push any and all products in my opinion. I was hoping tilers would know better but in my area, they seem to want a quick buck and avoid genuine care.