Working out levels.. Anhydrite screed, mat, adhesive, porcelain tile

[Ajax123]

Thanks Alan

So if I go for a uncoupling mat such as Ditra25, I understand this would be 3mm thick.
How thick would the adhesive be between the mat and the screed? And the mat and the tile?

Just trying to work out total cross section height to finished floor level.

Just

If you use a 10mm notch trowel the adhesive will press down to about 3 or 4mm as it fills the dimples in the matting. Not sure if the minimum depth is less but the tech department of the selected adhesive manufacturers will be able to confirm

 

[Dave]

Thanks Alan

So if I go for a uncoupling mat such as Ditra25, I understand this would be 3mm thick.
How thick would the adhesive be between the mat and the screed? And the mat and the tile?

Just trying to work out total cross section height to finished floor level.

Just

Very thin as you want full contact. So quite negligible tbh.

 

[TimmoF]

A third alternative is BAL flexbone loose lay uncoupling mat which eliminates all prep as you dont stick it down. A bit more expensive but a lot less work.

I've always wondered about using Flexbone with UFH.
As it's not adhered to the substrate the thermal conductivity must be lower?

 

[Ajax123]

No rule that says things have to be stuck down to heated screeds. Every time you add a layer you redcue the efficiency so eliminating a layer of adhesive would counteract the fact the membrane is not stuck down. I doubt you would notice the difference TBH.