Wet Ufh Suspended Timber Floor

[Tile seller]

This floor has wet heating installed in the cement between the joists.

What would be the best way to tile over a floor like this bearing in mind height needs to be kept to a minimum.

Normally Id just suggest over boarding it but, all the products I know act as an insulator which isn't whats needed with this.

 

[J Sid]

Ditra-25 uncoupling membrane if floor is solid with expansion joints round perimeter