Help!: thermal boarding

[toshtiles11771]

hi fellow tilers
I've have a customer who wants his kitchen floor tiled in travertine, he also is wanting electric under tile heating ( there is an electrician lined up to fit it ) , It is timer floor so I will have to ply floor, he also has thermal boarding for added insulation .So my question is, do I ply the floor then tile onto the thermal board or do I lay thermal board first and tile onto ply ???
Many Thanks Sandy

[atec]

ply on timber, thermal board on ply. under tile heating on thermal board, are you covering the under tile heating with self leveling compound. if its electric you could damage the wires/mat with the trowel. All this will bring the hieght of the floor up.

[toshtiles11771]

Thanks
Customer has been told about added hieght, as new kitchen being fitted, told him to tell joiner to take aprox.40mm into his hieght calculations
I've not seen this type of electric heating before it's very thin (2mm). Was going to use plastic trowel to avoid cutting underfloor heating circuit. but may now rethink and put a self leveling compound down before tiling.

Thanks Again !!!

[whitebeam]

I would put ditra/durobase on top of the ufh after slc, Then the trav