Upstairs ensuite bathroom with electric underfloor

[Jaykaybee22]

Hello there,
Can you please give me some advice to a novice?
In my new extension I have a small ensuite bath/shower room (upstairs) currently with a chipboard floor - floor size about 1.5msq.
I have bought a diy undefloor heating mat.
I would like to use natural travertine floor tiles.
Please can you advise what I need to lay in what order?
eg.
Chipboard
Some sort of ply(???)
Primer
Heating mat
Some sort of screed?
Flexible tile adhesive
Travertine tiles....

Also I am worried with all these layers there will be a difference between the carpet and the bathroom floor surfaces of about an inch?!!! How does one get over this?

Thanks for your expertise!
Jenna

 

[nybor62]

to get over height probs , you can remove chip board floor, and in its place fix 15mm wbp ply ,then over board with 6mm cement board , lay heating mat then self leveler over the top, fix tiles with single part flex white adhesive, flexi grout , hope this makes sense, there are other variations in which way it could be done and maybe one of the lads will add to this later

 

[Jaykaybee22]

Thanks for your help!
Bit worried about taking up the chipboard floor... can I just leave it and put the cement board over the top?

 

[nybor62]

yes but the floor needs to be deflection free i would go for min 10mm cement board glued and screwed
by deflection free i mean no bounce in the floor at all