underfloor heating in bathroom help please !!

[babyblog]

Hi
I'm a DIYer so forgive my question if it is obvious what i need to do here !!
Here goes with my issue. I am installing a new bathroom on a first floor level. I have a wooden floor. I will be putting down travetine tiles on the floor. I want to install a heating mat. So, i was planning on putting down and securing 6mm plywood over the floorboards -- then the heating mat on the ply -- then tiling directly onto the heating mat. can i do this ??
Alternatively, would i put down a thermal board, instead of ply or thermal board and ply -- then lay the heating mat -- then tile over.....i don't have much idea what i need to do....so any advice GREATLY appreciated !!!

 

[Stewart]

You need to eliminate all movement in the sub floor. Once you've done that then the insulation boards glued and screwed will give you a perfect floor to install your heat mat and tile...

 

[babyblog]

that's bang on....thanks for the advice...