Prep for ensuite floor

R

Retroelec

Hi.
Need to tile ensuite floor in extension which has currently got new T&G floorboards down.
Am having underfloor heating, one of the Prowire kits from Topps which suggest you put down a thermal backing board (6 mm or 10mm) that they sell.
Could they be fixed straight on the floorboards?
Or would you suggest that I ply over the floorboards then fix these boards to that and if so what size ply should I go for?

Thanks
 
Argee with what mark frost says, As I believe topps sell warm up thermal boards (or did when I worked there) assuming the t&g floorboards are solid and well screwed down, using a 10mm thermal board there will be no need for ply,
 

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