Help!: Tiling Floating Floor over Wet Underfloor Heating

[AndyH747]

Hi All,

Just reached water tight on our new house and starting the insides. The first floor has our master bedroom with ensuite. The floor is constructed of 18mm Caberdeck glued and nailed onto Posi Joists. On top is laid the Nu-Heat wet underfloor heating system consisting of 25mm polystyrene panels with metal diffuser plates laid into pre formed grooves in the polystyrene. The underfloor heating pipes are then laid into the metal heat deflector plates. We're ready to install 18mm T&G flooring on top of that making the first floor a floating floor. However I'm now concerned about how I'm going to tile the ensuite! All advice says don't tile on a floating floor so how do I tile on top of the Nu-Heat installation on this floor?

Advice greatly appreciated.

[Dave]

Can you not fix directly through into the joists to get a fix..?

[doug boardley]

how are you going to fix your T & G?

[AndyH747]

The T&G isn't fixed, it's a floating floor glued together and sits directly on top of the Nu-Heat setup - no fixings required.

I could screw through to the lower deck and possibly into the joists but would this be sufficient to stabilise the floor against deflection? Would you recommend using ply for this area or can I stick with the water resistant 18mm T&G? What thickness of ply would you advise given that I don't want the levels in the ensuite to be too far out from the other rooms?

Thanks for the replies.

[wetdec]

Providing the ufh setup leaves a flat surface then 22mm ply screwed through should be good.

..

[AndyH747]

Thanks for that. Surface is very flat so will go for 22mm ply screwed through, avoiding pipes of course!