Premium travatine on retro-fit ufh

[Midlandceramics]

This is a retro fit ufh which lays on exsisting sub floor ! Becouse it's a refurb and they don't want sub floor up ! Height is a prob for builder for what goes on top ! Prob for me is I only do things properly ! The floor suppliers tech say just to put 10mm ply on top and screw. I wouldn't use less than 15mm min and screw 300mm! I've done plenty of ufh wet and elec ! But first time on retro ! And with it being travatine . There's some weight on it ! I read the spec through on there website and it read for a lightweight covering , ie. carpet, laminate. Lino ! But does read somewhere in it about tiles can be used ceramic , porcelain and slate !! It has a 10% compression ? And operates at 60 degrees ! I've never had any problems with wet underfloor heating but it has always been in the screed ! Has anyone used this retro fit , speed -fit .and what did they use to go over the pipe mats which are a thermal composite 15mm with a alli covering which the pipes are laid into it's recess

 

[beanz]

I'd speak to your adhesive manufacturer personally.. How are you supposed to be screwing this ply down!?!

 

[Lee@emctiles]

Is the the Polypipe Light System?

 

[Midlandceramics]

Into the concrete sub floor !! Screw and plug !

- - - Updated - - -

Yeh

 

[Lee@emctiles]

Had this quite a few times, lost of tiles have probably been fixed directly onto this polypipe light system (as instructed by Polypipe)

Last time i checked with Weber/Bal ect (going back a year or so now) it was still a grey area.

Wonder if you called Polypipe what they advise now?

 

[Lee@emctiles]

Come to think of it, last one we did we had speccd by weber, 6mm NMP boards with 2 part adhesive.

 

[Midlandceramics]

?

 

[Gazzer]

NMP over poly pipe ???? Wouldnt that keep the heat below the NMP ?

 

[Midlandceramics]

The system is speed fit ufh over-fit retro

 

[Lee@emctiles]

This system? Installing the JG Overfit System - YouTube

"Intended to be used for lightweight flooring"

 

[Lee@emctiles]

NMP over poly pipe ???? Wouldnt that keep the heat below the NMP ?

Its one of those balancing acts Neale, you need the rigidity of the NMP over these panels, the option Weber gave to the fixer was NMP or Floorflex.......both will do the same.

 

[Midlandceramics]

Yes need the rigidity but surely as well the heat needs to come through and the celotex type stuff underneath needs to be fixed down well with no movement

 

[Midlandceramics]

Thanks

 

[Lee@emctiles]

44m2 + Trav on top.......Walk.

That's my advice.

 

[Time's Ran Out]

Putting ply over heating pipes is asking for movement!

 

[Midlandceramics]

Yep ! Not at all happy in doing it ,never tiled a ply or board over the heating,only under it . this is there spec not mine ! Ideally I would prima grip bond the heating panal and fibre slc on top ! Poss ditra on that ! But this celotex type panal needs to be fixed securely to the concrete sub floor with no movement at all