Relaying lifted tiles on suspended floor (water UFH)

[Rosewood]

Ok thanks - I understand. If I can find out any more about whats under the ply then I'll come back to you.

 

[Rosewood]

I spoke too soon! I've just looked at the plans for the house and assuming that they were followed this is what they say about the floor construction:

"147*47mm treated timber floor joists at 400mm centres; 9mm stirling board on joists with 50*38mm timber battens on top of the joists, underfloor heating pipes with semi-dry cement mix over the same laid between joists; 18mm T&G chipboard moisture resistant chipboard flooring"

Hopefully that makes sense to some of you! I can see a small section of floor untiled and the floor is definitely ply not chipboard, so it does seem that the above was not followed exactly, but I think it reasonable to assume this is the floor construction.

Thanks

 

[Rosewood]

Hi. Any final thoughts given the above floor construction?

To overlay or not?
If so with ply or hardiebacker or something else - to minimise resistance to heat transfer from UFH?

Thanks