Failed Floor

[Tile seller]

As ply shrinks and expans a flexible adhesive may well have stayed stuck to the wood and in good condition however,the forces this transfered to the tile perhaps could have debonded what was a weaker attachment.
Ply expands and can handle it, adhesive goes with it and can handle it also, the tile doesn't expand which creates the stress.
Or, maybe my imagination has gone funny lol

 

[J Sid]

You guy's not come across this ufh method before?
I would have uncouple on top of chipboard if floor solid, did a bathroom and a shower room yesterday, not plied, but have seen it done many times. HB would have insulated to much, no? If it was to fail I would have expected sooner the 2 years.
To me clearly a heat issue.

 

[radim]

 

[radim]

 

[radim]

Thank for your replies guys.
All tiles come up clean like new...
Builder is paying the bill but wants to know where is a problem.
I will be using hardie but if it is heat related than it can surely happen again?

 

[J Sid]

Turn ufh up to max and leave for a day, measure the floor surface temperature. Have to check, but the max allowed is about 28 Deg over the whole floor with a max of 35 degrees over a max of 1m2 (wetroom floor as an example).
Need to find out what happened before you fix again....
I would use Ditra rather than HB

 

[On one]

Any sign of back skimming of the tiles?

 

[radim]

no sign of back skimming ....

 

[WetSaw]

Was the ply primed? Looks like the adhesive sucked into that before it stuck to the tiles.

 

[kevsalt]

ribbs in the addy are still visible ...looks like minimum contact to the tile is a poss cause