What to do and why

[TandS]

Hi I wonder if any one can shed some light on a problem I have I recently built a kitchen-extension and the client laid underfloor heating electric and tiled the floor in granite tiles him self he has just rung me to say the floor has move on inspection two rows of tiles have bellied up any ideas what the problem may be thanks Neal

 

[Ian]

Hello Neal, are the tiles definitely granite and not a quartz resin tile?

 

[TandS]

Not sure they are star galaxy

 

[Gazzer]

Sounds like the floor has moved ...ie shrunk as opposed to expanded hence the tiles "tenting" up.

 

[TandS]

They are star galaxy .

 

[Time's Ran Out]

As Bri and also what was the construction of the floor?

 

[TandS]

What is this due too

 

[Gazzer]

What is this due too

Really need to know more. What adhesive was used ?
What grout?
How big was the area?
Any expansion joints ?

 

[TandS]

It was timber joists with king span then moisture resistance tg 22mm floor boards he says he used 12mm ply screwed at 150mm gaps

 

[TandS]

He used a flexible powered adesive and grout it's about twenty sq metres only expantion on outside edgesunder kick boards

 

[Gazzer]

It was timber joists with king span then moisture resistance tg 22mm floor boards he says he used 12mm ply screwed at 150mm gaps

Adhesives etc?

 

[TandS]

It was a powered cement based flexible adhesive could it be due to the floor being too hot or being turn on too soon

 

[Gazzer]

It could be shock from the under floor heating but at the moment its all guess work....we need to know products used and in what order etc....as much detail as possible.
Was the heating on while tiling ?

 

[TandS]

No it wasn't but it was turned on the next day as far as I'm aware

 

[Concrete guy]

Was the heating commissioned before the tiles were fitted?