Have just tiled a floor for a friend of mine but about 15 tiles have started poping off. it is a 20meter kitchen floor . i belive it is joists over laid with chipboard and 6 mil ply fixed with nails. i used bal flexi floor adhesive (green bags) the adhesive did not skin over and tiles seemed to bond fine i dunno what is the matter any advise?
thanks

I think the 6mm ply nailed is the safe bet as to whats happened..

how long ago did you do it, are more likely to pop up? should have really used hardiebacker and screws, useless info after the fact I know

thanks for quick respones, hardibacker? is that like a thicker ply? and i finshed it today. what should have been used ??
thanks again

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Originally Posted by Unregistered

thanks for quick respones, hardibacker? is that like a thicker ply? and i finshed it today. what should have been used ??
thanks again

hardie backer is like a cement/fibrous board, far more water resistant than ply, doesn't need priming, in short, the correct overlay for the job and it's only 6mm thick!

I had the same problem once, The chippy i was tiling for did all the prep work to the floor prior to me tiling, I finished the tiling came back next morning to grout, there were loads of tiles popping, upon lifting the tiles i found that the ply had delaminated, but it looked fine before tiling commenced, after speaking to the chippy about it I found out that the ply he had put down was recovered from a skip on the site where he was working, and had been wet previously.
Is it possible that the ply has been water damaged prior to you tiling on it?