I had Amtico Spacia fitted in my kitchen/dinning room about 3 years ago, the room is two rooms knocked into 1, half the room has a concrete floor, the other half 6mm WBP ply screwed to wooden floor boards. The installier layed it over two days, the first day he layed either a latex or a thin screed, it was grey in colour, the next day he put down the amtico. After about 2 years areas on the wooden half started to lift in the hot weather, but go back down, i phoned the floor layer and was told everything was ok, and it was normal has it was contact adhesive and would reglue it self, but now the individaul strip are coming up. i have had a different company come out and they said he didnt use flexi latex when installed it so when the ply move it has come away from the floor,and the flood needed to be taken up and a new one but down . if you lift the tiles the latex is stuck to the back of it. The concrete half of the floor is fine. I want . i want to try to reglue these tiles as floor cost me alot of money and would like to get a few more years out of it, the chap who came out told me to try "F40" a local flooring shop recommened "F60" but when i phone the manufactures they told me it would not work because the latex/screed is cememt based. i've also phoned Amtico technical help line but they could not help. Has anybody come across this problem before and what did you use to restick the flooring ? Many thanks for any help. 
