Whole tile not stuck and cannot lift becasue of underfloor h

[homesolutions]

Hi there i have put underfloor heating down and tiled on top with slate, all looks fine but one of the tiles is not stuck down on about a 3rd of the tile and there is some movement.
I have tried putting some spacers underneath to take the strain and i cannot lift the tile because it could ruin the underfloor heating wire.
Has anyone got any ideas as i am worried that the grout will always crack on the joint?
Thanks in advance

 

[jefoss]

so your sure you cant lift the tile up definatly without causing any damage at all?

how wide are the joints? if they are 4 or 5mm you might be able to make some adheisve up, but really runny, and pour it into the grout gaps and let it set, but leave it a lot longer than you would normally for obvious reasons, then you should have sorted the problem, re grout with the same as before as to make it similar!

 

[homesolutions]

Hi there the tile is well stuck down apart from the end and the gap is around 3-4 mm so i suppose the runny adhesive is an option to try unless there are any other suggestions?