cracking grout

[White Room]

Porcel flex requires the ply floor to be primed with sbr before before fixing....

 

[Time's Ran Out]

It's a DIY'er and he kept the money he should have paid to have the guarantee of a proper job!

 

[David - Tradetiler]

providing you do not have underfloor heating and your tiles are smooth enough why not try testing the bond the offending tile with a tile or glass sucker?

The only grout that will be man enough never to crack is epoxy grout. Problem is, it adheres so well that the movement will be forced into the tile causing it to crack. Like the others have said, there is no point bolting the stable door after the horse has bolted