Tile install problem?

Question

I recently installed tile on the floor of a small bathroom. I didn't put any cement board down although I did consider it, but decided not to due to the small space and didn't think I would have any movement to worry about. But now the grout has cracked. Is there anything I can do about this without breaking out the tile that is already down? Please only answer if you are experienced in tile. Thank you in advance

Answer 1

You are getting movement and deflection.. That is why the grout is cracking.. You need at least 1/2 in board down (thinset and then nail or s***w it down).. Sorry but the only way to correct your mistake is to rip it up and start anew   The American Tile Counsil calls for a minimum of 1 1/4 in total substrate  to lay tile 3/4 + 1/2 is the norm..GL