Tile Do-over Have a few questions
So about three years ago, I tiled my bathroom. Shortly thereafter, the tiles started shifting when I stepped on them in a few spots. It quickly became clear I made some errors. I thought the shifting was due to the fact that I did not mortar under the backerboard.
Today I finally got around to pulling it all up. I'm now back to square one. Nice flat wood subfloor. When I pulled the tile up today, it was obvious with the way the tiles popped up that the mortar under the tiles was likely the problem. The backerboard seemed to be down nice and tight.
So that all being said, before I get over ambitious to finish the job and screw it up again, should I put mortar under the backerboard or not?