I noticed a tile in my shower was loose, so I figured I would pull it off and reattach it. When I pulled it off I found water had gotten behind the tile and deteriorated the backer board behind it. So now there is nothing to attach the tile back too.
Do I have to replace the entire wall of backer board? Then re-tile? Or is there a way to replace just the lower portion for the tiles to attach too?
I'm sure there is no leak as the board is intact and fine above.