I went into the bathroom this morning.....squish. Wait a minute, tile floors do NOT go "squish". But they do when you have a water leak at the shower valve, and the water has gotten under the tile and backerboard. Tearing out a tile floor, not the way to start a day.
Yup, pretty hard. Tore out the tile and backerboard, and a wall. Got the leak fixed. Now I am waiting for everything to dry out so I can put it back together.
