Caused by structural movement, and any of the following:

Bathroom wall tiles bulging. This reaction time is fixed and will not be extended by. The problem is that there are many possible causes for walls. Noticing your walls bowing or bulging is the first sign that you need to get the underlying problem resolved.

Simply place a sheet of aluminum foil over the loose or bulging region and iron it. You may have water damage under your tile floor if you notice that the tile is no longer sticking. The tiles bulging means that the wall behind it is bulging for some reason and everything needs to be demoed in order to properly fix the wall.

The tiles have stick to the adhesive, the adhesive has bulged causing delamination from the wall. Frankly the shower with the mold at the bottom. Try to find matching grout.

I pushed on them and they moved. The iron melts the glue to reactivate it. Subway bathroom wall tile ideas.

Once the tile adhesive has been mixed with water, the active ingredients begin to react chemically to produce adhesion. Position your chisel so the tip is sitting in the grout line on the edge of the tile, at its base. I had a new bathroom about three years ago, but over the past year i’ve noticed the tiles on one wall seem to be pulling away from it (see image).

Water got in behind the tile. Further investigation revealed many are loose and only held. Single tiles out of alignment with the existing grid.