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I was looking at replacing some caulking that has been cracking and I noticed there's a few loose tiles.

Here's a pic of the bathroom, it's on the second floor of our house: Bathroom

Here's where I noticed the tiles, there's also a hairline crack on one near the toilet: Area

The grout highlighted here seems to be loose and the tiles wiggle just a little bit. There's also a (possibly unrelated) hairline crack in one by the toilet: Highlighted

The surrounding tiles otherwise seem okay.

We replaced our toilet about a year and a half ago and the caulking didn't hold very well and is admittedly overdue for being replaced. That said, I think there always has been a creak in that spot.

How should I go about repairing this? What warning signs do I need to look for?

Update: I guess whatever the substrate is was cracked and the wood is damaged. Not sure how to lay something solid down to put the tiles on.

Floor

Removed Tile

  • A creak seems to imply that the floor moves, and you're going to have a fun time getting tiles to stay stuck to a moving floor ... – brhans Aug 23 '16 at 11:54
  • What kind of Underlayment or sub floor art the tiles attached to. With a cement backer board repair may not be hard other than trying to match the grout. If the floor is a wood product this may be much tougher once the wood gets wet and swells (especially with particle board / OSB type products) it can be tough to dry out and re set the tiles. In both cases I would probably use a Mastic or latex adhesive because of the flexing. – Ed Beal Aug 23 '16 at 13:58
  • @Ed Beal You would recommend mastic when you feel moisture may be a problem? Not a polymer modified mortar? – Chris Aug 23 '16 at 15:31
  • I have had better luck with mastic in areas that flex mortar tends to release easier in my experience. – Ed Beal Aug 23 '16 at 16:12
  • @EdBeal I wholeheartedly agree that mastic has superior flexibility, but it's water soluble, and organic matter. – Chris Aug 23 '16 at 19:58

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