I have a master bathroom that has some tiles that move up and down when you step on them, and they creak. The house is 14 years old. The tiles are most likely original, and are 11.5 inches square, spaced on 12 inch centers.
The 2 loose spots are generally in front of a sink, which would get the most use. The floor makes a creaking sound, similar to flooring out in the hallways or stairs and areas with high traffic. I believe this is subflooring that is no longer tightly nailed down.
The grout has broken up in these areas. I have removed grout from around ~ 9 tiles square. Several tiles, especially those up against the cabinets are loose. Others do not move. The grout came up easily, by prying the pieces out.
Question is, “what is the recommended repair?” Do I need to pull up the tile and renail the sub flooring? Is there something missing on the subflooring to allow the movement and creaking?
I have never put down tile, and do not know what is under the tile. I have put down pre-finished hardwood floor (not laminate), painted, and replaced windows. Note that I am preparing the house for sale, and my goal is to repair the broken grout so it does not detract.