When a subfloor is squeaking under tile there are really only two options.
Bathroom tile floor squeaks.
If the squeaking floor is coming from under a carpeted surface it s best to remove the carpet and drive hardened drywall screws next to every nail in the floor.
Drive a screw through the subfloor into the joist below and make sure to pull the carpet webbing over the screw head.
Tile floors squeak wherever a gap develops between the subfloor and the supporting joist beneath it.
You can fix the subfloor from below or pull up a tile or a few to fix the squeak from above.
This gap is filled with silicone so the grout doesn t touch the shower pan itself.
Sometimes squeaks are caused where the floor tile meets the shower pan.
Normally there should be a slight gap between the shower pan and the floor tile.
The tiles or subfloor are loose.
You can try to secure the subfloor from below by putting weight on the sqeaky area and then puting screws in the subfloor from below and adding screws from subfloor.
I doubt that it is the tile assembly itself moving independent of the floor but that would have to be verified.
Squeaks and creaks are a normal part of having hardwood flooring.
I have some very bad news for you and possibly some good if you have a basement under the room with the squeaks.
Squeaky floors are caused by the subfloor pulling away from the joists.
Start out by checking your rh levels.
Without the proper amount of silicone the pan will squeak.
These gaps occur as lumber dries and nails pop or at places where the subfloor is not properly.
But when you notice that squeak take a few moments to listen to what your floor is saying.
A squeaky ceramic floor is a particularly difficult problem because you really cannot fix it from the top down and if you don t fix it it will eventually break the grout if not the floor tiles because of the movement of the floor.
Squeaking is caused by something rubbing often the floor boards rubbing on a nails.
Normally this is avoided if when the wood subfloor underlayment is installed it is glued and screwed so there isn t any movement or chance for there.
You need to screw down the subfloor to the joist.
Finding the squeak in your floor is pretty easy.
Screws never pull out so they re a great solution against future squeaks.
Gaps are also a symptom of decreased rh levels.