Many problems with tile stem from.
How to stop bathroom floor tiles cracking.
If the tile cracks are long continuous and extending across multiple tiles the concrete below has likely cracked.
How do you repair hair line cracks in tile.
You can buy kits like the one below that has charts for.
However cracks wider than 1 8 inch will eventually transfer to the tile it notes.
Because hairline cracks are so small you may need to use a toothpick to push the epoxy compound down into each crack.
You don t want to apply the filler only to find it s gunked up from dust and dirt that were on the floor.
Or maybe even go with a mesh mud floor where basically you put mesh down then you put a mix of concrete over that floor a slurry mix and then level it out and then glue the tile on top of that so that it s absolutely rock hard and perfectly flat.
Wipe clean with a cloth and allow the tile and the crack to dry thoroughly.
Take these precautions to prevent tile cracking in the future.
Remove any debris from the crack and then use tile cleaner or dish detergent to remove any dust and grease.
Use a clear epoxy.
The only wholesale cure is to strip the tile and then install a crack isolation membrane before installing tile again.
Fill the expansion gap around the perimeter of the room with caulk rather than grout to help the floor flex and prevent cracking or popping.
Is it just the grout that is cracking or are the tiles loose.
If it s the floor grout only then buy a grout rake a tool with rough carbide teeth that will remove the grout when you run it down the line regrout using latex and grout not water allow the grout to stand a little before wiping off with a clean sponge.
Let the tiles dry for 24 hours then grout the floor.
Minor cracks can be repaired with a small amount of epoxy and some paint.
This is known as reflective cracking and it can be easily prevented by adding a crack isolation membrane during installation.
A clean towel.
Creating a thicker subfloor.
For a concrete subfloor the most effective thing to do is add steel reinforcing bars when the concrete slab is poured.
For your next step you want to mix up your paint.
How to stop floor tiles from cracking method 1 of 4.
Generally hairline cracks in the concrete will not present an issue to the tile floor above.
First clean the tile.
Measure the distance between floor joists.
Apply a clear epoxy resin to any hairline cracks you find.