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Ceramic tile adheres best with premixed adhesive or mortar. If you’re installing the tile in an area with moisture, such as a bathroom or kitchen, opt for waterproof adhesive, and if you choose mortar, make sure it’s thick because that is the easiest to work with and ensures the tiles will sit flat.

For best results, you should remove the toilet in a bathroom before removing tile or installing new tile. If you don’t remove the toilet, it will be harder to fully waterproof the tile around the toilet, which could increase the risk of mold growth or plumbing leaks. If you have trouble removing the toilet, hire a plumber to help.

You can technically install tile over tile, but we don’t suggest it. Installing tile over any surface that isn’t a completely flat and prepared subfloor will result in a shoddy overall job, uneven flooring, tiles that don’t adhere, extra weight, gaps, cracks, and room for moisture and dirt to enter. For the best results, only install new tile on a flat, sanded surface like subflooring or concrete that is prepared for tile.

If you have asbestos tile and would rather tile over it than remove it, or if your existing tile is completely flat and bonded tightly to the floor, you may be able to tile over existing tile. But experts recommend thinking twice before you do.

Thinset mortar is the best adhesive for ceramic tiles on concrete. It is easy to work with and has a slower dry time than mastic or epoxy mortars. This longer dry time gives the installer more time to adjust tiles, which is especially useful for DIYers who may not have tile installation experience. It can also be built up to help level any depressions or gaps in the concrete subfloor.