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.

Silicone caulk shouldn’t be used in place of grout because each material serves its own purpose. Thanks to its flexibility, silicone caulk is good for sealing around the perimeter of tiled floors, where movement and expansion might occur. However, grout is more durable, making it a better option for the joints in between tiles, which need to withstand constant weight and foot traffic.

Tile installation can be expensive because it requires more time and labor to install than many other materials. For example, laminate flooring can click and lock into place, and carpet comes in large rolls that you can secure to the floor. On the other hand, tiles need to be cut, laid individually, grouted, and left to cure.

Natural stone floors, especially pebble-style tiling, are one of the least slippery options for a shower floor. Natural stone has a texture to reduce slickness, and pebble-shaped tiles add more visual and textural contrast while reducing slippage. Vinyl tiles are also designed with anti-slip texture for added safety. If you have a slippery tile, be sure to add a grippy shower mat to reduce the risk of falls.