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You can attach tiles to a wall using thin-set mortar. You’ll also need a notched trowel to create grooves within the adhesive so it flattens completely when pressed in and securely holds the wall tiles. Finally, you’ll need grout to smooth the gaps between the tiles and, ideally, a grout sealer to prevent mold. While it sounds simple enough, proper planning and execution are crucial, so carefully review the steps in this guide or hire a pro tile installer to complete this project.

Terracotta tile is a broad term for clay tile that’s been fired in a kiln, and Saltillo tile is a specific type of terracotta tile produced in Saltillo, Mexico. In addition to Saltillo, terracotta tile comes in a range of other shades and styles. You’ll often find it used in buildings throughout Mexico, southern Europe, and the western United States.

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.

Your floors should be completely level for tile, otherwise you risk damaging the tiles in the future. When there are even small gaps or hills in the subfloor beneath the tile, this puts more pressure on the tile when you walk around on the floor. With repeated traffic, the tiles are at risk of cracking, and you’ll have to deal with tile repairs sooner than if the floor was completely level.