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Tile—specifically smaller, mosaic-style tiles—is the best type of flooring for building a walk-in shower base. Shower pans come with a threshold and sidewalls to contain the water, but tile can be set into the shower base. This creates a walk-in shower floor that gently slopes toward the drain to keep water from getting out and into the rest of the bathroom.

Removing old tiles can be more complicated, but it can also be more manageable, depending on your circumstances. Typically, old tile is hard to remove because the adhesive had loads of time to bond with your wall, becoming a formidable foe between you and your new tile installation project. On the other hand, old tile in high-traffic areas can become loose, making it much easier to remove.

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.

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.