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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.

To make a bathroom look bigger, choose light-colored, medium- to large-format tiles. Light colors such as white, cream, or light gray make a space feel more open, while dark colors, busy patterns, and small tiles can make a bathroom feel smaller. It may seem counterintuitive, but small tiles can shrink a room visually due to the increased number of grout lines. Using medium- to large-format tiles creates a more seamless look. For the best effect, pair your light-colored tiles with a matching or similarly colored grout. This minimizes the grid-like pattern and gives the floor and walls a more continuous, uninterrupted appearance, helping the room feel significantly larger.

No, you don’t technically need a cement backer board for a wall tiling project, but not using it risks disastrous moisture damage. Cement is naturally water-resistant, whereas drywall soaks it in, which can lead to warping or mold growth. Always use a backer board treated with a waterproof membrane for bathrooms and other chronically damp areas to ensure complete tile shower waterproofing.

There are no unbreakable rules of design, but experts recommend against using large tiles in areas with poor subflooring where they’re more prone to cracking, in areas where the floor isn’t entirely level, over raised areas or dips, and in bathrooms where budget is the primary concern. The size of your bathroom shouldn’t be a reason not to use large tiles; in fact, larger tiles, also known as slab tiles, can be a modern and sleek choice for bathroom floors and walls.