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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.

When tiling over concrete, you should install an anti-fracture membrane after the concrete has been prepared. The anti-fracture membrane acts as a moisture barrier and should be installed to protect the tiles from moisture which helps maintain their integrity. Often, Ditra, a brand name, is used interchangeably with moisture barrier.

Tile shouldn’t be set tight against the tub. Bathtubs can expand when filled, and they can shift slightly with the weight of occupants. For this reason, it’s important to leave a slight gap between the bathtub and the first row of tile. Aim for a narrow gap of approximately 1/16 of an inch, filled with caulk, to allow for this expansion and movement while still allowing for tile shower waterproofing.