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It’s best to start with tiling the shower floor before moving on to the walls for the most visually-pleasing results. When taking on any tiling project, you’ll want the wall tiles to “sit” neatly on the floor tiles rather than overlapping them. Finishing your floor tiles first will allow you to place your wall tiles without any gaps, holes, or awkward intersections.

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.

It’s not necessarily normal for tiles to lift, although it’s one of the common issues people may have with their tile flooring. Tiles correctly installed by pros with expansion joints should not lift over time. However, if the installation was done poorly, you might see tiles tenting or lifting as the house settles. This is more common in high-moisture areas with extreme temperatures.

It’s important to leave a gap in the corner when tiling to allow room for tile expansion. Leaving between one eighth of an inch to one tenth of an inch is enough space.