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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.

You can let the tile sit without grout. Don’t panic if there’s a delay between installing the tiles and grouting. A substantial stoppage isn't a problem, provided you keep the tile surface clear of dust and debris. Also, avoid walking over less stable ungrouted floor tiles as they are more prone to premature cracking and shifting. 

When choosing tiles for a shower floor, avoid highly porous tile materials, like those with a water absorption rating over 7%. Don’t use non-vitreous tiles, or tiles fired at low temperatures, because they will absorb more water. If you use a highly porous tile in the shower, the tiles can wear down faster, meaning they’ll need to be replaced much sooner.

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.