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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 lay tile directly on a plywood countertop, but if it’s a high-traffic surface in a kitchen, it’s better to add a moisture-resistant base. Plywood is susceptible to moisture, so if dampness seeps through from the surface around the sink or where you prep food, it can cause the plywood to warp, leading to grout damage, cracked tiles, or mold growth under the surface. 

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. 

Glass, ceramic, porcelain, and natural stone are all excellent choices for tiling a shower floor. Some glazed finishes can be slippery when wet. Your tiling contractor can provide more information on which tiles will work best for your shower floor.