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Silicone caulk shouldn’t be used in place of grout because each material serves its own purpose. Thanks to its flexibility, silicone caulk is good for sealing around the perimeter of tiled floors, where movement and expansion might occur. However, grout is more durable, making it a better option for the joints in between tiles, which need to withstand constant weight and foot traffic.

Deciding between using a shower pan or tile will likely come down to the shower’s design. You can learn how to install a shower pan liner, but it has a standard look similar to most other showers, though there is some flexibility for material and color choices. Tile, on the other hand, can be customized and is set directly into the shower base. However, a shower tile floor is more difficult to install than a shower pan.

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. 

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.