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Yes, it would be best if you waterproofed your shower walls before tiling. The cement backing board behind the tile is not waterproof; it’s only water-resistant. On top of your tile backing board, be sure to use a waterproof shower membrane before you start installing your shower tiles.

The easiest tile size to install is large tiles, and they’re easier to install than small tiles—the job is faster and simpler when there’s less placing, adhering, and grouting to do. However, when tiles get really big, they’re more difficult to handle, cut, and fit. Standard floor tile sizes are 12-by-12 inches, 18-by-18 inches, and 12-by-24 inches.

Terracotta tile is a broad term for clay tile that’s been fired in a kiln, and Saltillo tile is a specific type of terracotta tile produced in Saltillo, Mexico. In addition to Saltillo, terracotta tile comes in a range of other shades and styles. You’ll often find it used in buildings throughout Mexico, southern Europe, and the western United States.

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.