Grout and caulk are commonly used together, especially in bathrooms. Grout goes between the tiles and keeps them sturdy and in place on the walls or floor. Caulk goes in corners or where two different materials meet (like where the bathtub meets the tile) to create a waterproof seal. However, they are not interchangeable—you shouldn't use caulk to adhere tile and shouldn’t use mortar if you need a waterproof seal.

It’s not a good idea to lay tile and grout on the same day. The adhesive or thin-set that sticks the tiles to the surface needs plenty of time to dry before you can grout. Wait for 24 to 48 hours, depending on moisture levels in the space. The tiles can become misaligned and more prone to damage if you don’t wait.

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.

When tiling over concrete, you should install an anti-fracture membrane after the concrete has been prepared. The anti-fracture membrane acts as a moisture barrier and should be installed to protect the tiles from moisture which helps maintain their integrity. Often, Ditra, a brand name, is used interchangeably with moisture barrier.