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Yes, you can tile over existing tiles in a bathroom, but it is not always recommended. For this method to be successful, the original tile surface must be clean, flat, and free of damage such as cracks, unevenness, mold, or mildew. While tiling over existing tiles can save time and money, there are potential drawbacks. The new adhesive may not bond properly, and the process adds extra weight to the wall or floor. Additionally, the increased height of the surface could interfere with door clearances. For the best and most durable results, removing the old tiles before installing new ones is generally the better option.

Tile shouldn’t be set tight against the tub. Bathtubs can expand when filled, and they can shift slightly with the weight of occupants. For this reason, it’s important to leave a slight gap between the bathtub and the first row of tile. Aim for a narrow gap of approximately 1/16 of an inch, filled with caulk, to allow for this expansion and movement while still allowing for tile shower waterproofing.

You can use sanded or unsanded grout for a shower pan, but sanded grout isn’t the best option for shower walls. For those areas, you’ll want to use unsanded grout, which works well on vertical surfaces and is less likely to slump than sanded grout. Alternatively, you can use epoxy grout for shower walls.

Solvents dissolve tile adhesive, but the right solvent for the job depends on what type of adhesive you are trying to remove. For instance, dispersion adhesive requires stronger removers, like bile soap or even paint stripper, but some adhesives, like cement-based products, can come off with water and soap or mortar remover.