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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. 

No, tiling over painted walls or wallpapered surfaces is generally not recommended. Textured surfaces and paints will affect the adhesive, possibly causing tiles to lift or fall off. Painted walls with a semi-gloss or high-gloss finish are particularly difficult for adding tiles. It’s wise to strip the paint first if you install the tiles to drywall, although it’s still best to opt for a cement backer board.

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.

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.