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Like glass tiles, you will not need to seal most porcelain tiles, particularly if the porcelain is already glazed. It depends on quality. Porcelain is very water resistant, but it is not 100% waterproof. To avoid staining, some homeowners use a penetrating sealer. It is also a good idea to seal your grout. Unless you use epoxy grout, grout is very porous and can harbor bacteria, mold, and mildew.

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.

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.

Yes, unfortunately, it is normal for wall and floor tiles to crack, especially when you drop heavy items on tiled floors or place heavy objects on them. Tiles are also more susceptible to cracking when ceramic tiles designed for walls are installed on floors, as these are often not strong enough to handle heavy loads from foot traffic and furniture. Similarly, tiles that are installed incorrectly, lack adequate subflooring, or have other installation problems are prone to cracking. To avoid these problems and the inevitable repair and replacement costs they bring, always hire a professional for tile work and follow best practices for installation.