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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.

Yes, you can install a backsplash directly onto drywall, provided the wall is properly prepped, clean, and dry. For best results, especially in kitchen areas, your walls should be made of moisture-resistant drywall, often called green board. If your current wall isn't moisture-resistant, it's recommended to replace it before installing the backsplash. For even greater protection against water damage, you can remove the existing drywall and install a tile backer board or cement board instead. While properly installed standard drywall is typically strong enough to support a backsplash, some local building codes may require water-resistant materials in kitchen areas, so it's a good idea to check.

The rule tells you how to cut tile to install it in a corner. The 3/4/5 rule recommends that you should have 3 feet across on one straight line, four feet on the other perpendicular line, and 5 feet of length from the end of one of the lines to the other. You’re making a right triangle with the tile, and the hypotenuse (the line across from where the 3-foot lie and 4-foot line meet) should be 5 feet long.

The grout shade you choose comes down to personal taste and preference. A darker grout will give you a more dramatic and noticeable contrast with the tile around it; however, lighter grout helps create a more uniform look when blending the colors together. Additionally, a darker grout combined with a patterned tile could be overwhelming to the eye, while lighter grout makes the pattern stand out as the main focus.