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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.

If the hearth ends against a wall, you can use a tile cutter as you normally would. However, if the edge of your hearth ends with no surface pressing against it,you may want to look into rounded tiles. These give a smooth edge to your hearth and make sure cut edges aren’t visible. You can also see if the tile you have has pieces that have been glazed or rounded on one edge. You’d then cut the tile and place it normally, with the cut edge facing inward. 

Tile—specifically smaller, mosaic-style tiles—is the best type of flooring for building a walk-in shower base. Shower pans come with a threshold and sidewalls to contain the water, but tile can be set into the shower base. This creates a walk-in shower floor that gently slopes toward the drain to keep water from getting out and into the rest of the bathroom.

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.