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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, when done correctly, removing the tile shouldn’t damage the subfloor. However, if there was pre-existing damage to the subfloor from standard use or lack of maintenance, the subfloor may need repairs. For example, if the contractors notice mold growth on the subfloor or an uneven surface, you may need more extensive services before installing new tile.

If you DIY tile removal, remove the tiles one step at a time, individually removing the tile, grout, and mortar to prevent unnecessarily damaging the subfloor. Depending on the age of your home, consider having a professional inspect the subfloor to ensure it’s in good enough condition to lay new tile.

Yes, but you should only put tile directly on drywall in smaller areas that don’t experience excess moisture. For example, a small kitchen tile backsplash could work, but installing tile directly on the drywall in a bathroom or other chronically damp area is not a good idea. Either way, a cement backer board is a far more reliable solution, as drywall is susceptible to moisture and can warp or cause your tiles to crack.

It’s best to start with tiling the shower floor before moving on to the walls for the most visually-pleasing results. When taking on any tiling project, you’ll want the wall tiles to “sit” neatly on the floor tiles rather than overlapping them. Finishing your floor tiles first will allow you to place your wall tiles without any gaps, holes, or awkward intersections.