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For glass tile, you want to use unsanded grout. Sanded grout is a stronger and grittier cement grout that is great for installing tiles with wider gaps and into joints. However, it is susceptible to scratching glass tile and is more difficult to use in thinner gaps. Unsanded grout, while more expensive, is easier to fit between thin gaps and is less harsh on delicate materials, like glass tile.

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.

For best results, you should remove the toilet in a bathroom before removing tile or installing new tile. If you don’t remove the toilet, it will be harder to fully waterproof the tile around the toilet, which could increase the risk of mold growth or plumbing leaks. If you have trouble removing the toilet, hire a plumber to help.

Tiles last for around 100 years or more. Tiles on backsplashes can last even longer since they’re less likely to crack under foot traffic or from accidental drops, but even tile in high-traffic flooring can last a century or more with proper installation and upkeep. Porcelain tiles are denser and stronger than standard ceramic tiles, so they’ll last longer, often pushing past the 100-year mark.