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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.

When considering the types of grout for your project, unsanded grout is the best choice for penny tile. Unsanded grout can fit better into narrow spaces, like those between the small penny tiles, and it’s easier to smooth out for a seamless finish. However, if you’re unsure, check with a tile installation pro to determine which grout is best for your specific project.

If you’re out of spacers for your tile installation, you can use pennies. Each time you place a tile, stick the pennies around the edges (on the sides and the corners). Like working with spacers, you’ll want the same amount of space around each tile before they set.

When working on your bathroom floor tiling, you should always tile the floor first and then refit the toilet afterward. This has both practical and visual advantages—the tile will have a better seal, and the installation will look cleaner.

On the other hand, when you try to cut the tiles to fit around the toilet, you’re putting yourself at a disadvantage. It’s a lot more work, it’s hard to be precise, and mistakes or miscalculations can lead to future moisture damage to the tiling, grout, and subfloor.