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As long as you follow the instructions on your peel-and-stick tile packaging, it should not damage your walls. A possible instance when you may accidentally damage your walls is if you install tiles improperly using additional adhesives that aren’t recommended.

Also, you can damage your walls if you’re not careful when removing tile. For example, you could accidentally make holes in the drywall with a paint scraper if you don’t heat the adhesive long enough before trying to pry it off.

The tile spacing you should use will depend on the tile and where you’re installing it. Choosing the right tile spacers to maintain a consistent gap between your tiles is tricky. Generally, tile spacing shouldn’t be less than 2 millimeters on walls and 3 millimeters on floors because of stress relief requirements. Getting it wrong can result in uneven tiles and early repairs.

Yes, it’s always a good idea to keep a box or two of spare tiles after a home renovation project. Tiles can crack from improper installation, heavy foot traffic, and impact from drops. Having some extra tile on hand can make replacement fast, easy, and affordable. Plus, some manufacturers might discontinue particular colors or styles, and slight variations in tile colors between batches could mean mismatched tiles even if your product isn’t discontinued. Having a few spare tiles in storage can help avoid these issues, as well.

You can technically install tile over tile, but we don’t suggest it. Installing tile over any surface that isn’t a completely flat and prepared subfloor will result in a shoddy overall job, uneven flooring, tiles that don’t adhere, extra weight, gaps, cracks, and room for moisture and dirt to enter. For the best results, only install new tile on a flat, sanded surface like subflooring or concrete that is prepared for tile.

If you have asbestos tile and would rather tile over it than remove it, or if your existing tile is completely flat and bonded tightly to the floor, you may be able to tile over existing tile. But experts recommend thinking twice before you do.