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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.

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.

Yes, cracked tiles allow water to seep through the substrate or subfloor, leading to mold and mildew growth. It can also cause severe structural damage. At the very least, water damage can cause your tile to lift from the substrate, meaning one cracked tile can lead to several cracked tiles. It’s a good idea to waterproof tile in areas with direct water exposure or lots of moisture.

The difference between floor and wall tiles is that floor tiles generally have higher strength and porosity ratings than wall tiles. Wall tiles are typically weaker and more likely to crack or become damaged under sustained pressure like high foot traffic. 

For this reason, avoid using wall tiles on floors and vice versa.