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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.

Once cracks appear, it is hard to stop tiles from cracking more. If the cause of the problem is improper subflooring, underlying concrete, improper tile joint sizes, mold growth, or structural issues, the only way to stop floor tiles from cracking is to redo the entire floor, fixing the underlying issues first. If cracks occur after impact damage, hiring a professional tile contractor to replace the cracked tiles, fix loose floor tiles, and restore the grout around them can prevent further damage. It is also important to keep your tile and grout clean and maintained to prolong its life.

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.

Solvents dissolve tile adhesive, but the right solvent for the job depends on what type of adhesive you are trying to remove. For instance, dispersion adhesive requires stronger removers, like bile soap or even paint stripper, but some adhesives, like cement-based products, can come off with water and soap or mortar remover.