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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.

Most professional shower tile installations take between six and eight hours, depending on the size and complexity. Most projects get completed in a single workday. DIY-ing the project takes around three to four days or roughly 16 hours. However, this will vary based on the skill level of the person completing the work.

You should always use caulk instead of grout where the tile meets the wall. This will help your tile installation look great and last a long time. When you accidentally use grout for the corner seams, you end up making the tiles too rigid. So as the wall shifts over time, your tiles have no wiggle room. This can lead to tile damage, which will eventually require you to do at least a partial reinstallation.

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.