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Yes, you can tile over existing tiles in a bathroom, but it is not always recommended. For this method to be successful, the original tile surface must be clean, flat, and free of damage such as cracks, unevenness, mold, or mildew. While tiling over existing tiles can save time and money, there are potential drawbacks. The new adhesive may not bond properly, and the process adds extra weight to the wall or floor. Additionally, the increased height of the surface could interfere with door clearances. For the best and most durable results, removing the old tiles before installing new ones is generally the better option.

While you shouldn’t use thinset mortar on its own as a floor leveler, it can work alongside other products to help level floors. For instance, you could start with a self-leveling compound, let that dry, then apply backer board with thinset mortar to help fully even out the floors ahead of laying tile.

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.

No, when done correctly, removing the tile shouldn’t damage the subfloor. However, if there was pre-existing damage to the subfloor from standard use or lack of maintenance, the subfloor may need repairs. For example, if the contractors notice mold growth on the subfloor or an uneven surface, you may need more extensive services before installing new tile.

If you DIY tile removal, remove the tiles one step at a time, individually removing the tile, grout, and mortar to prevent unnecessarily damaging the subfloor. Depending on the age of your home, consider having a professional inspect the subfloor to ensure it’s in good enough condition to lay new tile.