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Yes, unfortunately, it is normal for wall and floor tiles to crack, especially when you drop heavy items on tiled floors or place heavy objects on them. Tiles are also more susceptible to cracking when ceramic tiles designed for walls are installed on floors, as these are often not strong enough to handle heavy loads from foot traffic and furniture. Similarly, tiles that are installed incorrectly, lack adequate subflooring, or have other installation problems are prone to cracking. To avoid these problems and the inevitable repair and replacement costs they bring, always hire a professional for tile work and follow best practices for installation.

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.

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.

Grout lines should typically be between 1/8 to 3/16 inch thick. This ensures enough room for the grout to dry properly and makes them wide enough to look clean and professional. If grout lines are too small, it can be easier to see imperfections in the spacing.