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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.

Yes, you can install a backsplash directly onto drywall, provided the wall is properly prepped, clean, and dry. For best results, especially in kitchen areas, your walls should be made of moisture-resistant drywall, often called green board. If your current wall isn't moisture-resistant, it's recommended to replace it before installing the backsplash. For even greater protection against water damage, you can remove the existing drywall and install a tile backer board or cement board instead. While properly installed standard drywall is typically strong enough to support a backsplash, some local building codes may require water-resistant materials in kitchen areas, so it's a good idea to check.

It’s easiest to start from an edge as it gives you a straight line. A problem may arise if your edge doesn’t line up perfectly, in which case it’s best to start from the center. Some think that starting tile from the center adds a focal point in the center of the hearth. 

Tiles last for around 100 years or more. Tiles on backsplashes can last even longer since they’re less likely to crack under foot traffic or from accidental drops, but even tile in high-traffic flooring can last a century or more with proper installation and upkeep. Porcelain tiles are denser and stronger than standard ceramic tiles, so they’ll last longer, often pushing past the 100-year mark.