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Ideally, you should remove tile before installing hardwood floors, but there are good reasons not to. Removing stubborn tile can be a labor-intensive job that adds days to the project. The subfloor beneath the tiles could also be damaged during the process, meaning you’d have to repair the subfloor before installing the new hardwood floor. 

Like glass tiles, you will not need to seal most porcelain tiles, particularly if the porcelain is already glazed. It depends on quality. Porcelain is very water resistant, but it is not 100% waterproof. To avoid staining, some homeowners use a penetrating sealer. It is also a good idea to seal your grout. Unless you use epoxy grout, grout is very porous and can harbor bacteria, mold, and mildew.

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.

When choosing between porcelain and ceramic tile, the best option depends on your specific needs, budget, and project application. Porcelain tile is generally more durable, denser, and harder than ceramic, making it a good choice for busy, high-traffic areas. It also offers superior moisture resistance, making it ideal for moisture-retaining spaces. However, porcelain is typically more expensive, and its hardness can make it brittle, potentially causing it to crack if a heavy object is dropped on it. In contrast, ceramic tile is a more budget-friendly option with lower material and installation costs. It is softer and easier to work with, making it a great choice for DIY projects. While not as durable as porcelain, ceramic is still a quality material suitable for many home applications, particularly small, decorative projects.