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Porcelain and ceramic tiles are made from clay, but porcelain tiles are fired in a kiln at a higher temperature. This makes them more durable, but it also means porcelain is more expensive than ceramic at $3 to $5 more per square foot.

Even with the higher price point, many people choose porcelain over ceramic because there are more color and design options.

No, you don’t need to remove the old grout before installing new tile over existing tile. In fact, the old grout helps fill in gaps between tiles, creating a more even surface for the new layer. However, it's important to ensure that the grout is clean, solid, and free of cracks or crumbling areas. Damaged grout should be repaired or replaced before proceeding. Cleaning the surface thoroughly and filling any low spots will help the new adhesive bond properly and ensure a smooth, stable installation.

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.

To ensure an even and unbending surface to lay tiles on, you’ll typically need to put a subfloor under a tile floor. Fiber cement backboards are the most common choice, but using plywood is also possible. Don’t neglect this step, or you could risk water damage and grout or tiles prematurely cracking or crumbling, especially in an area with high foot traffic.