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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.

The cost depends on the type of natural stone. High-end stones can cost as much as porcelain, but it depends on the specific material. For example, the cost of flagstone pavers is typically $2 to $6 per square foot, which is much more budget-friendly than porcelain. Outdoor slate tile can cost as much as $35 per square foot, which is about the same as porcelain.

When cleaning porcelain tiles, avoid products that contain ammonia, bleach, and other harsh chemicals. Acid-based cleansers can damage the tile, though you can clean them with a diluted mixture of one-quarter cup white vinegar mixed with one gallon of hot water. It is important always to use a soft-bristled brush or sponge, since hard bristles and steel wool can scratch the tile.

The easiest tile size to install is large tiles, and they’re easier to install than small tiles—the job is faster and simpler when there’s less placing, adhering, and grouting to do. However, when tiles get really big, they’re more difficult to handle, cut, and fit. Standard floor tile sizes are 12-by-12 inches, 18-by-18 inches, and 12-by-24 inches.