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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.

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.

Figure out how much tile you need by measuring the backsplash area. Measure the height and length in feet and multiply to get the square footage. Don’t make adjustments for outlets or small cutouts but subtract the square footage for windows or other large obstructions from the total. To account for waste, get 10% more than your calculation.

No, tiling over painted walls or wallpapered surfaces is generally not recommended. Textured surfaces and paints will affect the adhesive, possibly causing tiles to lift or fall off. Painted walls with a semi-gloss or high-gloss finish are particularly difficult for adding tiles. It’s wise to strip the paint first if you install the tiles to drywall, although it’s still best to opt for a cement backer board.