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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 choice of whether to tile or use an acrylic tub surround is up to you and can be based on a number of factors, including aesthetics, cost, waterproofing, ease of cleaning, and maintenance.

Tile is a beautiful, classic bathtub surround choice; while tile installation cost is higher, it’s customizable and offers visual appeal. Tile is also harder to clean and presents waterproofing problems because of grout lines. Acrylic surrounds can be more affordable, don’t require much maintenance, and are easier to clean. However, they aren’t usually as visually appealing and may need to be replaced if they become damaged.

The difference between floor and wall tiles is that floor tiles generally have higher strength and porosity ratings than wall tiles. Wall tiles are typically weaker and more likely to crack or become damaged under sustained pressure like high foot traffic. 

For this reason, avoid using wall tiles on floors and vice versa.

Larger tiles can be difficult to install because they’re heavier and bulkier than their smaller counterparts, which makes them harder to haul around and put in place. Plus, if you don’t install the tiles correctly, they could crack or break. For these reasons, it’s best to hire a professional for large-format tile installation.