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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.

You cannot tile directly over hot mop waterproofing because tile requires a smooth, solid surface to adhere properly. Additionally, the shower bed pan needs to be raised and sloped toward the drain to prevent water from pooling. However, you can hot mop and apply a sloped mortar bed over the top (to which the tile can then be adhered). 

Porcelain countertops have a fairly long life span, sometimes lasting for decades. Depending on how much wear and tear you put your countertops through, it could last 25 to 50 years. But be warned, porcelain is also prone to cracking, so as long as you take good care of it, you’ll have those countertops looking brand new for years to come.

Tile countertops can be an excellent and budget-friendly option for a kitchen, provided they are installed correctly. It's important to choose tiles, such as ceramic, that are heat-, water-, and scratch-resistant. When the grout is properly sealed, it will resist stains, making the surface easy to clean. Tile is also considered a sustainable material. For a cohesive kitchen design and added protection, you can pair a tile countertop with a matching tile backsplash.