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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). 

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.

The lifespan of bathroom tile can be 50 years or more, depending on proper installation and regular maintenance. A well-done tile job, whether it's a new installation or a retiling project, can last for many decades. To lengthen the life of your tile, it's best to have it installed by a professional and to perform regular maintenance. This includes routine cleaning, resealing, and regrouting as needed. With proper care, you can expect your tile to last 10 years or more before needing major repairs or retiling, especially in high-traffic areas where tiles can wear out more quickly.

There are no unbreakable rules of design, but experts recommend against using large tiles in areas with poor subflooring where they’re more prone to cracking, in areas where the floor isn’t entirely level, over raised areas or dips, and in bathrooms where budget is the primary concern. The size of your bathroom shouldn’t be a reason not to use large tiles; in fact, larger tiles, also known as slab tiles, can be a modern and sleek choice for bathroom floors and walls.