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Yes, it would be best if you waterproofed your shower walls before tiling. The cement backing board behind the tile is not waterproof; it’s only water-resistant. On top of your tile backing board, be sure to use a waterproof shower membrane before you start installing your shower tiles.

On average, tiling a bathroom involves about 12 hours of labor, usually spread over two to three days to accommodate prep work and curing times. A professional tiler can often complete the installation in 6 to 8 hours, whereas a DIYer might take 10 to 16 hours. The total project time is influenced by factors like the bathroom layout, tile type, and necessary prep work, such as removing old tile. The process includes specific timelines for different areas; for example, tiling a floor takes about six hours, while a shower area can take six to ten hours. It is essential to allow for adequate curing time—typically 24 hours each—for the mortar, grout, and caulk, which is why the project extends over several days.

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). 

Poured-in-place terrazzo flooring is more durable than tile. In fact, it’s one of the most durable types of flooring on the market. It can last anywhere from 40 to 100 years, depending on maintenance. On average, you can expect your terrazzo floor to last about 75 years, but you will have to make repairs as needed.