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No, you don’t technically need a cement backer board for a wall tiling project, but not using it risks disastrous moisture damage. Cement is naturally water-resistant, whereas drywall soaks it in, which can lead to warping or mold growth. Always use a backer board treated with a waterproof membrane for bathrooms and other chronically damp areas to ensure complete tile shower waterproofing.

Whether you want to match your tile trim with grout comes down to your personal preferences. If you match the two, it can help your tiles to stand out while providing a clean, cohesive look. On the other hand, you might opt to match your tile trim with your tiles. The best option will depend largely on your tile design, as well as how it fits overall with the rest of your room.

To ensure an even and unbending surface to lay tiles on, you’ll typically need to put a subfloor under a tile floor. Fiber cement backboards are the most common choice, but using plywood is also possible. Don’t neglect this step, or you could risk water damage and grout or tiles prematurely cracking or crumbling, especially in an area with high foot traffic. 

If you hire a professional to install a new floor, you can expect to pay between $50 and $75 per hour for labor. It takes two days on average to install a new floor as part of a bathroom remodeling project, but your timeline depends on your bathroom’s size and layout.