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The reasons not to install flooring underneath a bathtub outweigh the benefits. A properly installed bathtub will keep water from reaching the unprotected subfloor underneath. Installing a tub on top of finished flooring can lead to damage and scratches to the new floor. Also, a small leak from a tub drain may be more difficult to notice if finished flooring impedes water drips.

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.

You can lay tile directly on a plywood countertop, but if it’s a high-traffic surface in a kitchen, it’s better to add a moisture-resistant base. Plywood is susceptible to moisture, so if dampness seeps through from the surface around the sink or where you prep food, it can cause the plywood to warp, leading to grout damage, cracked tiles, or mold growth under the surface. 

Grouting hearth tiles is one of the most important steps. It seals the tiles so heat doesn’t transfer under the tiles so easily, which can be dangerous. For this reason, heat-resistant grout is a must. Grout also prevents dust, dirt, and any other material from gathering between your tiles. If this happens and those buildups are flammable, a fire could start between the tiles.