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You primarily need to be concerned about the moisture level in concrete when you are dealing with a basement or other below-ground part of your house. If you find any indication of moisture in your subterranean space, consider calling in a professional for further testing and moisture control solutions.

Concrete sealers will help your garage floors resist water, but they will not make the floor waterproof. You will need to purchase a specific waterproof floor paint for concrete and apply several coats over several days if you want your garage floor to be truly impermeable. While the process is similar to sealing the floors, the materials are different, and the need for multiple coats will extend the process and drying time.

While you shouldn’t use thinset mortar on its own as a floor leveler, it can work alongside other products to help level floors. For instance, you could start with a self-leveling compound, let that dry, then apply backer board with thinset mortar to help fully even out the floors ahead of laying tile.

Self-leveling compound usually requires up to 24 hours to dry before you can begin installing tile. It’s best to follow the instructions on the self-leveling product label for appropriate dry time. If you’re still not sure, play it safe and give the self-leveling compound two days to dry before you begin the tiling process.