Self-leveling underlayment is a great choice under any tiled floor, but it's the absolute best choice when installing tile over an in-floor heating system.

When should I use self-leveling?

Whenever you need to repair, level or raise a floor, self-leveling concrete can be a fast, cost-effective solution. Self-leveling concrete can be used as an underlayment for tile, carpet, or other floor coverings.

Is self-leveling compound necessary?

A self-leveling compound is ideal in smoothing out uneven wood floors and concrete floors. Concrete floors may have bumps, especially if poured incorrectly; wood floors often have problems with dips and bumps. ... A self-leveling compound will prevent this, although it's not always a perfect solution.