Self-leveling underlayment is a liquid-applied product that flows to cover the low points in a floor, hardening into a perfectly smooth and level surface. You should consider using it if your subfloor has inconsistencies that exceed the tolerances allowed by the tile manufacturer. This is particularly important for large-format tiles (any side longer than 15 inches), as these tiles have less surface area in contact with the mortar and are much more sensitive to deviations in the subfloor. A perfectly level substrate allows for a uniform thin-set thickness, which ensures a strong bond and prevents the tiles from shifting or cracking under pressure. While it adds an extra step and cost to the project, the use of self-leveling underlayment is an investment in the long-term success of your installation. It is far easier to level the substrate before the tile is laid than it is to fix a floor once the tile has been installed. If you are dealing with extreme level issues or structural slope, please consult with a professional to ensure your joists can handle the weight of both the leveling compound and the new tile.
Key considerations
- self-leveling underlayment for tile
- when to use floor leveler
- flat floor for tile
- Leveling Compound
- Underlayment
- Subfloor