A flat, even tile surface isn’t just about aesthetics — it’s a sign of quality workmanship. One of the most common issues in tile installation is lippage, where adjacent tiles sit at slightly different heights. Even small differences can be noticeable, uncomfortable underfoot, and unacceptable to clients.
The good news? Lippage is preventable with the right preparation, techniques, and tools.
What Is Tile Lippage?
Lippage occurs when one tile edge is higher than the next. It’s most common with:
- Large-format tiles
- Warped tiles
- Uneven substrates
- Improper mortar coverage
Even experienced installers can run into lippage if conditions aren’t right.
Common Causes of Lippage
1. Uneven Substrate
If the surface beneath the tile isn’t flat, the tile won’t be either. Skipping proper floor prep is one of the biggest mistakes installers make.
Tip: Always check flatness before setting tile and use self-leveling compounds when necessary.
2. Inconsistent Mortar Application
Too much mortar under one tile and too little under another creates height differences.
Tip: Use the correct trowel size and maintain consistent trowel angle and pressure.
3. Tile Warpage
Many tiles — especially large-format ones — are not perfectly flat straight out of the box.
Tip: Use an offset pattern recommended by the tile manufacturer to minimize visible lippage.
4. Skipping a Tile Leveling System
Relying only on spacers doesn’t control vertical alignment.
Tip: Spacer clips and wedges work together to control both spacing and height.
How a Tile Leveling System Solves the Problem
A clip-and-wedge leveling system is designed to hold adjacent tiles at the same height while the mortar cures.
- Spacer clips maintain consistent grout joints and prevent tiles from shifting.
- Reusable wedges apply controlled pressure, pulling tile edges flush.
- The system holds everything in place until the mortar sets, reducing movement and human error.
The result is a flatter surface with less adjustment and rework.
Best Practices for Flat Tile Installations
- Always dry-lay tiles to check fit and pattern
- Back-butter large-format tiles for full mortar coverage
- Use leveling clips at recommended intervals
- Apply pressure evenly when inserting wedges
- Remove clips only after mortar has fully cured
The Professional Advantage
Using a tile leveling system doesn’t just improve results — it improves efficiency. Installers spend less time correcting uneven tiles and more time moving forward with confidence.
For homeowners, it means a cleaner, more professional finish that lasts.
Final Thoughts
Perfectly flat tile installations aren’t achieved by chance. They’re the result of proper preparation, consistent technique, and the right tools. By addressing the root causes of lippage and using a quality leveling system, you can deliver professional-grade results on every project.