Uneven tile (lippage)

Symptoms

• One tile edge noticeably higher than the adjacent tile
• Catches a mop, broom, or bare feet at the edge
• More visible with raking light across the floor
• Uneven feel when walking across the seam

Likely causes

• CommonUneven substrate under the tileA subfloor that isn't perfectly flat causes tiles to sit at slightly different heights.
• CommonInconsistent thin-set application during installationToo much or too little mortar under one tile compared to its neighbor creates a height difference.
• PossibleTiles with slight warping from the manufacturerLarge-format tiles are especially prone to slight factory warp that causes lippage.
• Less commonSettling or movement after installationStructural movement over time can shift a tile's height slightly.

What to do

1. Check the amount of lippage with a straightedge laid across the seam to gauge severity.
2. For minor lippage, a diamond hand pad or grinding tool can carefully level the high edge, working slowly and checking often.
3. Protect surrounding tiles and grout with tape while grinding, and wear eye and respiratory protection for the dust.
4. For lippage severe enough to be a trip hazard, removing and reinstalling the affected tile with corrected thin-set depth is more reliable than grinding.
5. When reinstalling, use tile leveling clips or spacers designed to keep large-format tiles flush during setting.
6. Regrout around any tile that was reset, matching the existing grout color and cure time.
7. For a whole floor with widespread lippage from a poor original installation, consult a tile professional about the best path forward, since it may point to a subfloor prep issue.

Tools and parts

• Straightedge
• Diamond hand pad or grinder
• Dust mask
• Safety glasses

When to call a pro

Call a tile installer for widespread lippage or if grinding doesn't sufficiently level a high edge.

Safety