Keep tiles level and eliminate lippage by using a proper tile leveling system from the first row onward.

Start by selecting a tile leveling system that matches your tile size and grout joint width, because thin joints need low-profile spacers and thicker joints need wider bases. Prepare a flat, true substrate by checking for high and low spots with a straightedge and use a self leveling compound for deviations greater than one eighth of an inch over ten feet. Butter both the substrate and the back of large format tiles with a notched trowel to ensure full contact and avoid hollow spots that cause rocking. Place the base of each leveling spacer under the tile edge as you set the tile, then lay the adjacent tile and install the cap or wedge so both tiles are held flush; use a dedicated pliers or a screw-down driver head for consistent pressure rather than hammering or hand-only force. Work in small sections so the mortar has enough open time to allow adjustment yet is still tacky enough to hold position; remove excess mortar from joints so spacers seat correctly. After the mortar cures according to manufacturer recommendations remove caps or unscrew the system and clean residue before grouting to keep joints uniform.

People often underprepare the substrate and try to hide unevenness with thinset which leads to lippage; the fix is to screed and use a leveling compound where needed before tiling. Another common mistake is applying uneven pressure when tightening wedges or caps which can create high spots; use the matching tool and apply steady, consistent force across the field. A third frequent issue is mismatch between spacer base width and grout joint width causing caps to sit improperly; verify the system specification for your planned joint width and test a dry run on scrap tiles to confirm fit.

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