NASCLA Accredited Commercial General ContractorFinishesMedium
A contractor is installing a large format porcelain tile (24"x48") floor in a commercial showroom. The owner's representative emphasizes that any visible lippage between tiles will be unacceptable. Beyond ensuring a flat substrate, what specific installation technique is MOST effective in minimizing lippage with large format tiles?
- AUsing a standard 1/8-inch grout joint for flexibility.
- BEmploying a tile leveling system during installation.
- CBack-buttering each tile with a thin layer of adhesive.
- DSoaking the tiles in water before installation.
Show answer & explanationAnswer & explanation
Correct answer: B. Employing a tile leveling system during installation.
Tile leveling systems use clips and wedges to mechanically hold adjacent tiles at the same plane during adhesive curing, virtually eliminating lippage, which is particularly critical for large format tiles and highly visible installations.
Why the other options are wrong
- A. Grout joint size does not directly prevent lippage; larger joints can sometimes make lippage more visually apparent if not perfectly flat.
- C. Back-buttering ensures full adhesive coverage and bond, but it does not mechanically prevent lippage between tiles.
- D. Soaking porcelain tiles is generally not recommended as they have very low water absorption and it can interfere with adhesive bond.
Tile Leveling System
A system of clips, straps, and wedges used during tile installation to mechanically hold adjacent tiles level and eliminate lippage as the adhesive cures, especially critical for large format tiles.
- Ensures a flush, even surface between tiles.
- Reduces installation time and improves aesthetic quality.
- Essential for large format tiles (LVT) and rectified tiles.
Memory trick: Large tiles, no lippage? Leveling system is the golden ticket.