What is the purpose of a tile leveling system during installation?

• A. It measures mortar color.
• B. It marks tile pattern layouts visually.
• C. It is only used for large format tiles.
• D. It helps ensure flat substrate and uniform mortar coverage by pulling tiles to the same plane and reducing lippage.

Answer: (D)

The core idea is controlling the tile plane during install. A tile leveling system acts like a stabilizer that pulls neighboring tiles to the same height, so their faces sit flush with each other. That keeps lippage—the height difference between edges of adjacent tiles—from occurring, which creates a smooth, even surface. By holding tiles in that aligned position, mortar is distributed more evenly under each tile, giving you uniform coverage rather than gaps or excess thickness in places. This is especially helpful with large format tiles, where even small deviations become obvious, but it’s beneficial for any tile layout to produce a flat, stable substrate ready for grout.