What does "lippage" refer to in tile installation?

Lippage refers to the height difference between adjacent tiles in a tiled surface. This defect can occur when tiles are not installed evenly or if there are irregularities in the substrate. When lippage is present, one tile's edge is higher than the edge of a neighboring tile, which can create an uneven surface that is not only visually unappealing but can also pose a tripping hazard. Proper installation techniques, including ensuring a level substrate and using appropriate leveling methods, are critical for preventing lippage. Understanding this concept is essential for anyone involved in tile installation, as it impacts both the aesthetics and functionality of the finished floor or wall.

The other options represent different aspects of tile installation but do not accurately define lippage. For instance, the gap between tiles pertains to grout joints or spacing, while the adhesive refers to the materials used to bond tiles to the substrate, and the overall tile layout relates to the design and arrangement of the tiles, none of which encapsulate the specific issue of height differences that define lippage.