1. A layer of weak, fine material (such as cement paste, dust, or sediment) that forms on the surface of concrete, stone, or other materials during curing or weathering.
Usage: technical; construction/masonry term

Examples

• The concrete surface was covered with laitance that needed to be removed before sealing.
• Laitance can reduce the bond strength between concrete and applied coatings.
• Workers scrubbed away the laitance to prepare the stone for polishing.
• The laitance layer formed as water rose to the surface during the curing process.
• Removing laitance is an essential step in concrete finishing and restoration work.