When water rises through a building’s bricks and mortar, it causes what’s known as rising damp. Along with the moisture, salts such as sulphates, chlorides, and nitrates are transported. These salts often create efflorescence, leaving unsightly marks on walls. In most cases, damp traces can be seen up to one metre above the floor. https://www.damp-solutions.com/types-of-damp/rising-damp/