What construction issue is efflorescence an indicator of?

Efflorescence serves as a visible indicator of excessive moisture within masonry materials. This phenomenon occurs when water-soluble salts within the masonry dissolve in water and move to the surface as the moisture evaporates. When the water evaporates, it leaves behind these crystalline salt deposits, which are often seen as white, chalky stains. The presence of efflorescence highlights that there is an ongoing moisture issue, suggesting that rainwater, groundwater, or moisture from other sources is penetrating the masonry. Addressing the underlying issue of excessive moisture is crucial to prevent potential damage to the integrity of the masonry and to maintain the structural soundness of the building.