What is the term for the white powder deposit on masonry caused by leaching of water soluble salts?

Efflorescence is the term used to describe the white powdery deposits that commonly appear on masonry surfaces due to the leaching of water-soluble salts. This process occurs when water, often from rain or humidity, moves through the masonry materials and dissolves these salts. As the moisture evaporates from the surface, the salts are left behind, crystallizing into visible white residues.

Understanding efflorescence is crucial for masonry practitioners because it can indicate underlying moisture problems, which, if not addressed, may lead to more severe structural issues over time. Recognizing this phenomenon helps in assessing the health of masonry materials and guides decisions on maintenance or remediation strategies. The other potential answers refer to different concepts related to materials and conditions but do not accurately describe the specific phenomenon associated with the white powder deposits on masonry.