Efflorescence presents itself in the form of a powdery, whitish substance that appears on the surface of brick, masonry and concrete. This phenomenon occurs when the mineral salts contained in these elements are dissolved by the water they contain. During its evaporation, the water transports these salts to the surface where they turn into those white deposits.

Efflorescence on masonry elements that’s less than 5 years old represents a normal condition that should fade over time. It is possible to remove the traces of efflorescence on the affected surfaces with a thorough dry brushing followed by a good cleaning using a solution based on hydrochloric acid.

If efflorescence reappears or if it’s a recurrent problem, it may reveal an abnormally high moisture level directly in contact with the brick or masonry elements. Its sources can be numerous: poor evacuation of water behind the masonry, exfiltration of hot and humid air coming from inside the building, the proximity of a source of high humidity, etc. Because they are not easily discernible, these causes can also hide larger problems within the walls that need to be checked before they start affecting the internal components.

The efflorescence speaks to us. It often announces concealed problems which we must not neglect. If you see these white crystals on the surface of a brick or masonry facing, first clean them. If efflorescence returns, seek the advice of a building expert specialized in the building’s outer shell to determine the extent of the problem, the actual causes involved and the corrective actions needed.