Efflorescence

Efflorescence is a crystalline deposition of salt frequently seen on the surface of concrete, brick and natural stone surfaces. Efflorescence is the white chalky powder that might find on the surface of a concrete or brick wall. Efflorescence alone does not pose a major problem, but it can be an indication of moisture intrusion, which may compromise the structural material. Building materials, such as concrete, wood, brick and stone, are porous materials. The ground in which these materials can come into contact also contain salts. Causes of Efflorescence A soluble salt : A  variety of salts and salt-forming chemicals  can be present in masonry. They include an array of sulphates and silicates and even ordinary table salt, sodium chloride. An alkali, such as calcium hydroxide (lime), can form a salt when exposed to air. Water : Moisture is the medium that carries the salt to the surface of the masonry. Channels :   Concrete  and bricks have microscopic por