Dictionary of Moisture Protection & Restoration

Dry joint = Joint without mortar. Dwarf wall = A wall or partition which does not extend to the

ceiling. EBM = Engineered Brick Masonry. Efflorescence =

Powder or stain that forms on mortar, concrete, bricks or stone; usually caused by moisture leaching

out salts from the material in the masonry. The remedy is simple: stop the moisture intrusions and allow the migration of the salts to take place; then remove the efflorescence by dry brushing or scraping. Acid washing the efflorescence will only dilute the salts, forcing them back into the substrate, only to migrate back later on. Expansion joint = A joint or gap between adjacent parts of a building structure or different materials that have different thermal expansion rates. ( see control joint for material movement due to a different cause). Extrados =

The outer curve on a masonry arch; as opposed to intrados.

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