How Does Efflorescence Removal Work?


Quick Answer

Efflorescence removal involves the application of pressurized water or muriatic acid followed by an alkaline wash to stucco or masonry to remove the salts that appear on the surface of the masonry. According to Delaware Quarries, Inc., sandblasting is a recommendation for efflorescence that does not respond to water or acid.

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Full Answer

For efflorescence to occur, water-soluble salts must be present in the wall, explains Delaware Quarries, Inc. Efflorescence is caused by the movement of water through masonry. This action moves water-soluble salts, which show up as a powdery substance, to the surface of the stucco or masonry. Efflorescence occurs in bricks, concrete blocks and mortar.

According to the U.S. General Services Administration, it is important to remove the salts as soon as they come to the surface, otherwise they calcify and require the use of acids to remove them. Delaware Quarries, Inc. states that efflorescence is more common during high-humidity seasons, and the amount of efflorescence in one wall should decrease every year. The company also points out that reducing the pore size and absorption rate of water of the materials in a wall are the best ways to prevent efflorescence from occurring, although end-users have little control in how the materials are produced.

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