Efflorescence in Stucco

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White stains on cement-based stucco/plaster walls is a common occurrence.  These white stains are called efflorescence.  This article will discuss what efflorescence is, what causes efflorescence, and some possible methods to reduce its appearance. 1. What is efflorescence? In the plastering industry, the word “efflorescence” refers to the crystalline deposit, usually white, that may develop on the surface of portland cement plaster walls. Efflorescence is the end result of water dissolving the salts that are naturally present within cement-based products. This salt solution migrates to the finished surface and a salt deposit remains after the water evaporates. Efflorescence often occurs during periods of wet, cold weather and can occur on the surface of any cement-based product such as masonry, concrete,…

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