Efflorescence Efflorescence is a white, powdery deposit left on concrete or masonry when water carries dissolved salts to the surface and then evaporates. It is generally a cosmetic condition.
Although efflorescence does not usually weaken concrete, it often indicates that moisture is moving through the material. Identifying the source of water infiltration can help reduce recurring deposits. Cleaning the surface alone may not solve the problem if moisture continues entering the concrete.
Frequently Asked Questions About Efflorescence
What is efflorescence?
A white, powdery deposit left when water carries dissolved salts to the concrete surface and evaporates.
Does efflorescence damage concrete?
Not usually. It is cosmetic, but it signals that moisture is moving through the material.
Why does cleaning it not solve the problem?
Because the deposits return as long as water keeps traveling through the concrete. The moisture source has to be addressed.
What moisture sources are typical?
Poor drainage, saturated base material, leaking downspouts and water wicking up from wet soil beneath the slab.