Efflorescence
Definition and meaning of Efflorescence in real estate.
Efflorescence is a white, powdery deposit of water-soluble salts that forms on the surface of concrete, brick, stucco, or other masonry structures when moisture evaporates.
In more detail
It occurs when water penetrates concrete or masonry, dissolves natural minerals inside, and then travels to the surface where the water evaporates and leaves the salt behind. While the powder itself is harmless and cosmetic, its presence is a warning sign that moisture is moving through the building envelope.
If left unaddressed, persistent water intrusion can damage mortar joints, rust metal reinforcements, and lead to mold growth. Home inspectors check for this condition in basements and crawlspaces to identify potential drainage or foundation sealing issues.
Key facts
| Category | Property Types & Construction |
|---|---|
| Material affected | Concrete, brick, stone, stucco, and mortar |
| Underlying cause | Moisture migration and salt dissolution |
| Significance | Indicates a moisture or drainage problem |
During a basement inspection, the buyer noticed white efflorescence on the concrete block walls, indicating that rainwater was pooling against the exterior foundation.
Frequently asked questions
Is efflorescence a type of mold?
No, efflorescence is a crystalline salt deposit, whereas mold is a living fungus, though both indicate excessive moisture levels in the area.
How can you remove efflorescence from masonry?
It can typically be scrubbed off with a stiff brush and water, or treated with a mild vinegar solution, but the root water source must be sealed to prevent it from returning.