Efflorescence is a white, powdery mineral deposit that forms on the surface of brick, stone, or concrete when water moving through the masonry dissolves salts and leaves them behind as it evaporates.
The white deposit itself is usually harmless, mostly calcium and other soluble salts that wash or brush off. What it tells you matters more: water is actively moving through your masonry, which means there's a path in, whether that's a crack, failed mortar joint, missing flashing, or a wall that's not shedding water the way it should. Efflorescence that keeps coming back after cleaning is a sign to trace the water source, not just scrub the surface again.
Efflorescence shows up more in our winters than in a lot of climates, because the same freeze-thaw cycling that drives water into brick and stone is also what pushes it back out as vapor once temperatures rise. On new construction, some efflorescence in the first year or two is normal as residual moisture from mortar works its way out. On older walls and chimneys, persistent efflorescence usually points to a real leak we need to find and fix, not just weather off.
More masonry vocabulary from the glossary.
The services where this term comes up.
Chelo's Brick & Stone serves Hillsville, Galax, Wytheville, Fancy Gap, and Independence, VA. Call for a straight answer and a free on-site estimate.
