Key takeaways
- Efflorescence is salt left behind when water evaporates.
- It is often harmless but signals moisture.
- Cleaning without fixing the water source is only temporary.
- Avoid harsh acids on old brick.
What it is
Brick, mortar and concrete contain small amounts of soluble salts. When water moves through the masonry and evaporates at the surface, it leaves those salts behind as a white powder. It is common on new masonry in its first year and on any wall that stays damp.
The powder itself is not harmful to the masonry, but it tells you water is moving through the wall.
How to remove it
Light efflorescence often brushes off dry. Heavier deposits can be washed with water and a stiff brush, or with a masonry cleaner chosen for your brick type. Harsh acid cleaners can damage mortar and soft brick, so we test in a hidden spot first.
Rinse thoroughly and let the wall dry before sealing.
Stopping it for good
Find the water source: failed mortar joints, leaking gutters, missing flashing, poor grading or a damp foundation. Fixing those and adding a breathable water repellent usually ends the problem. Without that, the white returns.
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Quick answers
Is efflorescence a sign of structural damage?
Usually not, but it does indicate moisture is getting into the wall. If you also see cracks, spalling or musty smells, have a mason check it.
Will painting hide efflorescence?
Not for long. Moisture will push through the paint and cause it to peel. Fix the cause first.
Ready to talk it through? Get a free estimate or call 615-431-3789.