A white, chalky bloom on brick, pavers or concrete is almost always efflorescence — mineral salt carried out of the masonry by moisture. It is not mold, it is not dirt, and on new work it is usually normal. But it is also a signal worth reading, because persistent efflorescence means water is moving through the material.
📞 Call or Text (804) 571-7226 Get a Free Quote Most quotes go out the same day.
What it is and where it comes from
Masonry materials — brick, mortar, concrete, paver base — contain soluble mineral salts. When water moves through the material it dissolves those salts and carries them to the surface. The water evaporates; the salt stays behind as a white powder or crust.
That means efflorescence always tells you two things: there are salts in the material, and water is moving through it. The first is unavoidable. The second is the part worth paying attention to.
New construction versus a real problem
On new work — a paver driveway in Short Pump, a recently built brick veneer in Glen Allen, fresh concrete anywhere — efflorescence is expected. Masonry carries a lot of construction moisture, and it takes a season or two to dry down. This kind typically appears in the first winter or two, gets lighter each year, and stops on its own.
On older masonry that has been dry for years, a new bloom means something changed. Common causes here: a failed gutter or downspout dumping against the wall, flashing that has given up, grade or mulch built up above the damp course, irrigation spraying the wall directly, or a leak inside. Cleaning that off without finding the water source means cleaning it off again next year.
What it is not
- Not mold. Mold is organic and usually green, gray or black. Efflorescence is mineral and white.
- Not a defect in the brick. The salts are inherent to masonry materials.
- Not structural damage in itself — though the moisture causing it can lead to spalling if it freezes inside the material.
- Not the same as lime run, which is a harder calcium carbonate deposit that has already reacted with air and needs a different, more aggressive treatment.
How it is removed
Light efflorescence often comes off with water and agitation. Heavier deposits need a masonry-appropriate acidic cleaner, applied to pre-wetted masonry and rinsed thoroughly — pre-wetting matters, because dry masonry pulls the cleaner deep into the material where it causes staining later.
The two things to avoid: pressure washing it off soft or historic masonry, which erodes mortar and the brick face, and sealing over it. Sealing traps moisture inside the material, and in a Richmond freeze-thaw winter trapped moisture is what causes spalling — the brick face popping off. Breathable masonry needs to release moisture, not have it locked in.
Our approach to masonry is on the brick and historic masonry page, and paver and concrete work is covered on the driveway and concrete page.
Stopping it coming back
- Fix the water first. Gutters, downspout extensions, flashing, and irrigation heads pointed at walls.
- Check the grade. Soil or mulch piled above the damp course is one of the most common causes we see on older Richmond homes.
- Give new masonry time. On a recent installation, patience genuinely is the treatment.
- Do not seal to hide it. If a contractor’s answer to efflorescence is a sealer, get another opinion.
Common questions
Is efflorescence harmful?
The deposit itself is cosmetic. The moisture producing it can be a problem, particularly if it freezes inside the masonry and causes spalling. That is why we treat recurring efflorescence as a symptom worth tracing rather than just a cleaning job.
My new paver driveway is covered in white powder. Is it defective?
Almost certainly not. New pavers and their base carry a lot of moisture, and the bloom is normal for the first season or two. It should get lighter each year and stop.
Can I just seal over it?
No, and please do not. Sealing traps the moisture that is causing it. In our freeze-thaw winters, trapped moisture inside masonry is what causes the brick face to pop off.
Will it come back after cleaning?
On new masonry, probably once or twice more while it dries down, then it stops. On older masonry it comes back until the water source is fixed.
Is white staining on my basement wall the same thing?
Same mechanism, and there it is a clearer warning sign — it means water is moving through the foundation wall. Worth having someone look at drainage and grading rather than just cleaning it.
Can you tell me where the water is coming from?
Often, from what we see on site — a downspout discharging against the wall, mulch above the damp course, a sprinkler head hitting the brick. We are not building inspectors, but we will tell you what we notice.
📞 Call or Text (804) 571-7226 Get a Free Quote Most quotes go out the same day.