September 29, 2026 · By Travis Nech
That white, chalky powder blooming across your brick isn't paint. It isn't mold. It's efflorescence — mineral salts being carried to the surface of your masonry by water — and while the powder itself is harmless, the water behind it is telling you something you shouldn't ignore.
What efflorescence actually is
Brick and mortar are porous. When water moves through them, it dissolves soluble salts naturally present in the masonry. When that water reaches the surface and evaporates, it leaves the salts behind as a white crystalline deposit. That's efflorescence.
Think of it like sweat drying on a work shirt — the stain isn't the problem, it's the evidence. The question is never "how do I clean the powder." The question is "where is the water coming from, and where is it going."
The two kinds (and why the difference matters)
Surface efflorescence
A light white haze or powder on the face of the brick, usually in patches. Brushes off dry. This is the common kind, and on its own it's mostly a cosmetic nuisance. But it's still a water report: somewhere, moisture is entering your wall and traveling through it.
Subflorescence (crypto-efflorescence)
The nasty cousin. Here the salts crystallize behind the face of the brick instead of on it. The growing crystals exert pressure inside the masonry and pop the face of the brick clean off. If your brick faces are flaking, scaling, or falling off in thin sheets — especially on the same walls showing white deposits — that's subflorescence doing structural damage while you watch.
Where the water comes from in Texas homes
Nine times out of ten, it's one of these: failed or missing flashing above windows, doors, and at the base of the wall; clogged or overflowing gutters dumping roof water straight down the brick face (we see this constantly on two-story homes around Arlington, Garland, and Mesquite); sprinklers hitting the wall every morning; grade sloping toward the house with flower beds mounded against the brick; or new-construction bloom on fresh brick that fades in a year or two (on a twenty-year-old house, it's not "new construction" anymore).
What to do about it
Step 1: Find the water and stop it.
Walk the wall during or right after a rain. Look at the gutters, the flashing lines, the sprinkler arcs, the grade. Fix the source first — cleaning the powder without stopping the water is mopping while the tap runs.
Step 2: Let the wall dry.
Once the source is fixed, give the masonry a full dry season. A lot of light efflorescence fades on its own once the water stops moving through the wall.
Step 3: Dry-brush what's left.
A stiff dry brush takes off surface deposits. Work dry — wetting the wall just re-dissolves the salts and drives them back in. For stubborn deposits, a masonry-safe cleaner used exactly per the label. Never use muriatic acid on a whim; used wrong, it burns the mortar and stains the brick worse than the efflorescence did.
Step 4: Get the wall checked if brick faces are failing.
If you're seeing spalling, flaking, or scaling along with the white deposits, the damage is happening inside the brick. That's beyond cleaning — the affected units need to be cut out and replaced, and the water path behind them needs to be corrected, or the new brick fails the same way.
What NOT to do
Don't seal over it.
Slapping a waterproof sealer on an efflorescence-covered wall traps the moisture and salts inside. The pressure builds behind the sealer and pops it off — taking brick face with it. Sealers have their place, but only on a dry wall with the water source already fixed.
Don't pressure-wash it away.
A pressure washer drives water deeper into the masonry, dissolves more salts, and guarantees a bigger bloom next month. It can also blast the mortar joints. Dry brush, always.
Don't ignore it for years.
Light surface bloom on one wall is a maintenance note. Heavy deposits across whole elevations, or any spalling, is a repair job that's getting more expensive every wet season.
Frequently asked questions
Is efflorescence dangerous to my health?
No. It's mineral salt, not mold. It won't hurt you — but the moisture behind it can feed mold inside the wall cavity, which is a different problem worth checking.
Will efflorescence go away on its own?
Light deposits often fade once the water source stops. Heavy or recurring bloom won't — it means water is still moving through the wall and the source hasn't been found yet.
Can I just paint over it?
Please don't. Paint traps the salts and moisture behind it. Within a year you'll have blistered, peeling paint over worse efflorescence — and now you've added paint removal to the repair bill.
Does efflorescence mean my foundation is failing?
Not directly. It's a masonry-and-moisture issue, not a foundation issue. But the same poor drainage that feeds efflorescence can also feed foundation movement in our clay soil — so while you're fixing the water, take a look at your grade and gutters for the foundation's sake too.
Do you handle this in my area?
We cover the full DFW metroplex — Dallas, Fort Worth, Arlington, Plano, Irving, Garland, Frisco, McKinney, and everywhere between — plus the Fort Hood corridor: Temple, Belton, Killeen, Harker Heights, Copperas Cove, Waco, and out through Hamilton and Evant ranch country.
Send us a photo — we'll tell you which kind you've got
Snap a picture of the wall — close enough to see the deposits, wide enough to show where on the house it is — and text it over. We'll tell you straight whether it's a brush-off-and-fix-the-gutter situation or something that needs a mason's hands.
📞 Call or text (817) 523-1540 — ask for Cheryl. Free evaluation, honest answer, no pressure.
Cracks are ugly — let Champion Brick Repair fix them right, with mortar matched to your home and a lifetime warranty.
