Damp wall? White stains?Call
the Pros.
Brick isn't the leak. The joint, the caulk, and the ground next to the house are. The National Park Service calls uncontrolled moisture “the most prevalent cause of deterioration” in older buildings9 — and it gets in at the mortar joint and the hairline beside it.10 We close the route, then let the wall breathe.
Family-owned since 1996·Licensed Chicago mason contractor·5.0 on Angi·Warranty-backed work
The fixRepoint the joints, recaulk the openings, turn the downspouts, seal with something that breathes — before the wall starts drying out through your drywall.
The evidence
Not our opinion. Three facts, footnoted — from the EPA, the standard insurance policy form, and the National Park Service.
A good repointing job is meant to last, at least 30 years
National Park Service, Preservation Brief 21
Dry a wet wall within 24 to 48 hours and mold usually won't grow.13 That's the EPA's clock, and it doesn't care how old the house is. Miss the window and the growth goes where nobody looks — inside the cavity, on the back of the drywall.13 A wall that re-wets with every rain never gets the window at all.
The masonry behind all this runs on a longer clock: thirty years, per the Park Service, for a good repointing job.1 The caulking and brick sealer in front of it don't — they're the layer you're supposed to renew, and the one that gets forgotten until the paint bubbles.
Thirty years for the mortar. Forty-eight hours for the drywall. Plan around the shorter one.
Policies are written for sudden, accidental events — the pipe that lets go on a Tuesday. Wear and tear, deterioration, defective maintenance: that's the standard policy form's exclusion list,5 and it's the language a five-summer caulk leak gets read against.
“Wear and tear, marring, deterioration.” Also “faulty, inadequate or defective… maintenance.”
Standard policy form (ISO HO-3)5Generally not covered. Where it is, caps commonly run $1,000–$10,000, varying by company — against $5,000–$15,000 to remediate one wall.11
Insurance Information Institute7A sill plate that stayed wet for years is $12,000–$35,000 to replace.11 Rot is deterioration, and “deterioration” is on the form's exclusion list by name.
Standard policy form (ISO HO-3)5Homeowners insurance typically does not provide coverage for damages due to lack of maintenance from wear and tear.
State Farm, on its own website6
One in 67 insured homes files a water-damage or freezing claim each year — most of them plumbing.12 The slow leak through your caulk usually isn't one of them.
If water does enter the wall from the ground or from the inside of a building, the coating can intensify the damage because the water will not be able to escape.
National Park Service, Preservation Brief 176
Water gets into a brick wall at the joint and the hairline where mortar meets brick.10 Roll a film-forming “waterproofer” over that wall and water still gets in — from the ground, from inside, from the joint the coating didn't fix77 — it just can't get back out.76 Come winter it freezes in place, and the Park Service's word for what happens to the brick face next is “spalling.”76
The Brick Industry Association's order of operations is the same as ours: repair the failed joints, cracks and openings first.77 That's the tuckpointing and caulking; a water repellent comes after, if at all. Skip that step and you've paid for a coating that made the wall worse — and you still have the leak.
Stop the water first. Remove the mold without closing the route and it grows back14 — and you pay for the same wall twice.
Warning signs
Water leaves a trail. Here's what it looks like from the sidewalk, from the basement stairs, and from the couch — and which ones can wait until Saturday.
Efflorescence: salts carried through the brick by water and left behind when it evaporates. It needs three things — salts, water, and a route to the surface — so the stain is a map of where water has been moving.78 The stain is cosmetic. The route isn't.
Find the sourceLook at the caulking at the top and bottom of every window. A bead that's cracked, pulled back, or just gone is an open door for every rain that hits the glass. Cheap to fix. Expensive to ignore.
Recaulk soonA downspout that ends at the wall puts the roof's rain right where brick meets foundation. Start where the water lands — sometimes this is the whole problem.
Fix it this weekendA wall that's wet the day after a storm, or a corner that puddles after rain, is usually water intrusion from outside — grade, downspouts, or open joints at the base of the wall. Illinois's seller disclosure form asks about exactly this.30
Trace the routeBubbling paint, a soft spot, a smell after rain. By the time water shows up inside, it's been running through the wall for a while — and the EPA's list of hidden mold sites is exactly this spot: the wall cavity, the back of the drywall.13
Act nowSpalling: water got inside the brick, froze — expanding 9%17 — and popped the face off. If the wall was waterproofed with a film-forming coating, that's a known cause: the coating traps the water in, and freezing does the rest.76 It didn't stop the leak. It stopped the wall from drying.
Act nowSmall fixes stay small. See how this one grows ›
The diagnosis
A brick wall rarely leaks through the brick. It leaks at the mortar joint and the hairline beside it,10 at failed caulk, and at the ground — and shows up inside months later, where nobody was looking. Five stops, outside to in. Every number is footnoted.
Chart No. 1996-WTR Patient Your wall Presenting Water getting in Attending The Pros
Water gets into a brick wall in two places: the mortar joint, and the bond line where mortar meets brick.10 An open joint is a funnel. Rain hits the face, runs down, and pours straight through into the cavity behind the brick — where it can't evaporate and nobody can see it.
Then winter. Chicago spends roughly 120 days a year at or below freezing.18 Water sitting in that joint expands 9% when it freezes,17 pries the joint wider, and hands next spring's rain a bigger opening. The damage doesn't reset. It compounds.
The fix — grind out and repoint every failed joint before anything gets sealedThe window caulking at the head and sill is the seam between two materials that move differently — brick and a window frame. It's built to flex, and eventually it stops flexing and splits. From then on, every rain that hits the glass runs down to the sill, in behind the frame, and into the wood around the opening.
A split bead is also an air leak. ENERGY STAR puts the average saving from air sealing plus insulation at 15% on heating and cooling.24 The caulk is the cheap layer. It's the one that's supposed to be replaced.
The fix — cut out and recaulk the head, jambs and sill with a sealant made to move — not painter's caulkThere are two kinds of “waterproofer,” and the label won't tell you which one you bought. A water-repellent coating — the breathable brick sealer — keeps liquid water out and lets water vapor pass through the masonry. A waterproof coating seals the surface against both.76 Brick that can't breathe can't dry.
Put a film over a wall that still takes on water — from the ground, from a downspout, from inside — and the National Park Service says the coating “can intensify the damage because the water will not be able to escape.” In cold weather that trapped water freezes, “causing serious mechanical disruption, such as spalling.”76
The fix — a breathable repellent on sound brick, after the joints are fixed — or no coating at allGround that slopes toward the house and a downspout that dumps beside the foundation put water exactly where the wall is weakest — at grade, where brick meets concrete. Deal with where the water lands before you touch anything inside.
It's the cheapest item on this page and the one we find most often. If your problem is a downspout, we'll tell you. It's cheaper than us.
The fix — extend the downspouts and correct the grade away from the foundation — before any sealer, and sometimes instead of oneThis is where the water ends up: the back of the drywall, the base of the wall, the cavity nobody opens. The EPA gives a wet wall 24 to 48 hours to dry before mold usually takes hold,13 and its list of hidden growth sites reads like this diagram — wall cavities and the back of drywall.13
White crust at the base of the wall is efflorescence — the same map of the route from the warning signs above.78 Remove the mold without closing the route and it comes back — that's the EPA and the CDC, not us.14
The fix — close the route outside, dry the cavity, then repair the finish — in that orderThe cascade
Every job below starts the same way: water past a joint, a caulk bead, or a downspout. The only variable is how long it ran. No national guide prints a number for caulking, breathable sealers or a downspout extension worth repeating, so they aren't on the chart. What is here is the masonry that lets the water in, and what the water does next.
The honest version: the top of this chart is genuinely cheap — turn a downspout, recaulk a window, repoint the bad patch. Most of the bottom isn't masonry. It's what water does after the masonry: framing, foundations, and the inside of the wall. Those run to five figures — and the standard policy form is written for sudden, accidental loss, not for what wears out.5
How it works
A free on-site assessment. We walk the wall outside and, if you'll let us, the basement inside, and trace the water from where it shows up to where it gets in — joint, caulk, sill, grade.
Failed joints ground out and repointed to sound depth, matched to your mortar. Old caulking cut out at the windows and doors and replaced with a sealant built to move. Downspouts extended, grade corrected. The route gets closed at the source, because “there is no substitute for proper filling of all mortar joints.”10
Then — and only then — brick sealing that breathes: a water repellent on sound brick, one that sheds liquid water and lets vapor out,76 so the wall dries instead of trapping water behind a film.
Straight answers
Depends entirely on where the water's getting in, so be wary of anyone who quotes it from the truck. Where the fix is the joints, national guides put repointing at about $400–$2,500 per 100 square feet, averaging around $1,450 — roughly $14–$15 per square foot.48 A chimney typically runs $500–$2,500.46 A cracked window sill is about $250–$800 per sill to replace.57
For caulking and breathable sealers we don't have a national figure worth printing, so we won't print one. Those get quoted on your wall, free.
Sometimes, on the right wall, with the right product — and never as the first step. The Brick Industry Association's guidance is that anything failed, missing or disintegrating that matters to the wall's water resistance gets repaired before a water repellent goes on.77 Coat first and you've paid to lock the leak in.
Product matters as much as timing. A water-repellent coating keeps liquid water out but lets vapor pass through; a waterproof coating seals against both.76 The second kind can trap water in the wall, and in a freezing climate the National Park Service says that can spall the brick face.76 We use breathable brick sealers on sound masonry, or nothing.
Spring through fall, when mortar and sealant can cure without freezing. Chicago hits 32°F or below on roughly 120 days a year,18 so the working season has a hard end — and an open joint or a split caulk bead that goes into November spends the winter filling with water that expands 9% every time it freezes.17
If you noticed it this year, get it looked at this year. Downspouts and grading you can fix in any month the ground isn't frozen.
Some of it, yes. Extend the downspouts, fix the grade, run a bead of the right sealant at a window — do it this weekend and we'll cheer. The parts to leave alone are grinding and repointing joints, and brick sealers: the wrong product on the wrong wall is the DIY mistake that ends in spalled brick.76
Can it wait? Not once water's showing up inside. The EPA gives a wet wall 24 to 48 hours before mold usually grows,13 and a wall that re-wets every rain never gets that window. Outside, every freeze pries the opening wider.17 Send us a photo first. It's free.
We're masons, not insurance advisors, so we'll only tell you what the documents say. The standard homeowners form excludes loss caused by “wear and tear, marring, deterioration” and by “faulty, inadequate or defective… maintenance.”5 State Farm puts it plainly: “Homeowners insurance typically does not provide coverage for damages due to lack of maintenance from wear and tear.”6 The Insurance Information Institute says mold is generally not covered, and where it is, caps commonly run $1,000–$10,000 and vary by company.7
Policies are written for sudden, accidental events. Rain working through failed caulk for five summers looks a lot more like the other thing — but that's your agent's call, not ours. Read your policy, ask your agent, then fix the wall, because the wall is the part you control.
The stain itself, no. Efflorescence is salts that water carried through the masonry and left behind when it evaporated. It needs three things — soluble salts, water, and a route to the surface — which makes the stain a map of where water has been moving through your wall.78 Scrub it off and it comes back, because the route is still open.
Find the route, close it, brush the stain off once, and it stays gone. That's the job.
In Illinois, yes, on paper. Sellers fill out a statutory disclosure form that asks about known defects, including “flooding or recurring leakage problems in the crawl space or basement.”30 And in 2025 an Illinois appellate court upheld $104,000 against a seller who had repaired the water damage without finding the source.29
Fixing the stain isn't fixing the leak. Close the route, keep the paperwork, and you've got something to show a buyer instead of something to explain.
Free estimate
Send a photo of where the water shows up — the stain, the damp corner, the flaking brick — and one of the outside wall above it. We'll trace it back, tell you what we see in plain English, and quote it straight. If it's a downspout, we'll say so. We handle masonry waterproofing across Elmhurst, Oak Park, Villa Park, Lombard, Hinsdale and the rest of Chicagoland.