Chimney service
Chimney Leak Repair
Water traced to its actual entry point, then sealed there. The stain on your ceiling is rarely underneath the hole.
The stain is not under the leak. That is why so many chimney leaks get fixed twice.
Water enters a chimney at one of five places — the crown, the cap, the flashing where it meets the roof, the mortar joints, or the brick face itself — and then runs down inside the structure until it finds somewhere to appear. It can travel several feet horizontally along a rafter before it drips. So chimney leak repair is a diagnosis job first: a hose test or a level 2 camera trace to find the entry point, and only then the sealing. Anyone who quotes a fix over the phone is quoting for the wrong hole.
Finding it first
Water travels before it shows
Traced with a hose, one section at a time, from the bottom up. The first appearance of water is what identifies the entry point.
On this pageSigns you need this3 sections+2
Signs you need chimney leak repair
A stain on the ceiling near the chimney
The classic and the most misleading. The stain marks where water gave up travelling, not where it got in. Sealing above the stain is the most common wasted repair in this trade.
Water pooling in the firebox after rain
The most direct evidence there is: water is coming down the flue itself. That points at the cap or the crown rather than the flashing.
Rust on the damper or in the firebox
Rust means sustained moisture in a place designed to stay dry. It also means this has been happening for a while, not since the last storm.
White chalky staining on the brick
Efflorescence is salt carried out of the masonry by water moving through it. Harmless in itself, and proof that the wall is wet inside.
A cracked or sloping crown
The crown is the slab that throws rain clear of the brick. Once it cracks, every rainfall runs straight into the masonry underneath it.
Mortar joints you can scrape out
Open joints take water directly into the wall. On an older stack this is often the whole answer, and repointing is the repair.
How the visit works
The same four steps every time, whatever the repair turns out to be.
- 01
Inspection first, always
A look at the crown, cap, flashing and exterior masonry, then the flue, damper and firebox — with a camera where the job calls for a level 2 scan. Whatever needs work gets shown to you, not just described.
- 02
A written estimate before anything
Scope, price and what is not included, in writing. Nothing starts until you approve it, and an emergency is not a reason to skip this step.
- 03
The work itself
Matched materials and the manufacturer's spec, not whatever is on the van. Drop cloths down, and the room left as it was found.
- 04
Verification and a report
A second scan after the work, and written findings you can keep, hand to an inspector, or send to an insurer.
The jobs this actually includes
Not every job on this list is equally urgent, so they are ordered that way. A cracked liner stops you using the fireplace tonight; waterproofing can wait for a dry week.
The job — most urgent first
What it involves
On site
Liner repair where water has got in
Safety repairWater and freeze-thaw crack clay tiles from the inside. If the leak has been running a while, the liner is part of the damage rather than just the route.
On site: 1–2 days
Flashing repair or replacement
Stops waterResealing or replacing the metal where the chimney meets the roof, including the step flashing and counter-flashing tucked into the mortar. This is the single most common entry point on any chimney.
On site: About a day
Crown repair or recast
Stops waterPatching a hairline crack, or casting a new crown with a proper overhang and drip edge. A crown flush with the brick sheds water down the face instead of clear of it, which is a design fault rather than wear.
On site: 1–2 days
Cap fitting or replacement
Stops waterAn open flue takes rain straight down the middle. A stainless cap is the cheapest repair on this list and fixes the leak that puts water in the firebox.
On site: About an hour
Repointing failed joints
Stops waterCutting out washed-out mortar and repointing in a matched mix. On an older stack this is frequently the leak rather than a contributor to it.
On site: 1–2 days
Waterproofing the masonry
PreventiveA breathable sealant once the actual entry point is fixed, so the wall can still dry outward. Applied over an unfixed leak it traps the water inside and makes the damage worse.
On site: Half a day
Times are for the work itself, not for scheduling. Masonry needs roughly 40°F to cure properly, which is what limits this work in a northern winter rather than whether a crew is free.
Why chimney leak repair quotes vary so much
- Which of the five entry points it turns out to be — they are not close in price
- Whether more than one is leaking, which is common on a neglected stack
- Roof pitch and height, and whether scaffolding is needed
- How long the water has been getting in before anyone looked
- Whether interior damage — plaster, framing, the liner — has to be put right too
Fitting a cap or resealing flashing is a few hundred dollars. Recasting a crown or repointing a full stack runs into the low thousands. A leak that has been running for years and reached the framing is a different conversation entirely, which is the real argument for finding it early rather than living with a stain.
The people behind every visit
Founded by Ryan Carter in 2019. Every page you read here is reviewed by Ethan Miller, our chimney specialist. A written estimate before any work, and the findings in writing whether or not anything needs doing.
More about who we are →
The VIO Standard
- A written estimate first
- License and insurance checked
- Nothing starts without your OK
Common questions
Why does my chimney only leak in heavy rain?
Because most entry points need volume or wind behind them. A hairline crack in the crown sheds light rain and takes on driving rain; flashing that has lifted slightly only lets water past when it is being pushed sideways. This is also why leaks appear to fix themselves for a season — the weather changed, not the chimney. A hose test recreates the conditions deliberately, which is how the entry point gets found rather than guessed.
How do you find where a chimney is leaking?
By elimination, from the bottom of the stack upward. Someone runs a hose on one section at a time while someone else watches inside, starting low and working up, so the first appearance of water identifies the section. It is slow and it is the only reliable method. The alternative — sealing everything that looks suspect — costs more and often misses, because the obvious crack is frequently not the one letting water in.
How much does chimney leak repair cost?
It depends entirely on which of the five entry points is at fault, and they are nowhere near each other in price. A cap is the cheapest thing on the list. Flashing is a day. Recasting a crown or repointing a whole stack is into the thousands. That range is exactly why the diagnosis comes first and why a phone quote for a chimney leak is not worth anything.
Is a chimney leak covered by insurance?
Sudden damage usually is — a storm lifting the flashing, a lightning strike, an impact. Long-term water entry from deteriorated mortar or a cracked crown generally is not, because insurers class that as maintenance. What an adjuster will ask for either way is documentation: dated photographs, written findings, and evidence of the condition. That is a good reason to have it looked at and written up even when the repair itself is straightforward.
Can I just waterproof the chimney to stop the leak?
Not on its own, and applied at the wrong time it makes things worse. A breathable sealant sheds rain while still letting the wall dry outward, which is useful after the entry point has been fixed. Sprayed over open joints or a cracked crown, it seals moisture inside the masonry, where it freezes and does more damage than it was meant to prevent. Waterproofing is the last step, never the first.
let's get it on the calendar.
Tell us your ZIP code and what you need. The pro who covers it quotes the job in writing, and nothing starts until you approve the number.