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Chimney flashing repair: where a masonry wall punches through the roof

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A large fallen tree trunk resting on an asphalt shingle roof, shingles and decking split open beneath it

What the job involves

Chimney Flashing Repair in Hartford, CT

Step flashing versus counter-flashing

A chimney is not a roof detail so much as a masonry wall that happens to interrupt one. That distinction matters because the flashing around it is really two separate systems meeting at a joint, not one continuous piece of metal doing a single job.

Step flashing belongs to the roof side. It is a stack of individual L-shaped pieces, one per shingle course, each one lapped over the piece below it the same way shingles overlap each other going up the slope. Step flashing's job is to keep water on the roof plane moving downhill past the chimney without letting any of it slip sideways into the gap where brick meets deck.

Counter-flashing belongs to the masonry side. It is set into the chimney itself, above the step flashing, and folds down to cover the top edge of every step-flashing piece it overlaps. Where step flashing sheds water down the roof, counter-flashing's whole purpose is closing the gap directly above it, so water running down the brick face can't get behind the roof-side metal and into the house.

Among the places a roof actually fails, the chimney gets flagged more than almost anywhere else — inspectors cite it, alongside valleys and wall transitions, as one of the most common sources of a leak, more often than shingles that have simply worn out across the field. Most of that comes down to this two-piece handoff. Step flashing and counter-flashing are made, installed, and maintained by different trades on different schedules, and the seam between them is where the two halves of the job most often stop agreeing with each other.

The two pieces are not always even the same metal, which adds a second way for that seam to go wrong. Galvanized steel step flashing paired with a copper or aluminum counter-flashing can set up galvanic corrosion where the two metals touch and stay wet, slowly eating away at whichever one is less noble in that pairing. That failure has nothing to do with the mortar reglet above it — it's a materials mismatch built into the joint from the day it was installed, and it shows up as pitting or thinning metal at the overlap long before either piece looks obviously rusted through.

Why the mortar reglet fails

Counter-flashing has to attach to the chimney somehow, and the standard method is a reglet: a narrow groove cut into a mortar joint, into which the top edge of the counter-flashing is inserted and then sealed or wedged in place. That groove is doing structural work, not decorative work — it is the only thing holding the masonry-side flashing against the brick.

Mortar is porous and it moves with temperature the same way metal does, just on a slower cycle. A freeze-thaw winter drives water into any hairline crack at the reglet, and repeated freezing expands that crack a little further each time. Eventually the mortar holding the counter-flashing loosens enough that the metal pulls slightly away from the masonry, and once there's a gap, water runs straight down the back of the counter-flashing and behind the step flashing it was supposed to protect.

That failure pattern explains a common complaint: a chimney that seems to leak around the flashing even though the step flashing itself, checked on its own, looks intact. The metal isn't necessarily the problem. The mortar holding it in place is what let go first, and no amount of resealing the visible metal joint fixes a reglet that's opened up an inch above it.

The crown at the very top of the chimney is a separate structure from the reglet and fails for a different reason entirely — it's the chimney's own cap, not a joint in its side wall. Our chimney crown repair page covers that failure on its own, since a cracked crown can produce water damage inside the stack that looks a lot like a flashing leak without being one.

Repair versus rebuild

Not every chimney flashing complaint needs the same scope of work. When the failure is isolated to a short stretch of reglet — a few inches of mortar that opened up while the surrounding joint and the step flashing beneath it are still sound — reseating and resealing that section is usually enough. The rest of the system is doing its job; one segment of the masonry-side connection just needs to be redone.

A rebuild becomes the right call when the problem is spread across the whole chimney rather than one spot. Step flashing that has rusted through in multiple courses, counter-flashing that has pulled free along most of its length, or mortar joints that are crumbling generally rather than cracked in one place all point toward removing and reinstalling the full flashing system instead of patching pieces of a system that's failing as a whole. Trying to spot-repair a chimney in that condition tends to mean coming back for the next section within a season or two.

Telling the two apart takes an actual look at the joint, not just a description of where the ceiling stain showed up, since a small reglet gap and a fully deteriorated flashing system can produce a nearly identical drip point inside the house. That look means testing the reglet by hand along its length to see whether the counter-flashing is firmly seated or already working loose, checking the step flashing for pitting or rust-through at the overlaps, and looking for signs of an old sealant patch layered over a joint that was never actually rebuilt. Each of those findings points toward a different scope, and none of them are reliably visible from the ground.

Chimney flashing repair is one entry point into a wider set of repair services — for a fuller sense of how a described symptom gets routed to the right scope of work, our roof repair page walks through that triage from the start.

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Part of our roof repair work — related: roof leak detection, roof leak diagnosis.

Through the year

How Hartford weather changes this job

Winter in Hartford

Ice dams build along the eaves when attic heat melts snow that then refreezes at the colder edge, backing water up under the shingles. Sustained snow load also stresses older framing and flat sections built with a lighter deck.

Spring in Hartford

Freeze-thaw cycling through late winter works ice into small cracks in flashing and sealant, so the first heavy spring rain is usually when a slow leak turns visible. Wind during spring storms lifts shingles that ice already loosened.

Summer in Hartford

UV exposure and heat cycling dry out asphalt shingles faster on south- and west-facing slopes. A roof that looked fine in June can show granule loss and curling edges by August.

Autumn in Hartford

The season for getting ahead of winter — gutters cleared, flashing checked, and a full inspection scheduled before the first hard freeze locks in whatever damage went unnoticed over summer.

What we handle

Roofing services in Hartford

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Where we go

Hartford and the surrounding towns

Hartford is the base; these are the neighboring communities our crews cover.

Hiring in one of these towns?

A separate guide for each town on what to check before you sign with any roofing contractor there — license and insurance, written scope, and what the warranty actually covers.

Straight answers

Common questions about roofing costs and service

What is the best time of year for chimney repair?

Weather matters more than the calendar date. Mortar and reglet sealant both need a certain range of temperature and dryness to cure properly, so a stretch of hard freezes or heavy rain makes a full mortar-and-flashing repair harder to do well, not just less pleasant to schedule. A dry, moderate stretch gives the materials the best chance to set correctly the first time. That said, an active leak doesn't wait for ideal weather — where full mortar work isn't advisable in the moment, a temporary measure to stop water intrusion can still go in regardless of season, with the permanent repair following once conditions allow it.

What is the cheapest month for roofing?

We don't set pricing by calendar month, and we'd be skeptical of anyone who quotes a chimney repair differently in July than in November for the same actual scope of work. What does change with the season is the work itself: mortar and sealant have a real curing window, so a repair scheduled outside that window may cost more in the long run if it has to be redone. The chimney's own condition, not the date on the calendar, is what actually drives the cost of fixing it.

Can an old chimney be repaired?

In most cases, yes, and age alone isn't the deciding factor — condition is. An older chimney with sound brick and mortar generally just needs its flashing and reglet redone the same way a newer one would. Where age starts to matter is when the masonry itself has degraded broadly: spalling brick, mortar that's crumbling rather than cracked, or a stack that's visibly leaning. That's a different, larger scope than a flashing repair, and it's worth having both the roofing side and the masonry itself assessed together before deciding what the chimney actually needs.

Is gutter damage covered by homeowners insurance?

It depends on what caused it. A gutter dented or torn loose by hail or a falling branch during a specific storm is generally treated as sudden damage, which is the category insurers are most willing to cover. A gutter sagging or pulling away from the fascia because the hangers have simply aged out over many years reads as gradual wear instead, and that category is usually excluded. Photographing the damage soon after a storm, and noting the date, gives an adjuster something concrete to evaluate rather than a guess about which category applies.

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