Level 1 sweep and inspection to the NFPA 211 annual standard - flue, crown, cap, and flashing checked and photographed
Chimney sweep logs do not sweep chimneys. They loosen some creosote - which then falls where a brush and vacuum still have to collect it.
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AfterFast, Reliable Chimney Repair Across Cos Cob
Chimney repair in Cos Cob usually runs between $295 and $1,900 depending on the work, with flashing repair typically costing $425 – $850 and crown repair landing around $500 – $1,200. Most repair jobs we handle in Cos Cob are done in a single visit once we’ve ordered any needed parts. If you’re seeing water streaks on the ceiling near the chimney, crumbling mortar on the crown, or rust-stained flashing, call Flint Chimney Sweep at (830) 251-4560. We’ll send a background-checked, uniformed technician to your Cos Cob home, put the price in writing before any tool comes off the truck, and stand behind the repair with our 365-Day Done Right Promise.
Why Flint Chimney Sweep Is Cos Cob’s Preferred Chimney Repair Company
Cos Cob homeowners call us because we operate on a discipline most chimney companies don’t: the written price comes first, every time. That’s The Garrison Standard, the code every Garrison Partners location follows. Since 2002, Flint Chimney Sweep has been part of that family of independently owned chimney service companies, and the standard hasn’t softened. You know the number before the work starts. The invoice matches. No moving the price at the door.
Our crews in Cos Cob work on shoreline colonials, split-levels off Valley Road, and plenty of older homes around Loughlin Avenue where the chimney is original to the house. Hank Delano leads our team, and every tech who shows up at your door is background-checked and uniformed. You’ll know exactly who’s walking in. Response time to most Cos Cob callouts is within one to three business days for non-emergency repair, and scheduling runs through a live person, 24/7, no voicemail trees.
We’ve earned a strong local reputation in Cos Cob by doing what we say we’ll do: showing up inside the window we give, keeping the job site clean, and putting our guarantee in writing. The Chimney Repair work we do here carries a full year of coverage, and if a covered repair fails within 365 days, we return at no charge. No argument, no re-quote.
Chimney Flashing Repair in Cos Cob
Chimney Flashing Repair in Cos Cob often starts with the same phone call: a homeowner sees water in the attic or a stain on the ceiling and assumes the roof is leaking. The actual culprit, in most of the homes we inspect here, is flashing that has pulled away from the chimney. Cos Cob’s coastal air carries salt that accelerates corrosion on metal flashing, especially where the flashing meets the mortar joints. Once the seal breaks, water works down behind the flashing and into the masonry below it.
Flashing repair in Cos Cob typically runs $425 – $850 depending on how many sides of the chimney need re-sealing and whether the existing flashing can be salvaged or must be replaced. We use Gelco flashing sealant when a re-seal is appropriate, and we replace metal with proper step and counter flashing when the material is too far gone. Either way, the fix is documented: photos before, photos after, and a written warranty.
What a flashing repair actually involves
We cut the old sealant out, inspect the metal for rust-through, and decide on re-seal or replacement. Then we regrind the mortar joint where the flashing seats, set the new material, and seal it. The repair is tested with water before we leave.
When flashing replacement beats re-sealing
If the flashing has rusted through in Cos Cob’s salt air, re-sealant won’t hold for long. We’ll tell you plainly when replacement is the honest fix, and show you the rust in the photo report so you can see it yourself.
Chimney Crown Repair in Cos Cob
Chimney Crown Repair in Cos Cob matters more here than inland, and the reason is straightforward: the crown is the top surface of your chimney, and in Cos Cob it takes a beating every winter. Freeze-thaw cycles crack crowns over time. Salt air corrodes the cap and accelerates spalling. When the crown cracks, water gets into the masonry below, and a homeowner often doesn’t notice until a damp spot appears on an interior wall weeks later.
Crown repair in Cos Cob runs $500 – $1,200 depending on the extent of the cracking and whether we’re sealing hairline fractures or rebuilding the crown surface. We use HeatShield crown repair for most jobs, which lets us restore the crown without a full tear-out when the structure is still sound. Every crown job includes a camera inspection of the flue if there’s any sign water has traveled downward.
Caught early, crown repair saves the rebuild
Most crown cracks in Cos Cob chimneys start small, along the edge where the crown meets the brick. Sealed early, that’s a $500 – $700 fix. Let it go two or three winters, and the same chimney often needs repointing or partial rebuilding, which runs $1,800 and up.
What the crown repair includes
We clean the crown surface, remove loose material, apply the HeatShield repair compound, and slope it properly so water drains away instead of pooling. Then we document the finished crown with photos and include the work in your written warranty.
Trusted Brands We Service in Cos Cob
We work with professional-grade chimney materials from manufacturers that make their specs public, so you can verify quality independently. For Cos Cob homes, that means HeatShield crown repair and Gelco flashing sealant on most exterior jobs, and sometimes Copperfield caps and dampers where salt corrosion has taken out the original hardware. We keep these materials coming through regularly for Cos Cob callouts, which means we’re not waiting on supply delays when your repair is scheduled. Parts get ordered for your specific job, not pulled from whatever is on the truck.
Common Chimney Repair Problems We See in Cos Cob Homes
- Salt-corrosion on flashing and caps. Cos Cob’s shoreline air carries salt that eats through metal flashing faster than you’d expect. We regularly replace flashing on chimneys where the seal failed at the ten-year mark, not the twenty.
- Freeze-thaw crown cracking. Winter moisture settles into crown surface cracks, freezes at night, and widens the gap. By spring, the crown needs more than a surface seal.
- Spalling brick and deteriorating mortar joints. Water intrusion behind the brick face causes the face to pop off in chunks. In Cos Cob, this often shows up on the chimney shoulder where flashing has failed and water has been running into the masonry for months.
- Gaps in older flue liners. Many Cos Cob homes built before the 1980s have clay tile liners with gaps where creosote can seep behind the liner. Only a camera inspection confirms this, and we show you the footage.
Pricing for Chimney Repair in Cos Cob, CT
Repair pricing in Cos Cob runs on a range, because a chimney with a cracked crown is a different job from one that needs flashing replaced and brick repointed. Here’s where things typically land. Flashing repair: $425 – $850. Crown repair: $500 – $1,200. Mortar repointing on a standard Cos Cob chimney: $40 – $70 per square foot. Waterproofing with a breathable sealant: $350 – $650. Partial rebuilding or spalling brick replacement: $1,800 – $3,200 depending on how many courses come out. Full flue relining with DuraFlex: $2,400 – $4,000. Every quote is written and delivered before the repair starts, so the number you approve is the number on the invoice. Call (830) 251-4560 for a free, written estimate.
We Also Serve Cities Near Cos Cob
Our crews work throughout Cos Cob and the surrounding shoreline communities. If you’re in Riverside, Old Greenwich, Greenwich, or Stamford, the same written pricing, the same 365-Day Done Right Promise, and the same live-answer phone line apply. Call (830) 251-4560 and you’ll get a person on the line, not a callback form.
Serving Cos Cob, CT - Our Local Coverage Area
We’re based in the Cos Cob area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs About Chimney Repair in Cos Cob
If water is entering only where the chimney meets the roofline, and the masonry below is still solid, flashing repair is likely the answer at $425 – $850. A full rebuild is only needed when the brick itself has spalled badly, the chimney leans, or the flue liner is compromised. We confirm with a camera inspection and show you the footage before recommending anything. Call (830) 251-4560 for a free estimate.
Yes. Salt air accelerates corrosion on crowns and caps, and when paired with freeze-thaw cycles each winter, Cos Cob crowns tend to fail earlier than inland chimneys. This is why we recommend a visual crown check as part of every inspection, not just when you see a leak. If you haven’t had a crown checked in two years, call (830) 251-4560 and we’ll take a look.
First-degree creosote is fine, sooty residue that brushes off easily during a sweep. Third-degree creosote is a hardened, tar-like glaze that forms when the chimney runs cool, typically in wet or coastal conditions. It is a serious fire hazard and often requires chemical treatment or removal by a professional. We identify what’s in your flue with a camera inspection and give you a straightforward answer. Call (830) 251-4560 to schedule one.
Once a year, and in Cos Cob’s coastal conditions, we recommend a Level 2 camera inspection every year for older chimneys that haven’t been relined. Salt air hides damage until water shows up inside the house. An annual inspection catches flashing failure and crown cracking before they become rebuilds. Call (830) 251-4560 for a written price.
In most cases, yes. If the crown is cracked but the masonry and flue liner below are intact, a HeatShield crown repair at $500 – $1,200 restores it without a full rebuild. We only recommend replacing the chimney when the structure itself is sound-compromised, and we’ll show you exactly why in the camera footage. Call (830) 251-4560 for an honest assessment.
Written by Hank Delano, Owner at Flint Chimney Sweep, serving Cos Cob since 2017.