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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AfterDuraFlex Chimney Cap & Crown in Greenwich: What to Know First
We repair and replace DuraFlex chimney caps and crowns throughout Greenwich as an independent DuraFlex service provider, and the honest answer on cost is this: a DuraFlex cap replacement in Greenwich typically runs $325-$685 depending on flue size and access, while crown repair lands between $395 and $950. Crown coating with a flexible sealant sits at the lower end of that range; a full concrete crown rebuild is the top. Most jobs take two to four hours on site, and we give you a written price before any work starts.
This page is for DuraFlex owners in Greenwich whose cap is rusting through, whose crown is spalling, or who just got a home inspection report that flagged one. If that’s you, call (516) 399-5497 and we’ll schedule the camera down the flue.
How DuraFlex Products Fail - and How We Fix Them
DuraFlex makes solid flue liners, but the cap and crown components sit in Greenwich weather 365 days a year, and we see the same failure patterns repeat across backcountry estates and Cos Cob colonials alike. Here’s what actually breaks, and what we do about it.
- DuraFlex stainless caps rusting at the weld seams. The old-style DuraFlex 316L cap with the mesh sides tends to fatigue at the spot welds after five to seven years of salt air and freeze-thaw cycles. The mesh wasn’t designed for Greenwich’s coastal temperature swings, and once a seam opens, water tracking starts down the flue. We replace with a welded-body cap, not a riveted one, and prime the mounting collar before it goes on.
- DuraFlex crown-to-liner gaps. The crown is the concrete slab that caps the chimney chase, and older installs around Greenwich often used a standard mix that shrinks away from the DuraFlex liner collar. A half-inch gap is enough to let water run between liner and masonry every time it rains. We saw that gap on a Wyndemere Lane job last February - the homeowner had been told the flashing was the problem. It wasn’t. Caulk would just fail again; we properly re-sealed the crown and added a silicone storm collar.
- DuraFlex Flex 316 liner with a cracked ceramic crown. Homes built before 1990 in Greenwich often have the original crown still in place, and a DuraFlex liner retrofit doesn’t touch it. Once that crown develops a fracture, it opens directly into the flue cavity, and the liner below gets rained on from the top down. We patch only when the crack is hairline. Structural cracks mean a crown rebuild, or you’ll be back here in eighteen months.
- DuraFlex AeroCap (if installed) pulling loose in wind. The AeroCap uses a spring-mechanism internal mount, and after a few January nor’easters, the clamp can walk. Homeowners up on Round Hill report rattling. We re-torque, replace the internal clip, and lock the cap so it’s not flapping in the wind during a storm at 2 a.m.
- Multi-flue cap rust-through over the second flue. DuraFlex multi-flue caps span a wide chase, and the frame typically rusts through over the unused flue first because dry, hot flue gases accelerate oxidation on the inside face. A single burn season is enough. We template and install a replacement cap with a cross-brace reinforcement under the center span.
Our DuraFlex Chimney Cap & Crown Process
Here’s what a DuraFlex cap or crown job looks like with us, start to finish.
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The call. You reach a live person at (516) 399-5497. We book a two-hour arrival window and text you when the tech is on the way.
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The camera inspection. We run an NFPA 211 Level 2 camera down the flue before anything else happens. You see the footage, then and there. That photo record is Clause 4 of the Haven Standard, and we’ve done it on every job since 2009.
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What we find, priced in writing. We tell you exactly what the cap or crown needs - not what it might need. Written scope, written price, written warranty. No verbal promises.
- 4
The parts decision. We check if OEM DuraFlex parts are available and honest-priced via our Haven buying network. If OEM is backordered or overpriced, we show you a quality aftermarket option (Olympia, Gelco, Famco) and explain the difference. You choose with the camera footage in front of you.
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The repair. A named tech - background-checked, uniformed, license number on the truck - does the crown work or cap install. Crown repairs get a two-coat application; caps get a storm collar and resealed mounting.
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After-photos, before we leave. We document the finished crown or cap with the same camera, and the Before and After photos become your record. If it’s not right, the 365-Day Done Right Promise means we return.
BeforeAfterWhat DuraFlex Chimney Cap & Crown Costs in Greenwich
Greenwich pricing for DuraFlex cap and crown work breaks down like this, based on what we’ve quoted over the last year across town:
- DuraFlex single-flue cap replacement: $325-$485
- DuraFlex multi-flue cap replacement: $550-$685
- Chimney crown crack repair (patch and seal): $395-$550
- Full concrete crown rebuild: $750-$950
- Crown coating with flexible sealant: $425-$525
The biggest price drivers are flue size, whether scaffolding is needed (some older Greenwich chimneys have tight roof pitches), and whether the crown is patchable or needs a rebuild. Every quote is written, line by line, before work starts - never “call for a quote.” For an exact number on your DuraFlex cap or crown, call (516) 399-5497 and we’ll come camera-first.
Why Greenwich Homeowners Call Level Two Chimney Greenwich for DuraFlex Work
Because we show you the problem before we quote the fix. Corrine Halstead runs the inspection side as a camera-first discipline, and every DuraFlex cap and crown job gets the same standard that’s been running since 2009: a documented photo record on completion, a written price before work starts, and the 365-Day Done Right Promise behind it. If a part fails or a repair doesn’t hold, we make it right.
And if a DuraFlex part is backordered or priced out of line, we work across HeatShield, Gelco, Olympia, Famco, and Copperfield lines through the Haven buying network - so you’re not held hostage by one brand’s supply chain. Written price. Written warranty. It’s the Level Two standard in Greenwich.
FAQs
No, replacing the cap doesn’t void the liner warranty as long as the work doesn’t alter the liner itself. We don’t cut, weld, or modify the DuraFlex liner during cap replacement, and we document that in the photo record - which also protects you if a DuraFlex rep ever asks what condition the liner was in. If your warranty claim is within its coverage window, bring us the documentation and we’ll inspect to the exact standard the warranty wants. Call (516) 399-5497 and we’ll tell you what your liner actually looks like before you file anything.
OEM DuraFlex caps through our Haven buying network typically arrive in three to seven business days. If you need the cap sealed off sooner - a cracked cap leaking into the flue - we can install a temporary rain cover same week, then replace with the permanent cap when it arrives. For exact timing, call (516) 399-5497 and we’ll check live inventory while you’re on the phone.
If the crown has a hairline crack, it can usually wait until the next service. If there’s spalling - concrete flaking off in chunks - or the crack opens wider than a few millimeters, every rain storm is pushing water behind the masonry and toward the liner. In Greenwich, freeze-thaw cycles make that worse. The camera footage tells us which category you’re in. That’s the honest answer, and we’ll show you the frame ourselves. Call (516) 399-5497 for an inspection with photos.
OEM DuraFlex caps are built to DuraFlex’s spec and match the liner system exactly; they’re the safest warranty-preserving choice. Quality aftermarket options from Olympia, Gelco, or Famco often use thicker-gauge metal at the mesh and a better mounting collar - and they’re usually $40-$80 cheaper per flue. We show you both prices in writing and let the camera footage guide the choice. Call (516) 399-5497 and we’ll bring both options to your roof.
Yes, and they’re most of what we see. Older colonials near Cos Cob and backcountry estates both run DuraFlex multi-flue liners, often installed in the 1990s or 2000s. The crown and cap take the most abuse on those systems because they span wider chases with more exposure. We template each flue, weld the cap support where the old frame rusted, and document the entire crown with after-photos. Call (516) 399-5497 and we’ll quote your multi-flue DuraFlex cap in writing.
For a written estimate on any DuraFlex chimney cap or crown work in Greenwich - no pressure, no vague numbers - call (516) 399-5497. The camera doesn’t guess. Neither do we.
Written by Corrine Halstead, Owner, Level Two Chimney Greenwich at Level Two Chimney Greenwich, serving Greenwich and nearby areas.