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.
Before
After
Before
After
Before
AfterDuraFlex Chimney Repair in Denver: What to Know First
We provide independent DuraFlex chimney repair in Denver with written pricing before any work starts and a documented photo record when we’re done. Most DuraFlex liner and chimney repair jobs in the metro area run $680-$2,400 depending on whether we’re addressing localized mortar failure or a full liner reline with masonry restoration. As an independent DuraFlex service provider, we source OEM and quality aftermarket parts through our Haven buying network and back every repair with our 365-Day Done Right Promise.
This page is for Denver homeowners who’ve been told their DuraFlex chimney system needs repair and want the actual price, the actual problem, and the actual documentation before anyone touches their flue. If that sounds like where you are, call (720) 674-7312. A live person answers, 24/7.
How DuraFlex Products Fail - and How We Fix Them
- DuraFlex SW (stainless wall-flex) liner: crevice corrosion at the tee body. Denver’s freeze-thaw cycles push moisture down the flue, and the SW’s single-ply tee connection pools condensate where the flex meets the rigid tee. We see this in Park Hill and Stapleton homes with 6-inch SW installations from 2015-2019. Our fix: pull the tee, inspect the flex tail for pitting with a borescope, and replace with an OEM DuraFlex tee or a HeatShield-compatible fabricated transition if the flex itself is sound. We document the pitting depth with photos before we quote.
- DuraFlex AL (aluminum) liner: premature failure in gas-to-wood conversions. The AL line is rated for gas and oil only, but we’ve found it still in place after homeowners switched to wood or pellet stoves in Berkeley and Regis neighborhoods. The aluminum softens above 1,000°F and can sag or split at the collar. We replace AL with DuraFlex SW or an equivalent 316Ti stainless system, never patch it. The camera doesn’t guess. Neither do we.
- DuraFlex Pro: mortar joint blowout in the surround masonry. The Pro’s heavier wall thickness transmits more vibration to the surrounding wythe during thermal cycling, stressing older Denver brickwork, especially in 1920s bungalows in Highland and Baker. We repoint with Type N mortar matched to the original hardness, not harder Portland mixes that accelerate spalling. Every mortar sample gets a photo for the record.
- DuraFlex relining: improper top termination letting water track behind the surround. The DuraFlex top plate and rain cap must be sealed with high-temp silicone rated to 500°F continuous; standard roof caulk degrades in two Denver summers. We see this on homes near the foothills where wind-driven rain is worse. Our fix: remove the cap, inspect the surround crown for saturation damage, reseat with proper sealant, and replace the cap if the mesh is corroded. We source replacement caps through our Olympia Chimney and Famco supply lines.
- DuraFlex SW connector: fatigue cracking at the appliance adapter. The factory crimp on early SW flex-to-rigid adapters can work loose if the appliance shifts on its hearth pad, common in slab-on-grade homes in Montbello and Green Valley Ranch with seasonal soil movement. We cut back to sound metal, install a new adapter with a reinforced band joint, and support the flex independently of the appliance so the connection doesn’t bear load.
Our DuraFlex Chimney Repair Process
- 1
Call and schedule. A live person answers (720) 674-7312, 24/7. We book a Level 2 inspection with camera scan, not a “sweep and look.”
- 2
NFPA 211 Level 2 inspection on arrival. Our tech runs a borescope the full length of the DuraFlex liner, photographs every joint, tee, and termination, and checks the surround masonry with a moisture meter. You get the photos before we discuss price.
- 3
Written scope and price. We specify OEM DuraFlex parts versus quality aftermarket alternatives from our Haven buying network, explain the trade-off, and deliver one flat price in writing. No work starts until you sign.
- 4
Repair with documented steps. Corrine Halstead and her crew photograph each stage: the exposed damage, the new component seated, the band torque spec, the sealant bead. This becomes your Clause 4 archive.
- 5
Post-repair camera verification and smoke test. We re-run the borescope to confirm clear passage, perform a smoke test per NFPA 211, and log the results.
- 6
Written warranty and 365-Day Done Right Promise. You leave with photos, scope, and warranty in hand. If it’s not done right, we make it right.
Before
AfterWhat DuraFlex Chimney Repair Costs in Denver
| Repair Scenario | Typical Range |
|---|---|
| DuraFlex tee replacement (SW or Pro), localized | $680-$1,150 |
| AL-to-SW liner replacement, gas-to-wood correction | $1,400-$2,200 |
| Repointing and crown seal with DuraFlex top reset | $890-$1,600 |
| Full DuraFlex reline with masonry restoration | $1,800-$2,400+ |
What moves the price: accessibility (steep roof, tight chase), whether the surround masonry needs repointing beyond the immediate repair, and whether we can reuse existing DuraFlex components or need full replacement. We also service HeatShield and Gelco systems, so if your DuraFlex is part of a mixed installation, we price it as one integrated scope, not two surprise invoices.
Every estimate is free. Bring us a competitor’s written quote and we’ll give you a free second opinion. Call (720) 674-7312.
Why Denver Homeowners Call Level Two Chimney Denver for DuraFlex Work
We’ve inspected and documented more than 38,000 chimneys since 2009, and DuraFlex has been a steady share of Denver’s liner market through that run. Our techs know the difference between a SW tee that can be saved and one that’s pitted through, and they know which Denver neighborhoods have the soil movement, the wind exposure, or the vintage brick that changes how you approach the job.
The Haven Standard requires a written price before work starts (Clause 1), verified crews who text when they’re en route, and a photo record on every visit (Clause 4). We don’t deviate for DuraFlex or any other brand. If you also have HeatShield or Gelco components in the system, we source through the same buying network and warranty the integration.
Corrine Halstead grew up in Queens, trained at Apex Technical School in Manhattan on combustion venting and liner systems, and has worked Denver chimneys from Capitol Hill to the brick Victorians along Federal Boulevard. She still shows customers the camera footage herself.
FAQs
No, provided the repair uses DuraFlex OEM parts or equivalent-spec aftermarket components installed per the manufacturer’s clearances and connection methods. As an independent DuraFlex service provider, we follow OEM specs and document every connection so warranty claims remain valid if you ever need them. Call (720) 674-7312 and we’ll review your specific installation year and model.
Most single-component repairs, tee replacements, or repointing jobs finish in one working day. A full AL-to-SW liner replacement with masonry restoration usually needs two days, with the system out of service overnight. We schedule the start date when you approve the written scope, not before.
Yes. We stock common DuraFlex SW tees, adapters, and termination components locally through our Haven buying network, and we maintain relationships with Olympia Chimney and Famco for same-day or next-day specialty orders. If your repair requires a custom-fabricated transition, we build it in-house and photograph the weld.
The borescope tells us. Localized pitting, a single failed joint, or a damaged tee body typically warrants repair. Widespread corrosion, multiple fatigue cracks along the flex length, or AL liner in a wood-burning application means replacement. We show you the camera footage, explain the threshold, and write the price for both scenarios if it’s close. Nothing is recommended without evidence you can see.
A failed DuraFlex liner or damaged surround masonry lets combustion gases, including carbon monoxide, leak into wall cavities or living space, and creosote can accumulate in gaps where it doesn’t belong. In Denver’s dry winters, that also raises chimney fire risk. The repair cost doesn’t go down with waiting; the masonry damage from water intrusion especially worsens through spring thaw. Call (720) 674-7312 for a free estimate and we’ll tell you exactly what’s urgent and what can wait.
Written by Corrine Halstead, Owner, Level Two Chimney Denver at Level Two Chimney Denver, serving Denver and nearby areas.