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.
DuraFlex Fireplace Services in Denver: What to Know First
We provide independent DuraFlex fireplace services in Denver for gas fireplaces, wood-burning units, fireplace inserts, and damper or firebox repairs. Most DuraFlex jobs are diagnosed and quoted within one visit, with a written price delivered before any work starts. We’re not DuraFlex authorized, and we don’t need to be - we source OEM and quality aftermarket parts through our Haven buying network and document every repair with camera footage you’ll see yourself.
This page is for Denver homeowners who’ve found a DuraFlex tag on their fireplace component and want to know whether it can be fixed, what it’ll cost, and whether the fix will outlast the next burning season. If that’s you, call (720) 674-7312. Estimates are free, and we answer live 24/7.
What happens when you call
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A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
How DuraFlex Products Fail - and How We Fix Them
- DuraFlex SW (stainless wall-flex) liner: creosote bridging at the flex joints. In Denver’s dry, high-altitude climate with rapid temperature swings, the corrugations in SW liner collect glazed creosote faster than smooth-wall alternatives. We see this most in wood-burning installs in Baker and Highland, where owners burn pine and compressed logs. Our fix: rotary cleaning with poly or chain whips sized to the corrugation depth, followed by a Level 2 camera scan to confirm the valleys are clean. If the liner has thinned at the flex points, we quote replacement with DuraFlex Pro or a smooth-wall alternative from our Haven network.
- DuraFlex AL (aluminum) liner: premature corrosion in gas fireplace conversions. AL was spec’d for Category I gas appliances, but Denver’s altitude drops combustion efficiency and raises condensation in marginal installs. We find AL liners deteriorated above the smoke chamber in Park Hill and Stapleton homes where original builders cheaped out. Our fix: pull the AL, inspect the surrounding masonry for chloride staining, and replace with DuraFlex Pro stainless or an Olympia Chimney equivalent rated for the actual appliance input. We write the scope before we touch a tool.
- DuraFlex Pro termination caps: wind-driven downdraft and debris infiltration. The Pro cap’s mesh screen is finer than competing brands, which is good for spark arresting but bad when cottonwood seed clogs it in May and June. We’ve pulled caps in Cherry Creek that were 60% blocked. Our fix: clean or replace the cap, and if downdraft persists, we source a Gelco wind-resistant cap or fabricate a custom cricket from Copperfield stock. We show you the blockage on camera before recommending anything.
- DuraFlex insert adaptors: gasket fatigue and smoke spillage. The factory gasket between DuraFlex insert liners and the appliance collar hardens after 5-7 years of Denver’s freeze-thaw cycles. Owners smell smoke at startup or see soot on the hearth. Our fix: replace with OEM DuraFlex gasket kits where available, or fabricate a compression seal from Famco high-temp gasket material. We test with a smoke pencil and draft gauge before we leave.
- DuraFlex chimney relining systems: unsupported horizontal offsets in fireplace conversions. When a DuraFlex liner is pushed through a masonry chimney with an offset, the flex can sag or ovalize if the installer didn’t use support brackets at code spacing. We find this in pre-1950s homes in Capitol Hill and Berkeley where the original flue has a dogleg. Our fix: install DuraFlex support brackets or transition to a rigid stainless section through the offset, documented with pre- and post-install camera runs. Clause 4 of the Haven Standard requires that photo record.
Our DuraFlex Fireplace Services Process

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Call and schedule. A live person answers, checks our calendar, and notes your DuraFlex model if you have it. We text you the assigned tech’s name and photo before dispatch.
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NFPA 211 Level 2 inspection on arrival. Camera down the flue, readings taken, condition documented. Corrine Halstead started this practice in 2009, and it’s now Haven Standard Clause 4. The camera doesn’t guess. Neither do we.
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Written price, written scope, written warranty. Before any work starts, you get a flat price with line items, the exact parts we’ll use (OEM DuraFlex or equivalent from HeatShield, Gelco, or Olympia Chimney), and the 365-Day Done Right Promise in writing. Haven Standard Clause 1: have it in writing.
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Repair or replacement with documented steps. Techs work in uniform, license number visible, with parts sourced through our Haven buying network. We photograph critical stages.
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Post-repair testing and final documentation. Smoke test, draft measurement, and a photo record of the completed work delivered to you. If we converted a wood-burning fireplace to gas, we verify appliance-specific venting with a manometer.
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Cleanup and archive. We leave the work area as found, and your documented record goes into our archive - 38,000+ jobs and counting since 2009.
Before
AfterWhat DuraFlex Fireplace Services Costs in Denver
| Service | Typical Range | What Moves the Price |
|---|---|---|
| DuraFlex liner cleaning (SW or Pro) | $189 - $289 | Height of chimney, creosote class (II vs. III), accessibility |
| DuraFlex AL liner replacement (gas fireplace) | $1,400 - $2,800 | Linear feet, number of offsets, termination type |
| DuraFlex cap/termination repair or replace | $240 - $580 | OEM vs. aftermarket, need for custom fabrication |
| Insert adaptor gasket replacement | $180 - $340 | Parts availability, whether collar needs machining |
| Firebox repair with DuraFlex relining | $2,200 - $4,500 | Extent of firebox rebuild, liner diameter, insulation requirements |
| Fireplace conversion (wood to gas with DuraFlex venting) | $3,800 - $7,200 | Gas line routing, appliance selection, permit requirements |
These are real ranges for the Denver market, based on jobs we’ve completed from Stapleton to Lakewood. The only way to get your exact price is an on-site inspection, which is free. Call (720) 674-7312 to book.
Why Denver Homeowners Call Level Two Chimney Denver for DuraFlex Work

We’ve worked DuraFlex systems in Denver since the brand was common in new construction and retrofits alike. Our techs know the difference between SW, AL, and Pro specifications without checking a cheat sheet, and our Haven buying network stocks parts from DuraFlex, HeatShield, Gelco, Olympia Chimney, Famco, and Copperfield so we’re not waiting on a drop-ship while your burning season starts.
The 365-Day Done Right Promise is stamped on every job. If it’s not right, we make it right. No charge, no argument. And if another company gave you a written estimate that doesn’t sit right, bring it in - our Free Second Opinion is exactly that, free.
Background-checked, uniformed technicians. License number on the page. A text when we’re on the way. Live phone support at 3 AM if your damper won’t open and you smell smoke. That’s the Haven Standard, and it’s how we’ve operated since 2009.
FAQs
No, proper maintenance by a qualified technician does not void your DuraFlex warranty, though using non-OEM parts for covered repairs can complicate claims. We document every part source and keep receipts so you have a paper trail if you need it. Call (720) 674-7312 if you want us to review your warranty terms before we start.
The camera tells us: isolated thinning or a single damaged section can often be spot-repaired or sleeved, but generalized corrosion, multiple perforations, or delamination means replacement. We show you the footage and explain which category you’re in before quoting either option. Estimates are free - call (720) 674-7312.
We stock common DuraFlex caps, adaptors, and gasket kits locally through our Haven network, and we source less common items from regional distributors with 2-3 day turnaround. If your part is backordered, we quote an equivalent from HeatShield, Gelco, or Olympia Chimney that meets or exceeds OEM spec, with your approval in writing first.
NFPA 211 says annually for wood-burning, every two years for gas. In Denver’s high-altitude, dry climate, we see accelerated gasket hardening and cap debris buildup, so we lean toward annual for any actively used fireplace. A Level 2 camera inspection takes about 90 minutes and includes your documented photo record under Haven Standard Clause 4. Call (720) 674-7312 to schedule.
Class III creosote builds silently in SW liners, gas condensation corrodes AL from the inside out, and blocked caps can backdraft carbon monoxide into living space. The risks are real and specific, not theoretical. We find problems at inspection that would have become emergencies by November. The inspection itself is the cheapest part of owning a fireplace. Call (720) 674-7312 for a free estimate.
Ready to see what’s actually going on in your DuraFlex system? Call (720) 674-7312 for a free estimate. We’ll answer live, send you a named tech, and give you a written price before anyone picks up a tool. Every job includes a camera-scan inspection and documented photo record under Haven Standard Clause 4, backed by our 365-Day Done Right Promise.
Written by Corrine Halstead, Owner, Level Two Chimney Denver at Level Two Chimney Denver, serving Denver and nearby areas.





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