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 Cleaning & Sweep in Ashburn: What to Know First
As an independent DuraFlex service provider, we clean and sweep DuraFlex chimney liners and venting systems across Ashburn, typically booking within a week during season and always with upfront pricing agreed before we arrive. Most DuraFlex jobs in Loudoun County run $275 to $495 for a full cleaning with Level 2 camera inspection, and we complete the work in a single visit. This page is for homeowners who see the DuraFlex name stamped on their liner or vent connector and want a sweep who understands the difference between a DuraFlex SS series and a DuraFlex SW - because the wrong brush or the wrong diagnosis costs money. Call (571) 701-8135; a live person answers.
How DuraFlex Products Fail - and How We Fix Them
- DuraFlex SS (stainless steel) liner: creosote bridging at flex joints. The SS series uses corrugated interlocked walls that trap more creosote than smooth-wall alternatives, especially at the flex points where the liner navigates offsets in Ashburn’s older brick chimneys. We see this most in the colonials near One Loudoun built in the 1980s and 1990s. Our fix: rotary polypropylene brushing sized to the corrugation pitch, followed by a camera pass to confirm the walls are clean to bare metal. We never use wire brushes on DuraFlex SS; they score the stainless and void any remaining warranty.
- DuraFlex SW (smooth wall) liner: premature soot glazing from slow burns. Ashburn homeowners with EPA-certified inserts often run low, smoldering fires through shoulder season. The SW’s smooth interior sheds dry soot fine, but that same surface glazes hard when moisture and acids sit. We find this in newer builds along Loudoun County Parkway where tight construction limits draft. Our fix: mechanical sweeping with Mylar whips for glazed deposits, then a chemical creosote modifier applied only where the camera shows buildup exceeding 1/8 inch. We document before and after; you see what we saw.
- DuraFlex AL (aluminum) vent connector: corrosion at condensate traps. The AL series is rated for gas venting only, but we still find it misapplied in older Ashburn townhomes where a previous owner swapped from gas to pellet or even wood. Aluminum plus acidic wood flue gas equals pinholing at the low points. Our fix: we red-tag misapplications immediately, show you the camera evidence, and quote a proper DuraFlex SS replacement or a HeatShield cerfractory repair where code allows. We do not clean a liner we know is failing; that would hide the problem.
- DuraFlex termination caps: screen mesh collapse from thermal cycling. DuraFlex OEM caps use a specific stainless mesh count that clogs with Ashburn’s cottonwood fluff in May and June, then warps from the heat of a first fall fire. Homeowners smell smoke or see drafting issues. Our fix: we stock DuraFlex-compatible caps from Famco and Gelco with reinforced mesh frames, or we clean and reset the original if the mesh is still sound. We measure the flue diameter on site; DuraFlex caps are not interchangeable with standard galvanized sizes.
- DuraFlex connector pipe: joint separation from improper support spacing. DuraFlex flexible liner must be supported every 6 feet vertically and at every offset transition. In Ashburn’s taller two-story homes, especially the ramblers south of Route 7, we find DIY or cut-rate installs with supports at 10 or 12 feet. The liner sags, joints separate, and creosote pools at the low spot. Our fix: we clean the pooled section with a controlled solvent soak, then install proper DuraFlex support components from Copperfield or Olympia Chimney supply. The cleaning is only half the job; the liner has to stay where it belongs.
Our DuraFlex Chimney Cleaning & Sweep Process
- 1
Call and schedule. A live person answers, asks the DuraFlex model if you know it, and books a window. We confirm our $89 Seasonal Tune-Up applies to standard DuraFlex sweeps, or we note if you described symptoms pointing to a Level 2 inspection.
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Arrival and protection. Our technician arrives in uniform, lays floor protection from the door to the hearth, and runs a Level 1 or Level 2 inspection per NFPA 211. For DuraFlex systems, we specifically check the manufacturer’s label for series, diameter, and install date.
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Camera diagnosis. Level 2 jobs get a full video scan up the flue. We look for creosote type (powdery, flaky, glazed, or tar-like), joint integrity, and any signs of corrosion or deformation specific to your DuraFlex series. You watch the screen with us; we explain what we see in plain English.
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Cleaning with correct tooling. We select brushes, whips, or solvents matched to your DuraFlex wall type and deposit severity. No wire on stainless. No aggressive scraping on aluminum. The flue doesn’t lie - and neither do we.
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Post-clean verification and documentation. We run the camera again to confirm clean walls and sound joints. You receive photos, our written verdict, and any recommendations with priority rankings: urgent, plan this season, or monitor. Nothing is sold without camera evidence you can see yourself.
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Cleanup, pricing, and guarantee. We vacuum, remove protection, and present the invoice matching the upfront estimate. Every DuraFlex cleaning carries our 90-Day Done Right Promise in writing. If it’s not right, we make it right. No paperwork, no arguing.
What DuraFlex Chimney Cleaning & Sweep Costs in Ashburn
| Service | Typical Range | What Moves the Price |
|---|---|---|
| DuraFlex Level 1 Sweep (standard cleaning) | $275 - $375 | Flue length, accessibility, creosote severity |
| DuraFlex Level 2 Sweep + Camera Inspection | $375 - $495 | Number of appliances, roof access needs, documentation |
| Glazed Creosote Removal (DuraFlex SS/SW) | $150 - $250 add-on | Extent of glazing, chemical treatment cycles needed |
| DuraFlex Cap Replacement (OEM or Gelco/Famco) | $185 - $340 | Flue diameter, mesh specification, height of install |
| Joint Repair / Support Correction | $225 - $450 | Number of supports, liner diameter, access complexity |
Longer flue runs in Ashburn’s three-story homes, steep roof pitches common south of the Dulles Greenway, and heavy creosote from a skipped season all push toward the higher end. We quote the exact number before we start. Call (571) 701-8135 for a free estimate - the number we give is the number on the invoice.
Why Ashburn Homeowners Call Hearthstone Chimney Co. for DuraFlex Work
We’ve been sweeping chimneys in Ashburn since before the town center changed its name, and Russell Haines has run crews through everything from original 1980s DuraFlex installs to last year’s new construction along Loudoun County Parkway. We carry DuraFlex-compatible components from Olympia Chimney and Copperfield, plus HeatShield cerfractory and Gelco hardware when a repair makes more sense than an OEM replacement. Our 90-Day Done Right Promise means if the creosote comes back early or a joint we cleaned develops a leak, we return. In writing, no arguing. Most jobs finish in one visit. A live person answers the phone at midnight on Sunday. That’s not a slogan; it’s how we’ve operated for over 42 years.
FAQs
No, if it’s done correctly. DuraFlex warranties require professional cleaning per NFPA 211 standards and prohibit wire brushing on stainless or aluminum series. We follow manufacturer guidelines, document our methods, and note any pre-existing damage before we start so there’s no dispute. Call (571) 701-8135 if you want us to review your install paperwork before booking.
Check the metal tag at the top or bottom of the liner; DuraFlex stamps the series, diameter, and UL listing. If you can’t read it, we identify the series during our opening inspection in about thirty seconds by the wall pattern - corrugated for SS, smooth for SW, lighter gauge and magnetic for AL. We’ll show you on the camera.
We stock common DuraFlex-compatible caps, supports, and connectors from Famco, Gelco, and Olympia Chimney supply, and we can source OEM DuraFlex components when code or warranty requires them. Most DuraFlex repairs in Ashburn don’t need factory-direct parts; the professional-grade aftermarket equivalents we carry meet the same UL listings and install faster.
Clean it first, inspect it second, then decide. A decade is mid-life for a properly installed DuraFlex SS liner; we’ve cleaned them at thirty years and found sound metal. We replace when the camera shows wall thinning, joint failure, or corrosion beyond repair - never based on age alone. The inspection costs the same either way, and we’ll tell you plainly if replacement is years away.
During burning season (September through March), we typically book within five to seven days. In shoulder season, often sooner. We don’t promise same-day dispatch - a proper DuraFlex cleaning with camera documentation takes time, and we won’t rush what we can’t stand behind. Call (571) 701-8135 to hold a slot; estimates are free.
Written by Russell Haines, Owner & Master Sweep, Hearthstone Chimney Co. at Hearthstone Chimney Co., serving Ashburn and nearby areas.