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 Liner & Rebuild in Leesburg: What to Know First
As an independent DuraFlex service provider, Hearthstone Chimney Co. installs, repairs, and rebuilds DuraFlex chimney liners across Leesburg and Loudoun County. Most DuraFlex liner replacements and partial rebuilds are completed in a single day, with upfront pricing agreed before we start and no surprises on the invoice. We do not sell you a full rebuild when a targeted liner repair will do the job safely.
This page is for Leesburg homeowners who already have a DuraFlex product in their chimney and need straight answers about what is wrong, what it will cost, and who can fix it without cutting corners. If that is your situation, call us at (571) 701-7519. A live person answers, 24 hours a day.
How DuraFlex Products Fail - and How We Fix Them
- DuraFlex SW (Stainless Wall) liners develop seam separation at the flex points where the chimney makes its transition from the smoke chamber to the vertical flue. In Leesburg’s freeze-thaw climate, condensation collects at these low spots, accelerates creosote buildup, and the seam weld eventually cracks. We cut back to sound metal, install a custom-fabricated transition piece, and back it with a DuraFlex-compatible coupling rather than a generic clamp that voids the remaining warranty.
- DuraFlex AL (Aluminum) liners corrode from the inside out in gas applications where the appliance was oversized for the flue or the liner was never properly sized to begin with. The aluminum thins at the top third of the chimney where acidic condensate runs back down. We do not patch aluminum liners, period. We remove the failed section and replace with DuraFlex SW stainless or, if the appliance and budget allow, upgrade to a properly sized system that will outlast the house.
- DuraFlex Pro liners suffer top-end collapse after improper top-sealing with off-brand termination caps or DIY silicone jobs. The Pro’s heavier gauge holds up fine below, but the upper collar deforms when heat cannot escape properly and the liner back-pressure spikes. We replace the damaged upper section with OEM DuraFlex Pro termination hardware, or with a Gelco or Famco cap that matches the Pro’s diameter and draw specifications exactly.
- DuraFlex relining systems settle and pull away from the appliance collar in older Leesburg colonials where the original masonry has shifted over decades. You smell smoke at startup or see staining at the thimble. We do not just push the liner back and hope. We open the smoke chamber, re-anchor the liner with a listed support system, and rebuild the surrounding masonry if the structure has dropped.
- DuraFlex flexible liners kink during rushed installations in chimneys with multiple offsets, especially in the pre-1980s homes common near Morven Park and the historic district. A kinked liner restricts draft, accelerates creosote accumulation, and creates a creosote fire risk. We camera the full run first, identify the pinch point, and either replace with a more appropriately sized DuraFlex liner or, in severe offset cases, recommend a partial rebuild to straighten the flue path.
Our DuraFlex Chimney Liner & Rebuild Process
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Call and schedule. A live person answers, day or night. We ask what you are burning, how often, and what symptoms you have seen. Russell Haines put it this way: “Tell me what you are burning and how often, and I can tell you what your chimney looks like before I even climb up.”
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Level-2 camera inspection. Our technician runs a camera the full length of the flue, photographs every joint, seam, and transition, and delivers a plain-English verdict with the images. You see what we see. Nothing is recommended without evidence you can verify yourself.
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Parts decision. We specify OEM DuraFlex components where the existing warranty or system compatibility requires it. Where the original line is discontinued or an upgrade makes sense, we source quality aftermarket from HeatShield, Gelco, or Olympia Chimney that matches the specification without compromise.
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The repair or rebuild. Background-checked, uniformed technicians complete most DuraFlex liner replacements and partial rebuilds in a single visit. We protect your floors, work with the damper and appliance collar precisely, and do not leave until the system is drawing correctly.
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Post-repair testing. We run a smoke test or draft gauge check, verify clearance to combustibles, and confirm the termination cap is secure and properly oriented for Leesburg’s prevailing westerlies.
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Documentation and guarantee. You receive photos, a written summary, and our 90-Day Done Right Promise in writing. If it is not right, we make it right. No paperwork, no arguing.
What DuraFlex Chimney Liner & Rebuild Costs in Leesburg
These are the ranges we see most often for DuraFlex work in Leesburg homes:
- DuraFlex liner section replacement (localized damage, one story): $1,400 - $2,200
- Full DuraFlex stainless steel liner replacement, standard chimney: $2,800 - $4,500
- DuraFlex liner + partial smoke chamber rebuild: $3,500 - $5,200
- Full chimney rebuild with new DuraFlex liner system: $8,500 - $14,000
What moves the price: chimney height, number of flue offsets, accessibility (steep roof pitches are common in Leesburg’s older neighborhoods), and whether the existing liner can be extracted or must be demolished in place. We give you the full number upfront before booking. Call (571) 701-7519 for a free estimate at your home.
Why Leesburg Homeowners Call Hearthstone Chimney Co. for DuraFlex Work
We have been serving Leesburg and Loudoun County for over 42 years. That means we have worked on chimneys that were lined with DuraFlex in the 1990s, replaced those liners in the 2000s, and are now servicing the second and third generation of installations. We know which DuraFlex series were sold through which local suppliers, what batch issues showed up in certain years, and how to source parts that fit without forcing.
Our 90-Day Done Right Promise is in writing, not a handshake. Our technicians are background-checked and uniformed, not day-labor pickups. And if your DuraFlex system has a complication that calls for a different approach, we carry HeatShield, Gelco, and Olympia Chimney products so we are not stuck waiting on a single brand’s backorder.
Done right - and we stand behind it. A square deal: no surprises on the bill.
FAQs
No, provided the work is performed to DuraFlex’s installation standards and uses listed components. We are an independent DuraFlex service provider, not a factory affiliate, and we follow the manufacturer’s specification sheets precisely so any remaining warranty stays intact. If you have concerns about your specific warranty period, call us at (571) 701-7519 and we will review it with you before any work begins.
Localized seam cracks, collar separation, or top-end damage can often be repaired with section replacement. Widespread corrosion, multiple seam failures, or aluminum liner degradation usually mean full replacement is the safer and more economical long-term choice. Our camera inspection shows you exactly which situation applies to your chimney. Call (571) 701-7519 to schedule - estimates are free.
OEM DuraFlex parts are required to maintain an active manufacturer warranty and for certain Pro-series connections where tolerances are tight. For older discontinued lines, or where the warranty has already expired, we use quality aftermarket from HeatShield, Gelco, or Olympia Chimney that matches the specification. We explain which path applies to your job before you commit.
Most full DuraFlex liner replacements are completed in one day. Jobs involving partial or full chimney rebuild, multiple flues, or significant masonry repair may extend to two days. We tell you the expected duration when we deliver the upfront estimate, and we do not leave your home unsecured overnight.
If the camera shows minor surface corrosion with no breach and the liner is drawing safely, we will tell you so plainly and recommend monitoring. If there is a seam separation, hole, or collapse risk, we recommend addressing it before the next burn season - creosote accumulation and carbon monoxide leakage are real hazards, not scare tactics. We document what we found so you can make an informed decision. Call (571) 701-7519 to discuss your inspection results.
Written by Russell Haines, Owner, Hearthstone Chimney Co. at Hearthstone Chimney Co., serving Leesburg and nearby areas.