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
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Before
AfterDuraFlex Chimney Liner & Rebuild in Smithtown: What to Know First
We provide independent DuraFlex chimney liner and rebuild service in Smithtown, with most DuraFlex liner replacements and partial rebuilds completed in a single visit after our Level-2 camera inspection. Our upfront pricing means the estimate we give is the number on the invoice, and nothing gets recommended without photo evidence you can see for yourself. If you own a DuraFlex liner in a Smithtown colonial, cape, or ranch and have noticed drafting issues, moisture stains, or a smell of smoke when the fireplace is cold, this page is for you. Call (631) 814-2057 and a live person will pick up, 24 hours a day.
How DuraFlex Products Fail - and How We Fix Them
- DuraFlex SW (Stainless Steel) liners develop seam separation at the flex points. The SW series uses a multi-ply corrugated construction that flexes well for offset chimneys common in Smithtown’s older homes near Caleb Smith State Park Preserve, but after 15-20 years of freeze-thaw cycling against Long Island’s coastal humidity, the longitudinal seams at stress points can open. We cut back to sound material, fabricate a custom transition, and splice in new DuraFlex SW or upgrade to DuraFlex Pro if the flue run has shifted.
- DuraFlex Pro liners suffer premature collar corrosion where they meet the top plate. The Pro series uses a higher-grade alloy, but the factory collar connection can trap condensation from Smithtown’s nor’easter-driven temperature swings. We replace the collar with a marine-grade aftermarket equivalent or source OEM depending on warranty status, and we always inspect the surrounding masonry for spalling before we close up.
- DuraFlex AL (Aluminum) liners in gas applications develop pinholing near the water heater connection. Aluminum flex was sold heavily in the 2000s for Category I gas venting in Smithtown’s split-levels and ranches. The AL alloy reacts with chlorides in combustion condensate, especially where the liner sags slightly from inadequate support. We do not patch aluminum liners; we replace with DuraFlex SW or switch to a rigid PelletVent Pro or equivalent if the appliance allows.
- DuraFlex relining jobs from the 1990s-2000s often lack proper top-sealing termination. Many Smithtown homes got DuraFlex liners dropped in without a proper rain cap or storm collar, or with a generic cap that doesn’t mate to DuraFlex’s corrugation profile. Water runs down the flue, saturates the insulation wrap, and accelerates exterior masonry decay. We install DuraFlex-compatible Gelco or Famco terminations with proper storm collars, and we document the before-and-after with photos.
- DuraFlex liners in exterior chimneys pull away from the thimble during settlement. Smithtown’s clay soils and mature tree root systems shift foundations over decades. The DuraFlex liner, flexible as it is, can separate at the thimble connection where it enters the smoke chamber. We re-establish the connection with a DuraFlex-compatible adapter, seal with high-temp refractory, and recommend masonry stabilization if the surrounding brick shows step-cracking.
Our DuraFlex Chimney Liner & Rebuild Process
- 1
Call and schedule. A live person answers (631) 814-2057, 24/7. We book a Level-2 inspection with camera and photo report.
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Inspection and verdict. Russell Haines or one of our background-checked, uniformed technicians runs a camera the full length of your DuraFlex liner. You see what we see. We deliver a plain-English verdict: repair, replace, or monitor.
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Parts decision. If replacement is needed, we confirm your DuraFlex series and diameter, check OEM availability against quality aftermarket options, and explain the trade-off. We do not install builder-grade substitutes.
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The work. Most DuraFlex liner replacements and partial rebuilds finish in one visit. We protect floors, remove the old liner, install the new with proper supports and insulation per NFPA 211, and seal all connections.
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Testing and documentation. We smoke-test or draft-test the assembly, verify clearances, and photograph the completed work. You get the photos and a written summary.
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The guarantee. Every job 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 Liner & Rebuild Costs in Smithtown
| Service | Typical Range |
|---|---|
| DuraFlex liner repair (collar, splice, or thimble reconnection) | $450 - $850 |
| DuraFlex SW or Pro liner replacement, standard single-flue | $2,800 - $4,200 |
| DuraFlex liner replacement with partial smoke chamber rebuild | $4,500 - $6,800 |
| Full chimney rebuild with new DuraFlex liner (exterior stack, 2-story) | $8,500 - $14,000 |
| Level-2 camera inspection with photo report | $289 - $349 |
What moves the price: liner diameter and length, number of flues, offset complexity, whether the existing DuraFlex can be extracted intact or must be cut out, and the condition of surrounding brick and crown. We give you the full number before we start. Call (631) 814-2057 for a free estimate.
Why Smithtown Homeowners Call Hearthstone Chimney Co. for DuraFlex Work
We’ve been serving Smithtown and Suffolk County for over 42 years. Our technicians know the difference between a DuraFlex SW and a DuraFlex Pro without reading the label, and they know which failures are worth repairing and which are not. We carry HeatShield and Gelco materials as well, so if your DuraFlex job needs a compatible transition or a crown repair alongside the liner work, we don’t subcontract or delay. The 90-Day Done Right Promise is in writing, not a handshake. And when we say we’ll be there, we’ll be there.
Tell me what you see, and I will tell you what it means.
FAQs
DuraFlex warranties the liner itself against manufacturing defects for the stated period, but they do not cover installation errors, chimney fires, or corrosion from improper appliance sizing. As an independent DuraFlex service provider, we can help you determine if your failure qualifies and assist with documentation, but we are not authorized to process claims on DuraFlex’s behalf. Call (631) 814-2057 and we will review your situation.
We stock common DuraFlex diameters and fittings for the SW and Pro series, and we have same-week supplier relationships for less common sizes. Most DuraFlex liner replacements in Smithtown do not wait on parts. If your job requires a special order, we tell you before we book.
Repair makes sense for isolated collar corrosion, a single seam separation, or a loose thimble connection in a liner under 15 years old. Replace if the liner shows multiple failure points, significant corrosion, or if it was installed without proper insulation or support. We show you the camera footage and give our recommendation; you decide. Call (631) 814-2057 for a free inspection.
Most single-flue DuraFlex replacements in Smithtown take four to six hours from setup to cleanup. Jobs involving partial rebuilds of the smoke chamber or crown may extend to a full day. We complete most jobs in a single visit.
Yes. We service and install HeatShield, Gelco, Olympia Chimney, Famco, and Copperfield products, and we often use these for transitions, terminations, or full replacements when they better suit the application. We match the material to the job, not the brand to our inventory.
Written by Russell Haines, Owner, Hearthstone Chimney Co. at Hearthstone Chimney Co., serving Smithtown and nearby areas.