Sweep & inspection
Caps & crowns
Masonry repairLevel 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 Flue Liner Replacement: The Yonkers Owner’s Guide
We stock and install DuraFlex-compatible flue liner replacement in Yonkers, and the typical installed price runs $1,800 to $3,400 depending on flue height, liner diameter, and access. We carry common DuraFlex liner diameters on the truck, so many replacements can be completed the same day we diagnose the failure. Most Yonkers homeowners discover a liner problem the hard way: rust flakes on the firebox floor, a sudden draft change, or a sweep camera showing a crack that’s been leaking exhaust for months.
Key Takeaways:
- DuraFlex liners in Yonkers typically last 12 to 18 years, shorter if the liner sees high-heat use without annual sweeping
- We write the price before work starts, and every replacement carries our 365-Day Done Right Promise
- You get photos of the failed liner from inside your flue before you spend a dollar
Which DuraFlex Models This Applies To
DuraFlex makes two primary liner systems you’ll find in Yonkers homes: the DuraFlex 304 alloy liners (the original workhorse) and the DuraFlex Pro / 316Ti lines, which hold up better against the acidic condensate that forms when a high-efficiency furnace vents through the chimney. The compatibility gotcha most homeowners hit is the coupler size: DuraFlex uses a proprietary twist-lock coupler, so a generic aftermarket liner section won’t mate to your remaining DuraFlex pipe. If you’re repairing a section rather than replacing the full run, you need DuraFlex couplers or a full-run replacement. A second gotcha: DuraFlex 304 liners are stamped “DF” plus the diameter in inches near the bottom end cap. If you see a label that says “DF-6” you have a 6-inch liner. We’re an independent service provider, not a DuraFlex distributor, which means we’re not incentivized to sell you parts you don’t need.
Styles & brands we work with
Signs Your DuraFlex Flue Liner Replacement Is Failing
- Rust flakes in the firebox or cleanout. This means the inner liner wall is shedding metal from years of moisture and acidic condensate. Once the flaking starts, the liner’s structural integrity is on borrowed time.
- A metallic smell after burning, or heavier than normal creosote inside the flue. Creosote (the flammable tar buildup that makes chimneys a fire risk) accumulates faster on rough, corroded liner walls. The liner is no longer letting exhaust flow cleanly.
- White or dark staining on the exterior chimney chase. Exhaust gasses escaping through a liner breach condense and stain masonry from the inside out. By the time staining shows outside, the breach is well established.
- A sudden draft change: smoke backing into the room or a weak draw. A cracked liner lets room air get pulled into the exhaust stream, disrupting the chimney’s ability to pull smoke out.
- Visible cracks or gaps during a camera inspection. This is the definitive proof. We run a camera through the flue before recommending any liner replacement, and you see the footage with us.
Replacement Cost & What’s Included
In Yonkers, a full DuraFlex flue liner replacement typically lands between $1,800 and $3,400 installed. The spread is driven by three things: flue height (a three-story home near Greystone costs more in liner footage than a single-story in Lincoln Park), liner diameter and alloy (316Ti runs about 15% more than 304), and access (steep roof pitches or chimneys that need a lift add labor). Here’s how that price breaks down:
- DuraFlex liner kit (liner, couplers, top plate, cap): $600 to $1,100 depending on length and diameter
- Labor for the pull-and-install: $800 to $1,400
- Masonry prep, top-seal, and insulation if required: $250 to $600
Every replacement includes a written price before work begins, our 365-Day Done Right Promise in writing, and before-and-after camera photos so you can see with your own eyes that the new liner is seated correctly. If the repair fails within 365 days, the second visit is free. No exceptions, no “act of God” fine print.
See the difference
Before
After
Before
After
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AfterDIY or Call Us?
You can safely do one thing yourself: shine a flashlight up from the cleanout door (if you have one) and look for rust flakes or visible corrosion at the bottom of the liner. Anything beyond that gets dangerous fast. Installing or replacing a flue liner means working at roof height, handling a stainless steel coil that’s under tension, and correctly torqueing coupler connections that, if they fail, leak exhaust gas into your home. Carbon monoxide is odorless and heavier than air: a liner installed slightly wrong is a real hazard, not a theoretical one. This is the kind of job where the cost of the liner is the small part; getting it seated, sealed, and insulated correctly is the entire job. Call us at (914) 233-3156 and we’ll put eyes on it, camera it, and give you a written price before anyone touches a ladder.
FAQs
In Yonkers, a DuraFlex 304 liner that sees regular wood-burning use typically lasts 12 to 15 years before it needs replacement; a 316Ti liner on a gas appliance can reach 18 to 20. Coastal moisture, high-heat wood fires, and skipped annual sweepings shorten that lifespan. Call (914) 233-3156 for an inspection and camera footage showing exactly where your liner stands.
Small breaches in the lower few feet of a DuraFlex liner can sometimes be addressed with a coupler repair or a welded patch, but in most cases a liner with visible cracks or heavy flaking is at the end of its usable life. We’ll show you the camera footage and tell you plainly if a repair buys you real years or just a few months. All repairs come with our 365-Day Done Right Promise in writing.
Most single-flue DuraFlex replacements in Yonkers are completed in four to six hours, including removal of the old liner, prep, installation, and a final camera sweep to document the finished job. Multi-flue chimneys or difficult-access roofs can extend into a second visit, but we’ll tell you the expected timeline before work starts.
We keep common DuraFlex liner diameters (4-inch through 8-inch) and couplers on our service vehicles, so a standard replacement is usually same-day once we’ve confirmed measurements. Non-standard lengths or 316Ti specialty sizes may need a one-to-two-day order, and we’ll tell you that up front rather than charging for a second visit. We also work with HeatShield and Gelco products when a repair approach makes more sense than a full liner replacement.
Ready for a Straight Answer?
If your DuraFlex liner is failing, you don’t need another vague quote or a technician who disappears after the check clears. You need a camera in your flue, photos in your hand, and a price in writing before work starts. That’s exactly how we operate in Yonkers. Call (914) 233-3156 and a live person answers, 24/7, to book a liner inspection. We’ll send a background-checked, uniformed tech with live arrival tracking, and you’ll see the evidence before you sign off on anything. If we wouldn’t leave it on our own fireplace, we’re not leaving it on yours.
Written by Cory Mitchell, Owner, Hadley Chimney Yonkers at Hadley Chimney Yonkers, serving Yonkers and nearby areas.