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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After
Before
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Before
AfterDuraFlex Flue Liner Replacement: The Paterson Owner’s Guide
Replacing a failed DuraFlex flue liner in Paterson typically costs between $2,400 and $4,800 installed, depending on the liner diameter, flue height, and access from the roof. We carry DuraFlex liner components on the truck and can usually complete the tear-out and re-line the same day once we’ve confirmed what you have. Most owners discover the problem after a stove starts drafting poorly, or when a sweep’s camera finds a hole, a separated seam, or rust through the inner wall of a liner that was supposed to last another ten years.
The camera is what tells you the truth here. Corrine Halstead has pulled enough failed DuraFlex sections out of Paterson flues to know that the liner rarely announces itself until it’s already gone. You’ll feel the draft change first, then you’ll smell it, and by the time you see it, the section is already done.
Which DuraFlex Models This Applies To
Most Paterson homes with a DuraFlex liner are running either the standard DuraFlex 316 stainless (the common wood-stove and fireplace insert liner) or the heavier DuraFlex Pro / AL29-4C variant used for higher-efficiency gas appliances and some oil conversions. The way to confirm yours: open the cleanout door at the base of the chimney and look for the printed label. DuraFlex stamps the alloy grade and diameter on the liner body itself - usually visible on the first foot or two above the cleanout.
The one thing that trips people up: DuraFlex liners come in 4″, 5″, 5.5″, 6″, 7″, and 8″ diameters, and the size is not something you can eyeball from the top of the chimney. You have to measure the inside diameter of the existing liner or the appliance outlet. A 6″ liner on a 5.5″ insert collar will never draft right, and we see a surprising number of those mismatches in Paterson row houses near the Great Falls, where somebody lined the chimney twenty years ago to fit whatever stove was on sale that year. When we replace a DuraFlex flue liner we match the liner to the appliance first, then to the existing masonry, not the other way around.
One more gotcha worth knowing: DuraFlex makes both smooth-wall and corrugated liners, and some proprietary connectors fit only the corrugated profile. If you mix a smooth-wall replacement section onto a corrugated original, the band clamps will not seal. That’s the kind of thing that looks right on paper and leaks flue gas in practice.
For high-efficiency gas units with positive flue pressure, DuraFlex Pro is the correct line, not the standard 316. We stock both. We are an independent chimney service company, not affiliated with DuraFlex, but we order through a supply network that includes DuraFlex, HeatShield, and Gelco specifically so we can get the right alloy in the right diameter without markup games.
Signs Your DuraFlex Flue Liner Replacement Is Failing
- Draft that got weak or went completely sideways. A liner with a hole or a separated seam pulls smoke up fine for years, then one day the fireplace starts pushing smoke back into the room. That’s flue gas finding the path of least resistance through a breach, not a weather problem.
- Soot stains above the mantel or on the wall near the chimney. When warm flue gas leaks from the liner into the chimney cavity, it condenses and finds its way through mortar joints and drywall. Stains around the chimney chase are a late-stage sign.
- A rust scale or flaking metal coming down the flue. DuraFlex 316 liners fail from the inside out. Creosote acid eats the inner wall, then the liner gets brittle and flakes. You’ll see small rust-colored chips in the cleanout area or the firebox.
- An overpowering smell even when the fireplace is cold. A compromised liner lets chimney gases and moisture travel backward into the home instead of out. It smells like dead smoke because that’s what it is.
- Your last sweep flagged pitting or sightline issues. If a previous inspection noted “minor corrosion” and nobody followed up, that corrosion didn’t stop. It never does. Paterson’s freeze-thaw winters accelerate any moisture-driven rot in the flue.
BeforeAfterReplacement Cost & What’s Included
Here’s the actual range for DuraFlex flue liner replacement in Paterson, written the way we quote it before anyone comes out:
- Single-story home, straight flue, 6″ liner: $2,400-$3,000 installed
- Two-story home, straight or slight offset, 6″ liner: $3,000-$3,900 installed
- Three-story or steep-pitch roof, larger diameter: $3,900-$4,800 installed
That includes the liner itself, all DuraFlex-compatible connectors, the top plate and rain cap, tear-out of the old liner, and a documented Level 2 camera scan when we’re done. We give you the written price before work starts, in your hand, with the scope and the warranty spelled out. That’s Clause 1 of our Haven Standard: nothing starts until you have the number. And Clause 4 means you get the camera footage afterward, not a technician’s opinion of it.
The price moves based on roof pitch, how much of the old liner has to be cut out in sections, and whether the existing top plate can be reused. Most Paterson chimneys have a straight shot from the crown to the cleanout, but plenty of the older housing stock near the Historic District has slight masonry offsets which slow the pull through and add labor.
The liner itself is not where the money goes. You can buy 25 feet of 6″ DuraFlex online for under $600. You’re paying for the part that’s hard: getting it down the flue straight, sealed right at the appliance collar, and documented. We warranty our DuraFlex flue liner replacement for five years on the installation and the liner itself carries its manufacturer warranty.
DIY or Call Us?
A failed flue liner is not a DIY job, and I’ll be plain about why. This isn’t like swapping a doorknob. You’re opening a flue to remove a liner that is full of creosote and loose flaking metal. The danger is not just the fall if you’re on a roof, it’s that a breached liner already leaked flue gas once, and until it’s out, you don’t know what else it’s been doing to the chimney cavity. Also: pulling a 25-foot corrugated steel liner through a masonry flue with a rope and a helper usually ends with the liner half in, half out, and somebody bleeding.
What you can do safely: open the cleanout at the base and look inside. If you see flaking rust or a hole, call us. If you smell smoke with the damper closed, call sooner. We work cameras before quotes for exactly this. Camera first, quote second, work third, in that order, every time.
If you’re in Paterson and you think your DuraFlex liner is at the end of its life, call (862) 356-5229. We’ll confirm what you have, quote the replacement in writing, and schedule the work.
Key Takeaways
- DuraFlex flue liner replacement in Paterson runs $2,400-$4,800 installed for most homes.
- The correct liner diameter must match the appliance outlet, not the old liner. Mismatches cause draft failures.
- We stock DuraFlex 316 and DuraFlex Pro on the truck, plus HeatShield and Gelco for alternative linings.
- Camera scan before we quote, camera photo record after we’re done, always. It’s been our practice since 2009.
- Written price, written scope, written warranty, before any work starts. That’s how we operate.
FAQs
A straight flue on a standard two-story Paterson home is usually a one-day job, start to finish. Tear-out of the old liner takes an hour or two depending on how badly it’s rusted, then pulling and connecting the new liner is another few hours. We finish with a camera scan and the photo report, then clean up the work area.
If you have offsets, a steep roof, or the old liner was installed incorrectly and needs to be cut out in pieces, it may run into a second morning. You’ll have that written in the scope before we start, not as a surprise after the fact.
In most cases, no. When a section of the liner has rusted through or separated, patching it with sheet metal screws or a band clamp is not a repair. It’s a temporary hold that fails again, usually at the worst time. The only real repair is replacing the compromised section, and with liners that usually means pulling the whole run and dropping a new liner. On heat-exposed stainless that’s been degraded by creosote acid, patching is throwing money into a part that’s already failed.
If a small section near the top is the only issue and the rest of the liner still has its alloy integrity, we’ll tell you that honestly. We have lined sections on older homes that only needed the top few feet replaced. But we won’t tell you a patch is a finished repair, because it’s not.
We keep DuraFlex 316 and DuraFlex Pro liners in the common diameters on hand, plus connectors and caps. If you have an odd diameter, like a 5.5″ unit on an older insert, we’ll order it and have it within a day or two. You don’t need to buy the part yourself, and honestly, we’d rather you didn’t. When homeowners order online, they sometimes end up with a knockoff “compatible” liner that doesn’t meet the same alloy spec.
Everything we install comes through our supply chain so we can stand behind it. If that means waiting two days for the right part, it’s better than installing the wrong alloy in a Paterson flue that gets hammered by heavy snow and wet winters.
Nothing good, and that’s not pressure, it’s just how flue physics works. A liner with a hole vents flue gas into the chimney cavity instead of up and out. Over time, that gas and moisture eats at the mortar, the bricks, and most importantly, whatever is between the chimney and the living space. You risk carbon monoxide entering the house and a chimney fire igniting in the creosote that’s now got an air leak feeding it. Paterson homes with old walls and open joist bays have less separation between liner breach and living space than many homeowners assume.
Get the camera scan. Know what you’re actually looking at. Then decide. Call (862) 356-5229 for a free level one estimate over the phone, and we’ll get you scheduled.
Call Level Two Chimney Paterson
If your DuraFlex flue liner has failed or you’re seeing the signs of a failing one, call us at (862) 356-5229. A live person answers around the clock, not a voicemail. We’ll talk through what you’re seeing, schedule the camera inspection, and give you a written price for the replacement before any work begins. We serve Paterson and the surrounding areas, including a good stretch of the older row houses near the Great Falls, where we know the masonry and the flue conditions well.
Written by Corrine Halstead, Owner, Level Two Chimney Paterson at Level Two Chimney Paterson, serving Paterson and nearby areas.