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
After
Before
AfterDuraFlex Chimney Liner & Rebuild in Commack: What to Know First
We’re an independent DuraFlex service provider in Commack, and we do liner replacements, partial rebuilds, and full chimney rebuilds on DuraFlex systems every month. Most liner replacements take one day on-site; a full rebuild with masonry work typically runs two to three days. Pricing is honest and upfront - you’ll get a written number before any work starts, and that number won’t change at the door.
This page is for Commack homeowners who have a DuraFlex liner in their chimney and need to know whether it’s failing, what a rebuild actually involves, and what it should cost here on Long Island. If you’re smelling smoke in the house, seeing flaked metal at the cleanout, or got told by another company that you need a full rebuild, call (631) 502-3612 and we’ll give you a straight answer.
How DuraFlex Products Fail - and How We Fix Them
After nineteen years inside Suffolk County chimneys, we’ve seen the same DuraFlex issues come up again and again. Here’s what actually fails, and what we do about it.
- DuraFlex 316L seam separation at the corrugation points. The 316L alloy is good stainless, but the corrugated seam where the strip locks together is the weak spot. When a liner flexes through an offset or a tight smoke chamber, those seams can start to separate. You’ll see rust staining at the cleanout or smell smoke even when the damper is open. The fix is a full liner replacement - you can’t patch a separated seam and have it hold under heat cycling.
- DuraFlex Pro pinhole corrosion from wet ash sitting in the base. The Pro series holds up fine to flue gases, but if water gets in through a cracked crown and pools around the base of the liner where it meets the tee body, you get pinholes forming from the outside in. We pull the liner, inspect it under light, and when we find pinholes we replace the section - not the whole length if the upper part is still sound. But in Commack, with our wet winters, we usually find enough corrosion to justify a full run.
- DuraFlex SW rigid-to-flex transition failures at the breech. When someone mates a rigid SW section to a flexible DuraFlex run without the proper adapter, the connection loosens under thermal expansion. You’ll hear a rattle during windy weather or see creosote weeping at that joint. We fix it by installing the correct OEM transition adapter and re-securing the joint. It’s a one-visit repair most of the time.
- Crushed flex liner from over-tightening during install. This one’s common enough that we look for it on every inspection. An installer cranks the liner clamps too hard, the corrugations collapse inward, and the flue area drops. Your fire starts to burn lazy, smoke backs up on startup. The fix is a new liner run, installed with a torque spec we’ve learned to respect over hundreds of these jobs.
- Creosote glazing inside DuraFlex corrugations that a brush can’t fully remove. Third-degree creosote is a glaze - it bakes onto the corrugated walls and a standard brush skips over the high points. We use mechanical rotary cleaning followed by a camera check, and if the glaze has compromised the liner wall, we recommend replacement. DuraFlex liners can’t be chemically glazed the way tile can; they need physical removal, and sometimes replacement is the honest call.
Our DuraFlex Chimney Liner & Rebuild Process
Here’s how a DuraFlex job goes from the first call to the final walkthrough.
- 1
The call. You reach a live person - often Wendell himself - and we schedule a visit. No trip charge inside the county.
- 2
The inspection. We run a camera through the flue, check the crown, the flashing, the smoke chamber, and the firebox. You see everything. We don’t hide behind jargon.
- 3
The verdict. We show you the footage and tell you plain what needs doing. If the liner is fine and the issue is elsewhere, we say so. If it does not need doing, I will be the first one to tell you.
- 4
The parts decision. We use OEM DuraFlex components when they’re available and make sense. For some older runs, quality aftermarket parts from brands we trust - HeatShield, Gelco - do the job at a better price. We tell you the trade-off every time.
- 5
The work. Liner out, flue prepped, new liner in. If the crown or masonry needs rebuilding, that happens in the same visit when the scope allows. We keep the roof clean and protect the lawn.
- 6
The test and the promise. We fire the system, run the camera again, and show you the final footage. Then we hand you the 90-Day Done Right Promise in writing. If it’s not right, you call and we come back. No charge.
What DuraFlex Chimney Liner & Rebuild Costs in Commack
Here are the numbers we actually see on Commack jobs. These are ballpark ranges - the written estimate is free and exact.
- DuraFlex liner replacement (single-story, straight flue): $1,800-$2,600
- DuraFlex liner replacement (two-story or offset flue): $2,400-$3,800
- Partial rebuild (crown, top course of brick, flashing): $1,200-$2,500
- Full chimney rebuild from the roofline up: $4,500-$8,500, depending on height and accessibility
- Liner repair (transition adapter, loose joint, minor fix): $250-$600
What moves the price: flue height, roof pitch, whether scaffolding is needed, and whether the crown or masonry is compromised. An offset flue adds labor - the liner has to flex through more. Call (631) 502-3612 for a free estimate at your Commack home.
Why Commack Homeowners Call Top Hat Chimney for DuraFlex Work
We’ve been working these neighborhoods since 1999, and we’ve done enough DuraFlex jobs in the Burr Farms area that we know the chimneys there by sight. Wendell Pike puts his name on every job and runs into you at the hardware store on Saturday. That changes how the work gets done.
Every DuraFlex liner and rebuild we do is backed by the 90-Day Done Right Promise in writing. You get the live person on the phone, the real arrival window, and the price we quoted on the phone - not a penny more when the truck shows up. We’re not married to any brand. If a HeatShield or Gelco system is the better fit for your chimney, we’ll tell you that too. The point is the chimney works. Not that we sold you something.
FAQs
That depends on the liner’s age and the cause of failure. DuraFlex warranties cover manufacturing defects, not installation errors or corrosion from moisture. We’ll help you document the failure and file the claim if it’s valid. What we won’t do is sell you a replacement you don’t need because a claim got denied.
Some repairs make sense. Loose transition adapters, separated joints at the breech, and minor clamp issues are one-visit fixes. A separated seam in the liner body or pinhole corrosion through the wall means replacement. We’ll show you the camera footage and explain why. You’ll never have to take our word on faith; you’ll see it with your own eyes.
Most straight-flue replacements take one day. An offset flue or a crown rebuild adds a day. Full chimney rebuilds from the roofline up run two to three days, weather permitting. We work through the seasons but never in conditions that compromise the mortar or the liner. Commack winters can be rough on fresh masonry - we time the work right.
Often, yes. The crown is what keeps water out of the flue, and a cracked or spalling crown is how most Commack liners die young. If your crown has hairline cracks or is losing its slope, we’ll recommend replacing it at the same time. If it’s solid and shedding water, we’ll leave it alone. You’ll see the condition on camera and decide with the facts in front of you.
Once a year, burn or no burn. Chimneys break in the off-season too - condensation, freeze-thaw cycles, and the occasional bird or squirrel. An annual inspection catches seam separation and corrosion early, when it’s a repair instead of a rebuild. Call (631) 502-3612 and we’ll get you on the calendar.
Call Top Hat Chimney for DuraFlex Work in Commack
If your DuraFlex liner is showing the warning signs, or you’ve just been told you need a rebuild and want a second opinion without the pressure, we’re the crew to call. Free estimate, camera evidence, and a written price before any work starts. Reach us at (631) 502-3612 - a live person answers, and it might well be Wendell.
Written by Wendell Pike, Owner, Top Hat Chimney at Top Hat Chimney, serving Commack and nearby areas.