DuraFlex Flue Liner Replacement Nationwide

DuraFlex Flue Liner Replacement: The Marietta Owner’s Guide

A DuraFlex flue liner replacement in Marietta typically runs $2,800-$5,200 installed, depending on chimney height, diameter, and whether the existing liner pulls out clean or has to be cut out in sections. We stock DuraFlex-compatible liner in 3″, 4″, 5″, 6″, 7″, and 8″ diameters on our Marietta trucks, and most replacements are completed in a single day once the camera inspection confirms the scope. Most homeowners discover the problem during a routine sweep when the camera shows gaps, corrosion, or separation at the collar joints, or when they notice bits of stainless flake in the firebox after a burn.

Call (470) 288-2763

Which DuraFlex Models This Applies To

DuraFlex produces several liner series, and matching the right one matters for warranty and fit. The DuraFlex SW (smooth wall) and DuraFlex HT (high temperature) are the two we see most often in Marietta homes built between 1985 and 2010, especially the brick ranches off Whitlock Avenue and the split-levels around East Cobb. The SW carries a .006″ wall thickness with a corrugated outer layer and smooth inner wall; the HT steps up to .012″ for pellet and oil applications. You will find the series stamp on the top collar or on a tag left at the cleanout during original installation.

We source replacement liner through Haven’s buying network from DuraFlex, Olympia Chimney, and Copperfield. Aftermarket equivalents from Olympia’s ProFlex line meet the same UL 1777 listing and often ship faster, but we will note on your written estimate whether we are quoting OEM DuraFlex or a listed equivalent. The compatibility gotcha: DuraFlex’s proprietary twist-lock collar does not mate with standard snap-lock fittings from other brands without an adapter, and adapters add $180-$240 to the job. We check collar type during the camera inspection so the estimate is final, not a starting point.

Signs Your DuraFlex Flue Liner Replacement Is Failing

• Flakes of stainless steel in the firebox or hearth. DuraFlex liner is 316Ti or 304 stainless, and when the inner wall corrodes through from condensing flue gases, the metal sheds. In Marietta’s humid shoulder seasons, condensation accelerates this. The flakes are your warning that the liner wall is thinning structurally.
• Smoke odor in upstairs rooms when the fireplace is not in use. A separated collar joint or cracked liner section lets downdrafts carry smoke chamber odors into the house. We see this often in taller chimneys on homes near Kennesaw Mountain where wind patterns create negative pressure.
• White or orange staining on exterior brick below the chimney crown. This means flue gases are escaping through a liner breach and condensing inside the masonry. The salts left behind, called efflorescence, point to a liner that is no longer containing the exhaust stream.
• Difficulty starting or maintaining a fire despite dry wood and open damper. A partially collapsed or delaminated liner restricts draft. DuraFlex SW liner can ovalize if a prior chimney fire softened the corrugated outer wall, choking airflow without fully blocking it.
• Your sweep’s camera shows a gap, hole, or joint separation. This is the definitive finding. NFPA 211 requires liner replacement when the camera reveals any breach that could allow combustion products into the structure. We document this with photos and show you the footage before quoting.

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Replacement Cost & What’s Included

The range depends on three things we check during the camera inspection: how many feet of liner we are pulling, whether the existing liner comes out in one piece or has to be sectioned and extracted, and whether the chimney needs insulation to maintain proper clearances to combustibles. We deliver a written price before work starts, Clause 1 of the Haven Standard, and that price includes the liner, all fittings, the top termination, a new bottom connector, and disposal of the old material. Every replacement carries our 365-Day Done Right Promise and a documented photo record under Clause 4.

DIY or Call Us?

There is no safe DIY path for flue liner replacement. The work involves working at height on a pitched roof, handling sharp stainless edges, and ensuring proper clearances to combustible framing, which requires a working knowledge of NFPA 211 and local Marietta amendments. A mismeasured liner cannot be returned once cut, and an uninsulated liner in a chimney that requires it creates a fire hazard you will not discover until the home inspector flags it at resale.

What you can do safely: check your cleanout door for metal debris, note any odors, and verify your damper opens fully. Then call us at (470) 288-2763. We run the camera first, quote second, work third, in that order, every time. Camera first, quote second, work third, in that order, every time.

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