Gelco Flue Liner Replacement Nationwide

Gelco Flue Liner Replacement: The Alpharetta Owner’s Guide

Gelco flue liner replacement in Alpharetta typically runs $2,800-$5,200 installed, depending on liner diameter, chimney height, and whether the chase needs reframing. We stock Gelco-compatible stainless steel liners and connectors for same-week installation in most Alpharetta neighborhoods, including the Webb Bridge Road corridor and Wills Park area. Most homeowners discover the problem during a routine sweep when the camera finds gaps, corrosion scaling, or delamination inside the flue wall that wasn’t visible from the firebox.

Call (678) 679-0171

Which Gelco Models This Applies To

Gelco manufactured several liner series over the years, and the part you need depends on when your system was installed. The Gelco Pro-Flex and Gelco Ultra-Flex stainless steel lines are the most common in Alpharetta homes built between 1995 and 2015, particularly in subdivisions off Windward Parkway and near Avalon. Check the collar plate at the top of your chimney or the connector joint above the firebox for a stamped model number. If the tag is corroded, we measure inner diameter and wall thickness with a flue gauge to match the alloy grade.

We source replacement liners through our Haven buying network from Gelco, DuraFlex, and Olympia Chimney. In most cases we install a new stainless liner rather than trying to match an obsolete Gelco SKU, because modern 316Ti alloy outlasts the original 304-grade material that was standard in the 1990s. The camera doesn’t soften anything, and neither do I: if your existing liner is a transitional size like 5.5-inch oval, we’ll tell you before we quote whether the replacement requires a custom bend or a standard round retrofit.

Signs Your Gelco Flue Liner Replacement Is Failing

• White or orange powder on the liner wall. This is aluminum oxide or iron oxide scaling from moisture reacting with the metal. In Alpharetta’s humid subtropical climate, condensation cycles accelerate this corrosion, especially in chimneys on the north face of the house where the flue stays cooler longer.
• Flaking or delamination visible during inspection. The liner’s inner surface separates in sheets, usually starting at joints or bends. Once delamination begins, the liner’s insulation value drops and creosote adhesion increases, which raises fire risk in a measurable way.
• Smoke odor in upstairs rooms when the fireplace is not in use. A breach in the liner allows exhaust to leak into the chimney cavity and find paths through framing gaps. This is a carbon monoxide pathway, not just a smell issue.
• Water staining on the ceiling near the chimney chase. Failed liner joints or corroded sections let combustion moisture reach the chase interior. In Alpharetta, where summer humidity stays above 70 percent for months, this moisture doesn’t dry out; it rots framing and corrodes the liner from the outside in.
• The sweep finds gaps at the liner joints or a disconnected collar. Thermal expansion and contraction eventually loosen clamped connections. We see this most often in Gelco systems that were top-vented without proper support spacing.

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Replacement Cost & What’s Included

For a typical Alpharetta home with a single-flue chimney between 15 and 25 feet, Gelco-compatible liner replacement runs:

• $2,800-$3,600: Standard 6-inch round, straight run, no chase modification
• $3,400-$4,400: Offset or taller run, new connector, insulation blanket
• $4,600-$5,200: Custom bend, chase reframing, or multi-flue configuration

Every quote is delivered in writing before work starts, per Haven Standard Clause 1. The price includes NFPA 211 Level 2 camera inspection, removal of the failed liner, installation of the new 316Ti stainless liner with proper support and insulation, a new top plate or rain cap, and a documented photo record under Haven Standard Clause 4. Warranty is 20 years on the liner material, one year on labor, backed by our 365-Day Done Right Promise.

DIY or Call Us?

There’s no safe DIY path for flue liner replacement. This is roof work at height, with a liner that weighs 40-80 pounds and must be lowered without kinking or tearing the insulation wrap. More critically, a misaligned liner creates a gap between the flue wall and the liner that becomes a hidden fire or CO pathway. You can’t see that mistake from the firebox, and you won’t know until the next inspection or until something worse happens.

What you can do: check your fireplace damper operation, look for debris or animal nesting at the cap, and note any new odors or draft changes. Then call us at (678) 679-0171. We’ll run the camera, show you the footage, and quote the replacement in writing before anyone touches a tool.

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