Gelco Flue Liner Replacement Nationwide

Gelco Flue Liner Replacement: The Kennesaw Owner’s Guide

A Gelco flue liner replacement in Kennesaw typically runs $2,800-$4,500 installed for a standard single-flue chimney, depending on length, diameter, and whether the existing liner is stainless or aluminum. We stock Gelco-compatible replacement liners in common Kennesaw sizes - 6″, 7″, and 8″ diameters - and most replacements are completed in one day. Corrine Halstead and our crew have pulled failed Gelco liners from homes across Kennesaw, from the ranch-style builds near Barrett Parkway to the two-story colonials tucked against Kennesaw Mountain where the clay flues crack every freeze-thaw cycle.

Call (678) 535-2204

Most owners figure out their Gelco liner is shot during a routine sweep or when they spot water stains on the ceiling below the chimney breast. Sometimes it’s a home inspector flagging “recommend evaluation” after seeing daylight through a seam in the liner wall. Either way, the fix is straightforward once you know what you’re looking at.

Which Gelco Models This Applies To

Gelco liners fall into two main series: the original Gelco stainless flexible liners (3003 alloy, .006″ wall) and the later Gelco-Pro line (.005″ wall with corrugated construction). The label is usually stamped on the collar at the top of the liner or on a tag left by the original installer. If you can’t find it, measure the inner diameter at the thimble - Gelco shipped 6″, 7″, 8″, and occasionally 10″ for fireplace inserts in the Kennesaw market.

Here’s where compatibility gets tricky. Gelco used a proprietary top plate and clamp assembly on pre-2010 installs that doesn’t mate cleanly with current DuraFlex or Olympia Chimney hardware. We’ve seen Kennesaw homeowners buy a “universal” replacement online only to find the collar spacing is off by half an inch and the storm collar won’t seat. We source Gelco, DuraFlex, HeatShield, Olympia Chimney, Famco, and Copperfield through Haven’s buying network specifically to keep customer prices honest, and we match the connection hardware to what’s actually in your chase - not what the box claims.

OEM Gelco parts are still available for most series, though lead times stretch to 3-4 weeks for older aluminum models. For stainless installs, we often recommend a quality aftermarket equivalent from Olympia Chimney or DuraFlex that carries the same UL 1777 listing and a longer warranty. We write it down before we ask you to decide anything - the part number, the source, and the installed price, all in writing before we schedule.

Signs Your Gelco Flue Liner Replacement Is Failing

• Water dripping at the cleanout or firebox. Gelco’s corrugated wall can trap condensation against the outer surface, and once the seam seal degrades, water weeps through at the lowest point. In Kennesaw’s humid summers, we see this accelerate after heavy rains when the chimney cap seal gives way first.
• White powder or rust stains on the liner wall visible from below. This is efflorescence and oxidation working from the outside in - a sign the liner’s outer jacket has corroded, usually from acidic condensation in a gas-venting application where the liner was sized too large for the BTU load.
• Spalling brick or deteriorated mortar in the smoke chamber. When a Gelco liner pulls away from the top plate, exhaust gases vent into the chase instead of up the flue. The heat and acids eat the masonry from the inside. We’ve found this in three homes near Kennesaw Mountain National Battlefield Park where the original installers used the wrong top-sealing method for the chimney height.
• Smoke backup or poor draft on startup. A collapsed or separated liner section creates an obstruction. Gelco’s flexible liners can sag over time if the support spacing was too wide during original installation - 6 feet is the max, and we’ve seen 8-foot spacing in older Kennesaw builds.
• Visible gaps or holes in the liner wall on camera inspection. Our camera picks these up as shadow lines or daylight spots. Stainless Gelco liners in Kennesaw’s climate typically last 15-20 years if the appliance is properly matched; aluminum versions often fail at 8-12 years, especially with wood-burning loads.

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Replacement Cost & What’s Included

The range depends on three things: how much of the old liner we have to extract (collapsed sections take longer), whether the top plate and rain cap need replacement too, and if your chimney chase needs reframing to meet current clearances. We deliver a written price, written scope, and written warranty before anyone starts - Haven Standard Clause 1, H.A.V.E.N. “Have it in writing.” Every job includes NFPA 211 Level 2 camera inspection, documented photo record under Haven Standard Clause 4, and the 365-Day Done Right Promise. Materials come from our Haven buying network; we don’t mark up parts separately from labor.

DIY or Call Us?

You can safely check three things from the firebox: shine a flashlight up and look for obvious gaps, note any water stains or debris falling, and verify your cap is still seated. Don’t climb the roof to pull a liner - the chase top is often rotted where you can’t see it, and a failed Gelco liner can have sharp edges or collapsed sections that snag unexpectedly.

Installing a flue liner replacement requires working at height, cutting metal to exact length, and sealing connections to pass pressure testing. The real risk isn’t the work itself; it’s what you don’t know you’re looking at. We’ve found hidden fire damage, improper original clearances, and gas venting cross-connections in Kennesaw homes where the liner “looked fine from below.” Call (678) 535-2204 and we’ll camera-scan it first. The inspection runs $189-$249 depending on accessibility, and if you move forward with replacement, we credit that toward the job.

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