Gelco Flue Liner Replacement Nationwide

Gelco Flue Liner Replacement: The Marietta Owner’s Guide

We stock and install Gelco-compatible flue liner replacement in Marietta for $2,800-$5,200 installed, depending on liner diameter, chimney height, and whether the chase top needs modification. Most Gelco jobs in East Cobb and along Powder Springs Road can be completed in a single day once we confirm the model and flue dimensions. You’ll usually discover the problem during a sweep when the camera shows cracking, delamination, or gaps at the collar joints that weren’t visible from the firebox.

Call (470) 288-2763

Which Gelco Models This Applies To

Gelco flue liners fall into three main series you’ll find in Marietta homes: the original Gelco stainless-steel flexible liners (2005-2015), the Gelco Pro series with reinforced collars (2015-2022), and the current Gelco Ultra with the snap-lock connection system. The critical compatibility gotcha is the collar diameter: early Gelco used a 6-inch standard that measures 5.875 inches actual, while Pro and Ultra shifted to true 6-inch nominal. We’ve seen homeowners order what the box calls “6-inch” only to find a quarter-inch gap that voids the warranty.

To identify your series, check the upper termination cap for a stamped model prefix: GC- for original, GCP- for Pro, GCU- for Ultra. If the stamp is weathered off, measure the liner wall thickness with calipers: original is .006 inch, Pro is .008 inch, Ultra is .010 inch with the ribbed texture. We source Gelco, DuraFlex, and HeatShield equivalents through Haven’s buying network, and we’ll match the spec rather than upsell you to a series you don’t need. Emberly Chimney Cleaners Marietta is an independent service provider, not affiliated with Gelco.

Signs Your Gelco Flue Liner Replacement Is Failing

• White efflorescence or rust streaks on the exterior chimney brick. This means moisture is getting past the liner through cracks or failed collar seals, and in Marietta’s humidity cycles, that moisture carries combustion acids into the masonry. We document this with exterior photos and thermal readings before we quote.
• Flaking metallic debris in the firebox or cleanout. Gelco original series liners are prone to stress corrosion cracking at the flex points, especially where the chimney offsets around a smoke shelf. The flakes are your liner wall literally shedding material.
• Draft problems that worsen on humid days. A compromised liner loses its smooth interior surface; creosote builds in the irregularities, and the reduced diameter can’t maintain proper draw. East Cobb homeowners near the Chattahoochee notice this first in August when the air is heaviest.
• Visible gaps or separation at liner joints visible during inspection. Gelco Pro collars can back out from thermal cycling if the original installer didn’t use the locking tab. The gap dumps exhaust into the chimney cavity, not up the flue.
• A neighbor’s sweep found liner failure in a home built the same year as yours. Marietta’s 1985-2005 construction boom used similar Gelco lots across subdivisions. If the development had one liner issue, we inspect three more on the same street that same month.

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Replacement Cost & What’s Included

The range depends on three factors we measure, not estimate: liner diameter (5.5-inch to 8-inch), total linear feet from firebox to termination, and whether the existing chase top has clearance for the new collar height. We deliver a written price before work starts, with the scope and warranty in the same document - Haven Standard Clause 1. Every job includes the camera-scan documentation required by Clause 4: photos of the old liner condition, the new liner seated at each joint, and the smoke test readings. The 365-Day Done Right Promise covers the installation; the liner itself carries the manufacturer’s warranty, which we register for you.

DIY or Call Us?

There’s a safe middle ground and a hard stop. You can verify your model stamp, measure your flue diameter with a tape, and check the termination cap for obvious corrosion or looseness. What you cannot safely do is work inside the flue or on the roof termination. Gelco liner replacement requires breaking the existing liner free from creosote bonds, often with significant pulling force, then seating the new liner under tension so the collars seal without gaps. A dropped liner or slipped grip means a multi-thousand-dollar extraction, and working at height with stainless steel under tension is where injuries happen.

Camera first, quote second, work third - in that order, every time. Corrine Halstead runs every Gelco replacement estimate with a full NFPA 211 Level 2 inspection, and we don’t start until you’ve seen the photos and signed the written scope. Call (470) 288-2763 to book.

FAQs