Famco Flue Liner Replacement Nationwide

Famco Flue Liner Replacement: The Waltham Owner’s Guide

We stock and install Famco-compatible flue liner replacement in Waltham, with most jobs running $2,800-$4,500 installed depending on diameter, height, and whether the existing liner pulls out clean or needs to be cut out piece by piece. Famco’s stainless-steel flexible liners, common in 1980s-2000s Waltham construction, typically show failure after 15-25 years of freeze-thaw cycling through our Massachusetts winters. Most Waltham homeowners discover the problem during a pre-season sweep, when our camera finds gaps between liner sections, corrosion pinholing, or complete separation at the thimble near the appliance connection.

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Which Famco Models This Applies To

Famco manufactured flexible stainless flue liners under several product lines, and matching the right replacement means reading what’s left of the original label. The most common we remove in Waltham are the Famco FL series (FL-5 through FL-8, indicating 5-inch to 8-inch diameter) and the heavier-wall Famco Pro-Flex line, which carries a .006-inch wall thickness versus the standard .004-inch. The label, usually a metal tag crimped near the top termination or a stamped band at the collar, degrades after two decades of acid exposure, so we often measure the inner diameter with a caliper and check the appliance BTU rating to confirm sizing.

OEM Famco liners are no longer manufactured, which is not a problem. We source replacement through Haven’s buying network from Olympia Chimney and DuraFlex, both producing stainless AL-29-4C and 316Ti alloys that exceed original Famco specs for condensing appliance duty. The compatibility gotcha in Waltham’s older stock, particularly near the Newton and Watertown lines, is the Famco proprietary top termination collar with its offset locking tab. Standard Olympia or DuraFlex collars seat differently, so we carry adapter rings on every truck rather than fabricate one on site and bill you for the wait.

Signs Your Famco Flue Liner Replacement Is Failing

• White or orange powder on the liner walls. This is chloride-induced pitting corrosion, accelerated by Waltham’s combination of humid summers and heating-season condensation. The powder is oxidized metal leaving the steel; once it starts, the liner wall thins exponentially, not linearly.
• Water staining on the ceiling below the chimney chase. Famco liners fail at the seam joints first, especially where the flex sections straighten at offsets. Water tracks down the outside of the liner, inside the chase, and finds the drywall before you smell smoke.
• Smoke smell in upper floors when the fireplace is not in use. A separated liner section creates a reverse-flow path. Cold air drops through the gap, carrying creosote odor down. In Waltham’s tight 1920s colonials near Prospect Hill, this often gets mistaken for a draft problem until the camera goes up.
• Chunks of clay tile in the cleanout. If your chimney was originally clay-lined and the Famco liner was a retrofit, liner failure lets moisture reach the old terracotta. Spalling clay drops to the bottom. The clay is a symptom; the liner gap is the disease.
• Carbon monoxide detector alerts near the chimney breast. This is the one that moves the appointment to tomorrow. A perforated or separated liner can leak combustion gases into wall cavities. The detector is doing its job; the liner is not.

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Replacement Cost & What’s Included

What drives the range: height from appliance to top, number of offsets, whether the existing liner pulls out in one piece or sections, and whether the Waltham building inspector wants to see the installation permit (we pull it; it’s included). Every quote is written before work starts, with scope, materials spec, and warranty documented. Clause 1 of the Haven Standard requires it. The 365-Day Done Right Promise covers the installation; the liner itself carries a lifetime warranty through the manufacturer when we register it, which we do.

DIY or Call Us?

There’s a safe middle ground, and then there’s the rest.

What you can check: look up the chimney from the cleanout with a flashlight for obvious gaps, check the metal tag for model numbers, and note any water stains or odors to report. That’s useful information, and it costs nothing.

What goes wrong with DIY flue liner replacement: the old liner is often seized with creosote cement at joints, requiring controlled torque that can damage the surrounding masonry if you guess wrong. The new liner must be sized to the appliance, not the chimney, per NFPA 211, and the termination height above roofline has specific requirements in Waltham’s amended ICC codes. Most importantly, stainless flex under tension can whip during installation; a 20-foot section of 6-inch liner has serious kinetic energy if it slips. We’ve seen cracked crowns and one ER visit from a homeowner who tried to muscle it solo.

We pull the permit, coordinate the inspection, and document the completed work with photos under Clause 4 of the Haven Standard. The camera doesn’t guess. Neither do we. Call (781) 649-9326 when you’re ready for the written price.

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