Famco Flue Liner Replacement Nationwide

Famco Flue Liner Replacement: The Gaithersburg Owner’s Guide

We stock and install Famco-compatible flue liner replacements for most residential models, with typical installed pricing in Gaithersburg running $1,800 to $3,400 depending on diameter, height, and whether the surround needs refractory repair. Most Famco liner jobs we book are completed in a single visit because our crews carry the common diameters - 6-inch, 7-inch, and 8-inch round in both rigid and flexible configurations - on every truck. You’ll usually discover the liner has failed when you notice drafting problems, an odd smell after rain, or your sweep shows you gaps or spalling during the camera inspection.

Call (301) 719-5236

Which Famco Models This Applies To

Famco has manufactured liners under several series names over the years, and the label location matters more than most homeowners realize. On older Famco rigid liners, the specification stamp sits on the top collar or the first accessible joint below the crown - not at the cleanout, where many people first look. We’ve replaced Famco components in systems dating back to the 1980s, including the Famco-R series common in Gaithersburg’s 1970s split-levels and the later Famco-Flex corrugated stainless models.

Here’s how to identify what you have: measure the inner diameter with a tape (not a guess), note whether the liner is rigid segmented pipe or continuous flexible coil, and photograph any stamped code on the collar. The OEM-versus-aftermarket question for Famco specifically comes down to availability. Famco’s own production runs shift, and certain diameters - particularly 7-inch oval-to-round adapters - have intermittent factory lead times. We source equivalent-grade 316Ti stainless from Olympia Chimney and Gelco when Famco OEM stock is back-ordered, and we document the substitution in writing so there’s no confusion about what went into your flue. The alloy spec matters more than the brand stamped on it. 316Ti with a minimum .012-inch wall thickness handles the thermal cycling in Montgomery County’s freeze-thaw winters without the premature corrosion we see in bargain .010-inch substitutes.

Signs Your Famco Flue Liner Replacement Is Failing

• Draft that reverses on windy days. A separated Famco liner joint or cracked segment creates a pressure leak. Combustion gases spill into the smoke chamber instead of rising, and you’ll notice it worst when northwest winds hit Gaithersburg - the pressure differential overwhelms a compromised flue.
• White or orange staining on the exterior masonry. This is efflorescence or rust leaching through mortar joints. It means moisture and acidic condensate are getting past the liner and attacking the brick from inside. In the clay-heavy soils around Montgomery Village, that moisture wicks outward and leaves unmistakable tracks.
• Bits of tile or metal in the firebox after sweeping. Famco rigid liners with degraded refractory surrounds shed material. If your sweep shows you ceramic fragments or stainless flakes, the liner wall is thinning or the surrounding structure has shifted.
• A persistent metallic smell when the fireplace is cold. New stainless liners have a brief break-in odor. A Famco liner that’s been in service for years suddenly smelling sharp or sour indicates creosote acid eating through a pinhole or seam separation - both let combustion byproducts contact the outer wall.
• The sweep’s camera shows a gap or offset at a joint. This is the definitive finding. Famco’s older rigid couplings can back out over decades of thermal expansion, especially if the original installer didn’t use the proper locking band torque. We see this regularly in the Kentlands colonials where the flue runs straight up through two stories of uninsulated chase.

Replacement Cost & What’s Included

Pricing in Gaithersburg breaks down as follows:

The spread depends on three things: liner diameter and whether we need a custom transition, total flue height from firebox to crown, and whether the existing surround has deteriorated enough to require patching before the new liner seats properly. We price this upfront after the camera inspection - the number on the estimate is the number on the invoice. Every Famco liner replacement we install carries our 90-Day Done Right Promise in writing. If the draft doesn’t test properly or a joint settles, we come back. No paperwork to file, no argument.

DIY or Call Us?

There’s a safe middle ground here, and then there’s where sensible people stop.

What you can check yourself: confirm the damper opens fully, look up the flue with a flashlight for obvious gaps or daylight where the liner should be continuous, and verify your chimney cap isn’t clogged with debris. These are visual checks that cost nothing and tell you whether something is obviously wrong.

What you should not attempt: pulling a liner through a tall flue chase, cutting stainless to length, or seating a new liner with proper expansion clearance. The old liner may be wedged by creosote buildup or surrounded by degraded refractory that collapses when disturbed. More critically, a liner installed without proper diameter-to-appliance matching creates carbon monoxide risk - the right part, wrong configuration, is still a dangerous configuration. We’ve re-done three Gaithersburg homeowner liner jobs in the past two years where the installation looked plausible but failed draft testing. One was venting into the attic cavity. If it’s worth heating your home with, it’s worth doing the maintenance correctly.

Call (301) 719-5236 and we’ll walk through what you’re seeing. If it sounds like a liner issue, we’ll book the camera inspection and show you exactly what we find.

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