Level 1 sweep and inspection to the NFPA 211 annual standard - flue, crown, cap, and flashing checked and photographed
Chimney sweep logs do not sweep chimneys. They loosen some creosote - which then falls where a brush and vacuum still have to collect it.
Before
After
Before
After
Before
AfterDuraFlex Damper Repair: The Los Angeles Owner’s Guide
We stock and install DuraFlex-compatible damper repair parts across Los Angeles, and a typical damper replacement runs $240 to $580 installed, depending on the model and what failed. Most jobs are done the same day we diagnose the problem, since our trucks carry the common DuraFlex sizes and the mounting hardware that goes with them. You’ll usually find the damper has failed one of two ways: the plate warps or seizes up after years of heating and cooling cycles, or the cable assembly snaps at the lever or the connection point. In older LA homes, especially Craftsman bungalows in Silver Lake or the ranch houses out in the Valley, we regularly see dampers that haven’t moved since the Clinton administration. Ruben Castellano, our owner, put it best about what happens when a damper finally gives out: “Tell me what you’re seeing and I’ll tell you what it actually means.”
Which DuraFlex Models This Applies To
DuraFlex makes dampers in several series, and the part you need depends on the flue size and the damper’s placement. The most common units we repair or replace in Los Angeles are top-sealing dampers (the ones with a cap that sits over the chimney crown) and the throat dampers that sit just above the firebox. DuraFlex top-sealing dampers typically match up with flue liners sized 6, 7, or 8 inches, and the part number is usually stamped on the underside of the lid or the base plate. If yours is a throat damper, measure the opening width and length, then check the pivot hardware. The compatibility gotcha to know: DuraFlex top-sealing dampers use a specific mounting ring that some aftermarket replacements don’t match, which can leave a gap at the crown. We carry OEM DuraFlex parts plus a small set of pro-grade aftermarket equivalents we’ve tested in the field, but we’ll always tell you which you’re getting and why. Alcott Chimney Sweep is an independent service provider; we’re not affiliated with DuraFlex directly. We also stock parts for HeatShield and Gelco systems for customers with mixed-brand setups.
Signs Your DuraFlex Damper Repair Is Failing
- The damper lever is stuck or moves without resistance. That means the cable either snapped or disconnected from the plate. Cause: corrosion where the cable meets the pivot, or a broken set screw from repeated torque.
- You feel a cold draft coming down the chimney, even with the damper closed. That means the plate isn’t seating flush. Cause: a warped damper plate from years of expansion and contraction, especially common in LA’s dry heat cycles.
- You can hear water dripping or smell musty air after rain. A top-sealing damper that won’t close completely lets rain run straight down into the firebox. Cause: a failed spring mechanism or a lid that’s cracked at the seam.
- The damper plate is visibly rusted or crumbling at the edges. Rust that’s flaking off means the metal has lost its integrity. Cause: years of exposure to moisture and creosote acids, made worse by the marine layer in LA’s coastal neighborhoods.
- You find small pieces of metal or cable in the firebox. That’s not debris from a log. Cause: the cable assembly or pivot bracket has broken off entirely, which means the damper needs a full replacement, not a patch.
Replacement Cost & What’s Included
A DuraFlex damper replacement in Los Angeles typically costs $240 to $580 installed. The range depends on three things: the damper’s diameter, whether it’s a top-sealer or a throat mount, and how much of the old hardware has to be cut out and rebuilt. A basic throat damper swap with a compatible DuraFlex plate and new cable runs at the lower end. A full top-sealing damper with a new mounting ring, crown sealing, and cable replacement runs at the higher end. You’ll get a written price before any work starts, with parts and labor listed separately so there are no surprises. Every repair comes with our written guarantee. If it fails within 365 days, we come back and make it right at no charge. That’s the Done Right Promise, and it’s on every job we do in Los Angeles.
DIY or Call Us?
You can safely check a few things yourself. Look at the damper plate with a flashlight and note whether it opens and closes smoothly. Check the cable for kinks or fraying, and make sure the lever isn’t rusted in place. But replacing a DuraFlex damper part is not a simple weekend project, and for top-sealing dampers, it means working at height on the chimney crown, which is genuinely dangerous. You’re also dealing with a tensioned cable assembly that can snap back if you release it wrong. We strongly recommend a trained professional for any damper replacement that involves the roof or the cable mechanism. Call us at (336) 863-3889 and we’ll walk through what you’re seeing over the phone. If it’s something simple, we’ll tell you so, and we won’t book a visit you don’t need.
FAQs
A DuraFlex damper typically lasts 12 to 18 years in Los Angeles, though top-sealing dampers near the coast often age faster because salt air accelerates corrosion on the metal components. The dry heat and marine layer mix means the plate warps sooner than it would in a colder climate. If yours is over 12 years old and showing rust or play in the cable, it’s usually worth replacing before it fails completely. Call (336) 863-3889 for a free estimate and we’ll tell you honestly whether it’s time.
Sometimes, yes. If the only problem is a broken cable or a loose pivot bracket, we can often replace just that part and have the damper working the same day. But if the plate itself is warped or rusted through, a repair won’t hold and a replacement is the honest call. We’ll show you the damaged part before we recommend anything, and you’ll always have a written price before work begins. We don’t recommend replacement without evidence you can see yourself.
Most DuraFlex damper replacements in Los Angeles take two to three hours from start to finish, including removing the old hardware and confirming the new damper seals correctly. If we have to rebuild the mounting ring on a top-sealing unit, it can take closer to four. We’ll always give you a time estimate up front so you know what to expect. Call (336) 863-3889 to schedule, and you’ll know exactly who’s coming before we arrive.
Yes. Our trucks carry the common DuraFlex damper sizes, replacement cables, levers, and mounting rings, so we can often do the job in a single visit. If you need a size we don’t have on board, we can usually get it within two business days from our Los Angeles suppliers. We’ll let you know which parts are in stock before we even come out.
If your DuraFlex damper is giving you trouble, call us at (336) 863-3889 for a free estimate. A live person answers every call, day or night, and we’ll tell you exactly what to expect before our technician ever knocks on your door. You’ll know their name and see their photo before they arrive. We serve Los Angeles and nearby areas, and we’ve been doing this work since 2002.
Written by Ruben Castellano, Owner, Alcott Chimney Sweep at Alcott Chimney Sweep, serving Los Angeles and nearby areas.