Sweep & inspection
Caps & crowns
Flue relining
Masonry repair
Gas fireplace serviceLevel 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.
Gelco Chimney Cleaning in San Francisco, CA | Alcott Chimney San Francisco
We provide independent Gelco San Francisco Chimney Sweep and service across the city, from Sunset District row houses to Pacific Heights Victorians. What separates our Gelco work here is simple: we understand how this brand’s liners and caps behave inside fog-wetted, pre-war masonry stacks, not just in a catalog. If you own a home with a Gelco liner or cap and suspect it’s not drafting right, call (831) 534-3789 for a straight answer.
We’re Alcott Chimney San Francisco, and we’ve been working on chimneys across this city for years. Our techs know Gelco flexible stainless and rigid alloy systems the way a mechanic knows a specific engine: not from a manual, but from pulling hundreds of them apart and putting them back right. We’re not factory-authorized, and we’ll never claim to be. We’re independent professionals who stock OEM Gelco components because old San Francisco chimneys don’t forgive aftermarket compromises. Ruben Castellano, our owner, grew up in East Los Angeles and learned his trade at LA Trade-Tech before spending close to two decades cleaning and inspecting chimneys across California. He’s the one who set our rule: if we can’t show you the problem on camera, we don’t recommend the repair.
Why San Francisco Residents Choose Us for Gelco Service
Most chimney companies in San Francisco can sweep a flue. Few can tell you whether the Gelco liner in your 1906 Edwardian is worth saving or quietly becoming a hazard. That’s the difference. We work on Gelco sales & service systems installed in the exact housing stock that defines this city: original brick chimneys, multiple flues, shared stacks, steep roof access, and liners that have outlived their warranties by a decade or more.
Ruben and his crew have served San Francisco homeowners long enough to recognize the failure patterns before they become emergencies. A Gelco flex liner kinked during a narrow Victorian flue install. A cap that never quite fit the chase, so fog moisture runs down between tiles all winter. A stainless liner corroding at exactly the top joint because the original mortar crown has been shedding water into the gap for thirty years. When you call us, you get someone who’s seen these problems in this city, on these houses. Tell me what you’re seeing, and Ruben will tell you straight what it means.
Every tech we send is background-checked and identity-verified. You’ll know the technician’s name and see their photo before we arrive. That’s not an add-on. It’s how we’ve always worked.
Styles & brands we work with
Common Gelco Chimney Cleaning Problems We Solve in San Francisco
- Kinked flex liners in narrow Victorian flues. Original San Francisco brick chimneys often have flues that were never designed for a liner at all. When a Gelco flexible liner gets forced through a tight offset or a 90-degree turn, it kinks. That kink catches creosote, and within a season or two you’ve got a draft problem and a fire risk. We see this constantly in pre-1940 single-family homes. The fix usually means pulling the liner and measuring the actual flue geometry before recommending what goes back in.
- Fog-driven moisture behind Gelco multi-flue caps on shared row-house stacks. In the Richmond and Sunset, attached homes often share a chimney stack with separate flues for each unit. If a Gelco cap was installed without a full chase cover, coastal fog and winter rain run straight down between the flue tiles. One blocked flue can push smoke through a cracked liner into the neighbor’s living room. We inspect these as a pair, because that’s the only way it works.
- Corroded stainless liner tops at the mortar crown joint. This is the San Francisco classic. The original mortar crown cracks, water runs down into the annular space between the liner and the brick, and the stainless starts scaling right at the top joint. By the time you notice staining on the ceiling below, the liner is usually compromised. We catch this on Level 2 camera inspections before it gets that far.
- Gelco rigid alloy sections separating at slip joints. Seldom-used fireplaces in San Francisco still go through thermal cycling, just slowly. Over years, rigid alloy sections flex and settle, and slip joints open up. That lets exhaust seep into wall cavities instead of going up the flue. We find this most often in homes where the fireplace is used a handful of times a year, usually during cold snaps.
- Creosote bridging across corrugations. Gelco flex liners have a corrugated interior profile. When a liner is oversized or the draft is weak, creosote builds in the valleys first, then bridges across. It doesn’t take long. By the time smoke backs up, you’ve got glaze-stage creosote that a standard brush won’t remove. We remove it with rotary tools and chemical treatment, then address the underlying draft problem.
Gelco Service in San Francisco: What Local Conditions Mean for Your Equipment
Here’s the piece that matters. In San Francisco’s Richmond and Sunset Districts, many attached wood-frame homes share a single chimney stack with separate flues for each unit. Gelco liners and caps on these stacks must be swept and inspected as a pair, because one blocked flue can push smoke through a cracked liner into the neighbor’s living room. That’s a call pattern you won’t see in Oakland or Daly City, where detached homes mean a chimney problem stays your chimney problem. It’s also why we never quote a sweep or a repair on a shared stack without looking at both flues. Sometimes the neighbor hasn’t used their fireplace in years, and the creosote in their flue is sitting there like a fuse waiting for your fire to light it through a cracked clay tile. We document it on camera, we show you both sides, and we recommend only what’s needed. That’s the standard on every shared-stack job we take in this city.
One job sticks in our minds. Our crew pulled our Chimney Inspection in San Francisco on an Edwardian two-story on 8th Avenue in the Inner Richmond after a Gelco flexible liner had been installed without a chase cover. Fog moisture had rotted the top joint of the stainless liner, and flaking creosote had dammed the corrugations just above the damper. We removed the liner, swept the original clay tile, and installed a new Gelco rigid alloy section with a full stainless chase cover and a correctly sized multi-flue cap. Draft restored, and smoke stopped backing into the second-floor bedroom. That’s not a marketing story. It’s what these houses do.
Gelco Models & Products We Service in San Francisco
We work on four Gelco product lines across our San Francisco service area: the Flexible Stainless Steel Chimney Liner, the Rigid Alloy Chimney Liner, the Chase Cover, and the Multi-Flue Cap. Each has a specific failure profile in this city’s housing stock, and each has a specific inspection protocol on our end.
When parts are needed, we default to OEM Gelco liner sections and cap components. Mixing aftermarket stainless gauges inside old brick flues invites galvanic corrosion and fit problems that a Chinese-made substitute won’t outlast. We stock common Gelco components locally so most San Francisco repairs don’t wait on shipping. When a liner is crushed, perforated, or older than 15 years with visible scaling, we recommend replacement rather than patching. Repairing a compromised liner in a shared San Francisco stack rarely outlives the next wet winter.
See the difference
Before
After
Before
After
Before
AfterGelco Service Pricing in San Francisco
A standard Gelco chimney cleaning in San Francisco typically runs $229 to $319 before any repairs, depending on roof access, flue count, and whether you’re on a shared stack. Multi-flue caps add labor. A full Gelco liner replacement on a Victorian flue can run $1,800 to $4,200 depending on height and whether scaffolding is required.
Every estimate is written, and it’s delivered before any work starts. No exceptions. If we find something during the sweep, you’ll see it on camera and approve the cost before we touch it. Call (831) 534-3789 for an exact quote. Estimates are free.
Serving San Francisco, CA - Our Local Coverage Area
We’re based in the San Francisco area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs – Gelco Chimney Cleaning in San Francisco
Yes, in most cases. We reline existing brick flues from the top down, which means no interior demolition. The limiting factor is the flue’s interior geometry. If a previous liner or decades of creosote have narrowed the passage, we may need to remove the old material first. Camera inspection tells us exactly what we’re working with before we quote. Call (831) 534-3789 if you’re considering it.
Because fog doesn’t fall like rain. It condenses on every cold surface and drips down chimney interiors even when rain never touches the cap directly. A Gelco multi-flue cap without a properly sized chase cover leaves gaps where condensation runs down between flue tiles and into the firebox. We fix this by sealing the chase and verifying the cap is sized to the actual outer dimensions of your stack, not just the flue openings.
We use camera inspection on every Gelco liner scan in San Francisco, full stop. Many pre-1940 chimneys here have no interior cleanout access, so rooftop access is the only entry point. But a visual look down the flue is not an inspection. We run a camera the full length of the liner and log the footage. You get the report. If we can’t see it on camera, we don’t claim it’s fine.
Three to five business days in most Richmond District cases. We carry common Gelco chase cover sizes locally, but a shared stack with unusual dimensions may require fabrication. That adds time. We quote the lead time up front, in writing. Call (831) 534-3789 for a current estimate on your stack.
Generally yes, because rigid alloy liners hold their shape under sustained heat better than flexible corrugated stainless. If the firebox shows signs of over-firing (cracked firebrick, warped damper, discolored masonry), a rigid liner is usually the safer call. But we won’t recommend it blindly. We measure the flue, inspect the firebox, and tell you what the house actually needs. Call (831) 534-3789 for a straight answer.
Service Areas Near San Francisco
Our San Francisco techs also handle Gelco service in Gelco service in Oakland, Gelco service in San Mateo, plus Berkeley, Daly City, and Richmond. If you’re on the edge of the city or across the Bay, chances are we already cover your neighborhood.
Book Your Gelco Service in San Francisco Today
You’ll know who’s coming before the truck parks. You’ll get the written price before the sweep starts. And if anything we repair fails within 365 days, the second visit is free. Call (831) 534-3789 to book your Gelco service in San Francisco.
Written by Ruben Castellano, Owner at Alcott Chimney San Francisco, serving San Francisco since 2002.