Gelco Chimney Liner & Rebuild in San Francisco: What to Know First
We provide independent Gelco chimney liner and rebuild service throughout San Francisco, with most Gelco liner replacements and partial rebuilds completed in a single visit and priced upfront before any work begins. A typical Gelco stainless steel liner installation in a San Francisco Victorian runs between $2,800 and $4,200, while a full chimney rebuild with new Gelco flue components can reach $8,500 to $14,000 depending on access and masonry condition. Warren Eckhart and our team have worked on Gelco systems in this city for over three decades, from the steep roofs of Pacific Heights to the fog-beaten chimneys of the Outer Richmond.
This page is for homeowners who already know they have a Gelco liner or Gelco-compatible system and need straight answers about what’s failing, what it costs to fix in San Francisco, and who can do the work without manufacturer runaround. Call (855) 408-5567 anytime - a live person answers, 24 hours a day.
How Gelco Products Fail - and How We Fix Them
- Gelco Stainless Pro series: weld-seam corrosion at the flex-to-rigid transition. In San Francisco’s salt-laden fog, especially within two blocks of the Pacific in the Sunset or Richmond districts, the welded joint where Gelco’s flexible liner meets the rigid vertical section corrodes from the outside in. Homeowners smell damp ash or see rust streaks on the exterior masonry. We cut back to sound metal, fabricate a custom transition piece from thicker 316Ti alloy, and seal the exterior joint with high-temp silicone rated for marine exposure - not the standard caulk other crews use.
- Gelco UltraFlex: accordion collapse in offset flues common to 1920s San Francisco construction. The UltraFlex’s tighter corrugation gives excellent draft in straight flues, but in the offset chimney throats found in Mission District Edwardians and Noe Valley Victorians, the liner can accordion at the bend under thermal cycling. We find this during our Level-2 camera inspection - the liner looks intact from the top but has folded like a bellows two feet down. Our fix is either a custom-bent rigid Gelco section through the offset, or switching to DuraFlex’s more forgiving corrugation profile when space allows.
- Gelco Pro-Roll: seam separation in high-heat fireplace inserts. The rolled-seam construction on earlier Pro-Roll liners can open under sustained temperatures above 1,800°F, which happens when Pacific Heights or Nob Hill homeowners overfire their inserts during cold snaps. The gap is often hairline and invisible from the firebox. We detect it with camera inspection, then replace with a fully welded Gelco Stainless Pro or, if the flue is oversized, a HeatShield cerfractory resurfacing that eliminates seams entirely.
- Gelco top plate and rain cap: galvanic corrosion with dissimilar metals. Gelco’s standard top plate is 304 stainless, but many San Francisco homes have copper flashing or older galvanized caps from previous repairs. The galvanic reaction eats the Gelco plate from underneath, especially where fog moisture pools on flat-top chimneys in the Marina and Hayes Valley. We replace with marine-grade 316 stainless Gelco plates, isolate dissimilar metals with dielectric washers, and slope the cap to shed water - a detail Gelco’s installation manual mentions but many installers skip.
- Gelco liner sizing mismatch in converted coal flues. San Francisco’s pre-1906 housing stock and immediate rebuild era produced extra-wide coal flues that were later adapted for wood or gas. A standard Gelco 6″ or 8″ liner drops into a 12″x16″ flue with inches of dead air space, causing condensation, poor draft, and accelerated creosote buildup. We calculate the proper liner size using NFPA 211 sizing tables, then install an insulated Gelco liner pack or pour a HeatShield slurry liner to reduce the cross-section - whichever gives proper draft for the appliance without choking it.
Our Gelco Chimney Liner & Rebuild Process
- 1
Call and schedule. A live person answers, notes your Gelco model if you know it, and books a Level-2 inspection. We serve all San Francisco neighborhoods with same-day or next-day availability.
- 2
Camera inspection and documentation. Our technician runs a camera the full length of your Gelco flue, photographs every joint, transition, and defect, and explains what we’re seeing in plain English. You get the photos and a written verdict before any repair is discussed.
- 3
Parts decision: OEM Gelco, compatible aftermarket, or hybrid. We stock common Gelco stainless and flex liners, but for obsolete Pro-Roll sizes or unusual diameters, we source quality aftermarket equivalents or fabricate transitions in-house. We tell you exactly what’s going in your chimney and why.
- 4
The repair or rebuild. For liner replacement, we pull the old Gelco, inspect the flue walls, and install the new system with proper insulation and support. For rebuilds, we work course by course, integrating the new Gelco flue components as we go. Most jobs finish in one day.
- 5
Post-repair testing and documentation. We run another camera pass, perform a smoke test or draft test depending on the appliance, and record the results. The 90-Day Done Right Promise goes in writing before we leave.
- 6
Cleanup and final walkthrough. We protect floors and furniture, vacuum thoroughly, and walk you through what was done, what to watch for, and when to schedule your next inspection.
What Gelco Chimney Liner & Rebuild Costs in San Francisco
These are real numbers for San Francisco properties, based on jobs we’ve completed in the last eighteen months. Every estimate is free and fixed before work begins.
| Service | Typical Range | What Moves the Price |
|---|---|---|
| Gelco liner repair (patch, reseal,局部) | $850 - $1,800 | Height of chimney, accessibility, extent of corrosion |
| Gelco stainless steel liner replacement (flex or rigid) | $2,800 - $4,500 | Diameter, length, insulation required, offset complexity |
| Gelco liner + partial rebuild (crown, top courses) | $4,500 - $7,500 | Masonry condition, scaffolding needs, matching historic brick |
| Full chimney rebuild with new Gelco flue system | $8,500 - $14,000 | Height, footprint, seismic reinforcement, architectural detail |
San Francisco’s steep roofs, tight lot lines, and seismic code requirements add labor and sometimes scaffolding costs that suburban estimates don’t capture. We price for the actual job on your actual house - not a template. Call (855) 408-5567 for a free estimate; the number we give is the number on the invoice.
Why San Francisco Homeowners Call Hearthstone Chimney Co. of San Francisco for Gelco Work
We’ve been on San Francisco roofs since 1984. Warren Eckhart learned this trade climbing chimneys in the Outer Sunset where he grew up, and our technicians today are background-checked, uniformed, and trained to the same standard: if the flue isn’t right, the fire isn’t right. Everything else follows from that.
The 90-Day Done Right Promise means we come back if something’s not right - in writing, no arguing, no paperwork chase. We answer the phone with a live person every hour of every day, because chimney problems don’t wait for business hours. And while we know Gelco systems inside and out, we also carry DuraFlex and HeatShield, so if a different material solves your problem better, we’ll tell you straight.
We document every inspection with photos you can see and a plain-English verdict. No surprises on the bill. We’ll be there when we say. That’s how we’ve stayed in business in this city for over 42 years.
FAQs
Installing a new Gelco liner yourself or using an uncertified installer can void the product warranty, but our work as an independent Gelco service provider does not automatically invalidate existing coverage. We install to manufacturer specifications, use OEM or equivalent-grade parts, and document everything so warranty claims remain possible. If your Gelco system is still under warranty, we’ll review the terms with you before starting work. Call (855) 408-5567 and we’ll sort it out.
Gelco discontinued the Pro-Roll seam-welded line in favor of fully welded construction, so exact OEM replacements in certain diameters are no longer manufactured. We maintain stock of common Pro-Roll sizes, fabricate custom transitions in-house, and can substitute compatible DuraFlex or HeatShield solutions when a direct Gelco match isn’t available. We’ll show you the options and the price difference before you decide.
Repair makes sense when the damage is localized - a separated seam, a corroded top plate, or a single failed section - and the liner is less than fifteen years old. Replacement is the better value when we find multiple failure points, the liner is undersized for your current appliance, or the metal is thinning throughout. Our camera inspection shows you exactly which situation you’re in. Estimates are free; call (855) 408-5567.
Most Gelco liner replacements and partial rebuilds are completed in a single visit of four to six hours. Full chimney rebuilds typically take two to three days, depending on weather and masonry curing requirements. We stock standard Gelco diameters and can usually schedule within 48 hours. If you’re without heat or there’s an active leak, tell us when you call - we prioritize urgent situations.
Yes. We service and install DuraFlex, HeatShield, Olympia Chimney, Famco, and Copperfield systems, and we often recommend switching brands when another material better suits your flue condition or appliance type. Our technicians carry the training and inventory to work across all major professional-grade lines, so you’re not locked into one manufacturer’s limitations. Call (855) 408-5567 to discuss what’s right for your chimney.
Written by Warren Eckhart, Owner & Master Sweep, Hearthstone Chimney Co. of San Francisco at Hearthstone Chimney Co. of San Francisco, serving San Francisco and nearby areas.