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.
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Before
AfterGelco Chimney Liner & Rebuild in San Mateo: What to Know First
We provide independent Gelco chimney liner and rebuild service in San Mateo, with most Gelco liner replacements and partial rebuilds completed in one to two days after inspection. Every job starts with a camera-scan of the flue, a written price you approve before any work begins, and a documented photo record when we’re done. The camera doesn’t guess. Neither do we.
This page is for San Mateo homeowners who already know they have a Gelco liner or Gelco-compatible system and need to know whether it can be repaired, what a rebuild actually involves, and what it will cost. Corrine Halstead and our crew have worked Gelco systems across San Mateo, including the older masonry chimneys in Baywood where salt air and clay flue degradation accelerate liner failure. Call (650) 600-3117 for a free estimate, or bring us a competitor’s written quote for a free second opinion.
How Gelco Products Fail - and How We Fix Them
- Gelco UltraPro flexible liners in San Mateo coastal zones often show premature seam separation where salt-laden fog cycles through the flue daily. The 316Ti alloy resists acid well, but the rolled-seam construction at the collar joint can work loose after 8-12 years in our climate. We cut back to sound metal, source matching gauge Gelco collar sections through Haven’s buying network, and re-terminate with a proper top plate and storm collar.
- Gelco stainless rigid pipe (used in some fireplace insert retrofits around San Mateo’s 1950s ranch stock) fails at the telescoping section when installers left the slip joint unsealed. Soot packs the gap, the joint freezes, and removal requires cutting. We replace with a new Gelco or DuraFlex telescoping section, sealed and mechanically locked per manufacturer spec.
- Gelco oval-to-round adapters in chimney relines are a known pinch point. The crimped transition collects creosote in San Mateo’s cool, damp burning season, accelerating corrosion at the weld. We inspect with a camera before quoting, and if the adapter is compromised, we fabricate a smooth custom transition or source an OEM Gelco replacement, never forcing a generic fit.
- Gelco top-mount dampers integrated with liner tops seize when the stainless cable sheath fills with debris from nearby eucalyptus or Monterey pine, both common in San Mateo yards. The damper motor or chain drive fails, and the homeowner smells smoke on the first fire. We clean the assembly, replace the cable and seal if salvageable, or swap to a new Gelco top-mount unit with a debris shield.
- Gelco liners in pre-1980 chimneys with no chimney crown suffer spalling brick and mortar infiltration at the flue wall interface. The liner itself is sound, but the surrounding masonry is disintegrating. We don’t just drop a new liner in a collapsing chase. We quote the rebuild scope separately: crown pour, brick repair or rebuild, then liner reinstallation with proper clearance to combustibles per NFPA 211.
Our Gelco Chimney Liner & Rebuild Process
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Schedule and arrival. You call (650) 600-3117, a live person answers, and we book a Level 2 inspection. You get a text when your tech is en route, with name and photo.
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Camera-scan diagnosis. We run a chimney camera the full flue length, document liner condition, joint integrity, and any masonry degradation. You watch the footage with the tech. The price comes after the evidence.
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Parts decision. If Gelco OEM is available at honest pricing through our Haven network, we quote it. If lead times stretch or pricing spikes, we quote equivalent DuraFlex or HeatShield components that meet the same UL 1777 listing, with your approval.
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Written scope and price. Clause 1 of the Haven Standard: written price, written scope, written warranty, delivered before work starts. No exceptions.
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Repair and test. We complete the liner replacement or rebuild, perform a smoke test or draft measurement, and run a final camera pass to verify installation.
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Documentation and closeout. Clause 4 of the Haven Standard requires a photo record on every job. You receive photos, camera footage, and a written completion summary. The 365-Day Done Right Promise begins.
Before
AfterWhat Gelco Chimney Liner & Rebuild Costs in San Mateo
| Service | Typical Range | What Moves the Price |
|---|---|---|
| Gelco flexible liner replacement (single flue, standard height) | $2,800 - $4,200 | Flue length, access difficulty, whether the existing top plate is salvageable |
| Gelco rigid liner replacement (fireplace insert) | $3,200 - $5,000 | Number of elbows, telescoping section condition, surround panel work |
| Partial chimney rebuild with Gelco liner reinstall | $5,500 - $9,000 | Courses of brick, crown reconstruction, scaffolding needs |
| Full chimney rebuild with new Gelco liner system | $12,000 - $18,000 | Height, liner diameter, chase enclosure rebuild, permit requirements |
| Gelco liner repair (seam patch, collar replacement, adapter swap) | $650 - $1,400 | Part availability, access, whether camera shows adjacent damage |
Permits in San Mateo add $200-$400 for rebuilds; we pull them and include the cost in your written quote. Every estimate is free. Call (650) 600-3117 for an exact quote on your Gelco system.
Why San Mateo Homeowners Call Level Two Chimney San Mateo for Gelco Work
We’ve completed more than 38,000 chimney inspections and cleanings since 2009, every one with a written price before work started and a documented record when done. For Gelco owners in San Mateo, that means no guesswork on whether your 316Ti liner is thinning at the seams, no pressure to replace what a patch can fix, and no mystery about what you’re paying for.
Corrine Halstead and our crew know Gelco’s product lines from hands-on work, not a catalog. When Gelco OEM runs long on lead time, we quote DuraFlex or HeatShield equivalents from our Haven buying network, same UL listing, honest price. Background-checked, uniformed technicians. Live phone support 24/7. The 365-Day Done Right Promise stamped on every job. Free second opinion on any written estimate.
FAQs
No. As an independent Gelco service provider, we follow installation practices that preserve manufacturer warranty coverage where the product is still under warranty. We document our work with photos and written scope, which you’ll need if a warranty claim arises. Call (650) 600-3117 if you have a specific warranty concern.
Most Gelco liner replacements in San Mateo are completed in one day. A full chimney rebuild with liner reinstall typically takes two to three days, plus cure time for mortar and crown. We give you a firm schedule in your written quote, not a range.
We can often repair localized Gelco liner damage, seam separation, or collar failure if the camera shows the surrounding metal is sound. If the liner shows widespread corrosion, multiple seam failures, or thinning below manufacturer minimum, we quote replacement. The camera footage decides, not a sales pitch. Call (650) 600-3117 for a free inspection.
We source Gelco through Haven’s buying network, which also carries DuraFlex, HeatShield, Olympia Chimney, Famco, and Copperfield. If Gelco OEM is backordered, we quote an equivalent UL-listed component with your approval, never substituting without written consent.
NFPA 211 recommends annual inspection for all chimney systems, including lined ones. In San Mateo’s coastal climate, we see accelerated corrosion at liner joints and top assemblies. A Level 2 camera inspection catches this before it becomes a rebuild. Call (650) 600-3117 to schedule.
Written by Corrine Halstead, Owner, Level Two Chimney San Mateo at Level Two Chimney San Mateo, serving San Mateo and nearby areas.