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
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AfterGelco Chimney Liner & Rebuild in Boston: What to Know First
We provide independent Gelco chimney liner and rebuild service across Boston, with most jobs completed in a single visit and pricing agreed upfront before any work begins. A typical Gelco stainless steel liner replacement runs $2,800-$4,500 depending on flue height and access, while partial rebuilds start around $3,200. We are not affiliated with or authorized by Gelco - we are an independent service provider who has worked on enough of their products to know where they hold up and where they don’t.
This page is for Boston homeowners who already have a Gelco liner or are considering one, and need straight talk about what fails, what it costs to fix, and who can actually do the work right. If you’re in Dorchester, Roslindale, Jamaica Plain, or anywhere in between, call (857) 597-5950 and a live person will pick up, 24 hours a day.
How Gelco Products Fail - and How We Fix Them
- Gelco Ultrapro stainless liners crack at the flex-to-rigid transition. The Ultrapro’s corrugated flex section meets a smooth rigid pipe at a welded collar that sees the most thermal stress in the entire system. In Boston’s freeze-thaw cycle, that collar works loose over five to seven years. We cut back to sound metal, install a proper Gelco-compatible transition piece or a DuraFlex equivalent if the OEM part is back-ordered, and back-seal with high-temp silicone rated to 1,200°F.
- Gelco ProFlex flexible liners sag in tall, offset flues common in triple-deckers. The ProFlex is lighter gauge than it looks on the spec sheet, and in a three-story Dorchester triple-decker with a 45-degree offset, the liner can belly out at the bend. We pull a camera first to map the sag, then either install a rigid support plate at the offset or upsize to a heavier DuraFlex liner if the flue geometry allows. The ProFlex itself isn’t defective - it’s just the wrong choice for certain Boston housing stock.
- Gelco top-mount dampers seize after salt-air exposure. Coastal neighborhoods like South Boston and East Boston see accelerated corrosion on the galvanized damper frames Gelco shipped before 2018. The damper won’t open fully, which starves the fire for air and accelerates creosote buildup. We replace with a stainless damper assembly, or if the frame is too far gone, we rebuild the top of the flue with a new concrete crown and a separate Lyemance or Lock-Top damper.
- Gelco smooth-wall liners delaminate at the boot connection in oil-to-gas conversions. When a Boston homeowner switches from oil to gas, the lower flue temperature changes the condensation pattern. Gelco’s older smooth-wall boots weren’t designed for the acidic condensate that gas produces. We pull the boot, inspect the surrounding masonry for spalling, and install a gas-rated Condar or HeatShield boot with proper drainage weep holes - something Gelco’s own installation manual only added in the 2019 revision.
- Gelco chimney caps clog with creosote in dense-pack neighborhoods. The standard Gelco cap has a 3/4-inch mesh that works fine in open country but packs solid in Boston’s tight chimney rows where downdrafts are common. We see this in Back Bay brownstones where four flues share a narrow parapet. We upgrade to a Famco or Copperfield cap with 5/8-inch mesh and a wider lid overhang, or fabricate a custom copper cap if the building is landmarked.
Our Gelco Chimney Liner & Rebuild Process
- 1
Call and schedule. A live person answers, asks what you’re burning, how old the system is, and whether you’ve noticed smoke, odor, or draft problems. We book a Level-2 camera inspection, not a sales visit.
- 2
Camera inspection and photos. Our technician runs a chimney camera from top to bottom, records the full flue, and stops to photograph every defect. You see the images on a tablet before we leave the roof. We deliver a plain-English verdict: what’s wrong, what caused it, and what happens if you do nothing.
- 3
Parts decision: OEM Gelco or quality equivalent. If the job is warranty-related and Gelco parts are in stock, we use them. If the warranty has expired or Gelco is back-ordered (their Massachusetts distributor sometimes runs two weeks out on ProFlex transitions), we specify DuraFlex or HeatShield equivalents that meet or exceed UL 1777. We explain the trade-off and you decide.
- 4
The repair. Our crew arrives in a single truck with the liner, mortar, and rebuild materials already loaded. Most Gelco liner replacements and partial rebuilds finish in one day. We protect floors, contain dust, and haul away the old liner.
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Post-repair test and documentation. We run a smoke test or draft gauge check, depending on the appliance type. You get a written report with photos, the 90-Day Done Right Promise in writing, and an invoice that matches the estimate exactly.
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Cleanup and follow-up. We sweep the work area, walk you through what was done, and leave a card with our direct line. If anything doesn’t feel right in the next 90 days, we come back. No paperwork, no arguing.
What Gelco Chimney Liner & Rebuild Costs in Boston
| Service | Typical Range | What Moves the Price |
|---|---|---|
| Gelco stainless steel liner replacement (straight flue, 1-2 stories) | $2,800-$3,800 | Flue diameter, number of appliances connected, access difficulty |
| Gelco liner replacement with offset or 3+ stories | $3,500-$4,800 | Extra flex length, support plate installation, scaffolding in tight Boston lots |
| Partial chimney rebuild (above roofline, Gelco liner reinstalled) | $3,200-$5,500 | Brick matching, crown replacement, whether the liner can be saved |
| Full chimney rebuild with new Gelco or DuraFlex liner | $7,500-$12,000 | Height, scaffolding, historic district requirements, liner diameter |
| Gelco liner repair (boot replacement, transition fix, cap upgrade) | $650-$1,800 | Parts availability, whether masonry repair is needed at the connection |
These are real Boston numbers, not national averages. A triple-decker in Mattapan with a straight 25-foot flue sits at the low end. A four-story Back Bay brownstone with a offset flue and a landmark review requirement sits at the high end. We give you the exact number before we start. Call (857) 597-5950 for a free estimate - we bring the camera, not a sales pitch.
Why Boston Homeowners Call Hearthstone Chimney Co. for Gelco Work
We’ve been in Boston chimneys since 1984. Russell Haines learned the trade at Los Angeles Trade-Technical College, where the instructors had no patience for shortcuts, and he’s carried that standard through more than two decades of hands-on work here - from triple-deckers in Dorchester to old brownstones near the Back Bay. Our crew knows the difference between a ProFlex that can be saved and one that needs replacing, and we won’t sell you a full rebuild when a boot replacement will do.
Every job comes with the 90-Day Done Right Promise in writing: Krafted right, Every time, Your home first, Standing behind it. If it’s not right, we make it right. No arguing. We also carry DuraFlex, HeatShield, Olympia Chimney, Famco, and Copperfield materials, so if Gelco parts are delayed or discontinued, your job doesn’t stall. Photos you can see, a plain-English verdict, and a square deal with no surprises on the bill.
If the chimney’s doing its job, you won’t notice it. You hire us so it stays that way.
FAQs
No, provided the repair is done with Gelco OEM parts or equivalent components that meet the original UL listing. As an independent Gelco service provider, we document every part number and installation detail so your warranty record stays clean. If your liner is still under Gelco’s 20-year limited warranty, we flag that during inspection and use OEM parts when they’re available. Call (857) 597-5950 and we’ll check your warranty status before we book.
Most Gelco liner replacements in Boston are completed in a single day, with the crew arriving between 8 and 9 a.m. and finishing by late afternoon. A straight flue in a two-story house is typically a four-to-six-hour job. Add a day if we discover hidden masonry damage during the pull, which we almost always catch during the camera inspection. We don’t rush, and we don’t bill extra for the extra hour if the mortar needs more cure time.
We repair Gelco liners when the damage is localized - a cracked boot, a failed transition, a corroded cap - and we replace when the liner has multiple failure points, heavy creosote glazing, or corrosion that has compromised more than 30 percent of the surface. The camera inspection tells the story. We’ve saved Boston homeowners thousands by repairing a $900 boot instead of replacing a $3,500 liner, and we’ve also refused to patch a liner that would fail again in two years. You get the honest verdict, documented with photos.
Gelco is still manufacturing, but their distribution in New England has narrowed and certain ProFlex and older smooth-wall components are on longer lead times. We maintain relationships with the remaining distributors and stock common failure parts. When Gelco parts are back-ordered, we offer DuraFlex or HeatShield equivalents that meet the same UL 1777 standard and often exceed Gelco’s original specifications. We explain the source and you choose.
The National Fire Protection Association recommends annual inspection for all chimney systems, and in Boston’s freeze-thaw climate we agree. Salt air, thermal cycling, and the shift from oil to gas heating all stress liners faster than the Midwest or South. A Gelco liner that looks fine at year five can show hairline cracks by year seven. Our $89 Seasonal Tune-Up includes a Level-1 inspection; if we see anything suspicious, we recommend the Level-2 camera inspection before the next burning season. Call (857) 597-5950 to schedule - estimates are free.
Written by Russell Haines, Owner, Hearthstone Chimney Co. at Hearthstone Chimney Co., serving Boston and nearby areas.