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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AfterGelco Chimney Cap & Crown in Leesburg: What to Know First
We provide independent Gelco chimney cap and crown service in Leesburg, with most Gelco cap replacements and crown repairs completed in a single visit and priced upfront before any work begins. A standard Gelco cap installation runs $340-$620 depending on flue count and whether the crown needs attention at the same time. We are not affiliated with or authorized by Gelco - we are an independent service provider who has worked on enough Gelco products across Loudoun County to know where they hold up and where they do not. If you are burning regularly in a Leesburg home built between 1985 and 2010, there is a fair chance your cap or crown is Gelco. Call us at (571) 701-7519 for a free estimate and camera inspection.
How Gelco Products Fail - and How We Fix Them
- Gelco Multi-Flue Caps - screen collapse from creosote weight. The Multi-Flue series uses a heavier-gauge mesh than economy brands, but in Leesburg’s cold-start burning pattern (fireplaces that sit cold all week then run hard Saturday night), creosote cakes thick and fast. The screen eventually sags or separates at the weld. We replace with OEM-spec Gelco mesh where the frame is sound, or move to a quality aftermarket cap with a steeper roof pitch and wider overhang if the frame has warped from heat cycling.
- Gelco Single-Flue Caps - base seal deterioration on oil-flue conversions. Older Leesburg colonials near Morven Park that converted from oil to gas in the 1990s often kept their original Gelco single-flue caps. The base seal ring was not rated for the cooler, wetter exhaust of a modern gas appliance. It cracks, lifts, and lets water track down the flue tile. We remove the cap, reseat with a silicone-composite base seal rated for gas condensate, and verify draw with a smoke test.
- Gelco Crown Seal coating - alligatoring after five to seven years. Gelco’s brush-on crown seal is a decent product when applied to a sound crown, but we see it applied over hairline cracks that were never routed open first. Freeze-thaw in Leesburg’s shoulder seasons lifts the coating in plates. We strip the failed seal, grind cracks to a V, patch with CrownCoat or similar masonry repair, then reseal - or recommend a full crown pour if the structural concrete is spalling.
- Gelco wind-band caps - band rust-through at the joint. The wind-band series was popular in Leesburg’s 1990s construction boom for its clean look on brick chimneys. The stainless band that cinches the cap to the flue tile is 430-grade, not 304. After fifteen winters of road salt aerosol and freeze-thaw, it rusts through at the seam. We replace with 304-grade banding or upgrade to a Gelco outside-mount model that eliminates the band entirely.
- Gelco chase covers on prefab chimneys - corner seam separation. Gelco chase covers on factory-built chimneys in developments like Raspberry Falls and Lansdowne often fail at the cross-break corners. The factory caulk bead shrinks, water enters, and the OSB chase beneath rots. We pull the cover, assess the chase framing, replace with a Gelco cover if the dimensions are standard, or fabricate a custom break-formed cover with hemmed edges and pop-riveted corners that will not reopen.
Our Gelco Chimney Cap & Crown Process
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Call and schedule. A live person answers, 24 hours a day. We book a window that works for you - no app, no callback queue.
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Level-2 camera inspection. Our technician arrives in uniform, background-checked, and photographs the cap, crown, and flue interior. You see the photos on a tablet before any recommendation is made.
- 3
Parts decision - OEM Gelco or quality aftermarket. If the Gelco part is available and competitively priced, we quote it. If lead time is long or the design has a known weakness, we explain the aftermarket alternative (often from Famco or Copperfield) and let you decide. No pressure either way.
- 4
Repair or replacement with upfront pricing. The number on the estimate is the number on the invoice. We complete most Gelco cap and crown jobs in a single visit.
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Smoke test and documentation. We verify proper draw, document the finished work with photos, and leave you a written report.
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The 90-Day Done Right Promise. If it is not right, we come back. In writing, no arguing.
What Gelco Chimney Cap & Crown Costs in Leesburg
| Service | Typical Range |
|---|---|
| Gelco single-flue cap replacement | $340-$480 |
| Gelco multi-flue cap replacement | $480-$620 |
| Crown repair with Gelco Crown Seal | $420-$680 |
| Full crown rebuild (concrete pour) | $1,200-$1,800 |
| Chase cover replacement (prefab) | $560-$890 |
What moves the price: flue count and dimensions, whether the crown needs structural repair versus surface sealing, accessibility of the chimney (steep roof, height), and whether we are matching existing Gelco hardware or switching to a different brand. We do not recommend work without camera evidence you can see for yourself, and we will tell you plainly when something can safely wait. Call (571) 701-7519 for an exact quote - estimates are free.
Why Leesburg Homeowners Call Hearthstone Chimney Co. for Gelco Work
We have been serving Leesburg and Loudoun County for over 42 years. Russell Haines, our owner, learned the trade at Los Angeles Trade-Technical College and has spent the better part of two decades on Leesburg roofs, including the older colonials near Morven Park where chimneys work hard every winter. He is known for straightforward inspections - what he found, what it means, and what it will take to fix it, without padding the estimate.
Our technicians are background-checked, uniformed, and carry professional-grade materials from Gelco, DuraFlex, HeatShield, Olympia Chimney, Famco, and Copperfield. If Gelco lead times are long, we have alternatives that meet or exceed OEM spec. The 90-Day Done Right Promise covers every job in writing. A live person answers the phone 24 hours a day, 7 days a week. That is the Keystone Standard - Krafted right, Every time, Your home first, Standing behind it.
FAQs
No, using an independent service provider does not void any remaining Gelco product warranty, though warranty coverage on original materials is typically limited to manufacturing defects and does not cover normal weathering or improper installation. We document our work with photos so any future warranty claim on the cap itself remains clean. If your cap is less than five years old and shows premature failure, we will flag that for you and note it in our report. Call (571) 701-7519 if you want us to assess whether your issue might qualify.
A properly installed Gelco stainless cap lasts 15-20 years in Leesburg, but the 430-grade banding on older wind-band models often fails sooner due to freeze-thaw and road salt exposure. The mesh screens typically need cleaning or replacement every 7-10 years depending on burning habits. Tell me what you are burning and how often, and I can tell you what your chimney looks like before I even climb up. We inspect and advise on remaining life rather than selling replacements that are not needed yet.
Most common Gelco single-flue and multi-flue caps are available within 3-5 business days through our suppliers. Specialty sizes or discontinued series may take longer. Because we also stock and source from Famco and Copperfield, we can often offer a quality alternative with no delay if your Gelco part is back-ordered. We explain both options with pricing before you decide.
Repair with crown coating is appropriate when the concrete is sound and cracks are superficial - typically under $700. Replace the crown when you see spalling deeper than a quarter-inch, exposed rebar, or a crown that has separated from the flue tile. We never recommend a full rebuild without showing you the camera evidence. Many Leesburg homeowners are relieved to learn their crown can be repaired rather than replaced.
Gelco caps stamped after 1998 carry a small logo on the skirt or band; older caps may only be identifiable by the weld pattern and mesh gauge. Our technicians recognize Gelco hardware on sight - we have removed enough of them across Leesburg to know the telltale stamp locations and the common knockoff imitations that use thinner gauge steel. We will confirm what you have during inspection and quote accordingly.
Ready to get your Gelco chimney cap or crown sorted? Call (571) 701-7519 today. A live person will answer, schedule your free estimate and camera inspection, and give you an upfront price before any work begins. We have been serving Leesburg homeowners for over 42 years, and we plan to be here when you need us next.
Written by Russell Haines, Owner, Hearthstone Chimney Co. at Hearthstone Chimney Co., serving Leesburg and nearby areas.