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.
Gelco Chimney Cap & Crown in Ashburn: What to Know First
We install, replace, and repair Gelco chimney caps and crowns across Ashburn, and most jobs are finished in a single visit once we’ve sourced the right part. A standard Gelco cap replacement in Ashburn typically runs $340 to $720 including the cap, mounting, and our documented photo record; a crown repair or recoat usually lands between $450 and $950 depending on crown size and condition. This page is for the homeowner who already knows they have a Gelco product on the roof and wants straight answers about what fails, what it costs, and what we actually do differently. If you’d rather talk it through, call (240) 220-9412 and ask for Corrine.
How Gelco Products Fail - and How We Fix Them
Gelco builds a solid cap. But Ashburn weather has a way of finding the weak points in any steel product, and we’ve seen enough Gelco failures to know exactly where to look first. Here’s what actually shows up on our camera runs:
- Gelco single-flue caps with expanded mesh screens: rust-through at the screen seam. The cap body holds up, but the mesh is a thinner gauge than the hood. Condensation from a gas appliance settles on that seam, and within four to six years in Ashburn’s humid summers, the screen starts to flake. We replace the cap or retrofit a stainless mesh that matches the existing Gelco hood profile.
- Gelco multi-flue caps on newer construction in the One Loudoun area: misaligned mounting brackets. Builders move fast, and we regularly find Gelco caps where the legs were shimmed to fit a crown that wasn’t level. The cap sits tight for two seasons, then wind rattles it loose. We remove, check the crown plane with a level, and remount with a sealed base before tightening.
- Gelco draft-increasing caps (the vane-style tops): seized bearings in the rotary assembly. In northern Virginia you get enough freeze-thaw cycles that a vane style cap can lock up by February. Birds then build under the hood because it doesn’t spin anymore. We clean the assembly, and if the bearing is shot, we quote a replacement cap rather than pretend a lubrication will hold.
- Galvanized Gelco caps on wood-burning flues: premature rust from creosote contact. A Galvanized cap on a wood appliance sees acidic creosote vapor that eats the zinc layer. This isn’t a Gelco defect; it’s a material mismatch. We recommend upgrading to Gelco’s stainless line or an equivalent, and we’ll show you the corrosion on the camera before we quote it.
- Gelco caps with a solid top and side draft openings: blockage from leaves and maple samaras. Ashburn has no shortage of maple trees, and those winged seeds find side-draft openings like they were designed to. We’ve pulled enough of them out to know the easiest fix is a cap with a finer outer screen, not a taller hood.
One thing we want to be clear about: we are an independent Gelco service provider. We installed our first Gelco cap years before we formalized our Ashburn route, but we’re not authorized by or affiliated with Gelco in any way. What that means for you is we can be honest about when a quality aftermarket part does the same job for less money.
Our Gelco Chimney Cap & Crown Process

Here’s what a Gelco cap or crown job looks like when you call us in Ashburn:
- 1
You call, a live person answers. We schedule a window, and you get a text when the tech is on the way with a name attached to the truck.
- 2
We camera-scan the flue and the cap from the roof. NFPA 211 Level 2 standard, every time. The camera doesn’t guess. Neither do we. You’ll see photos of your current cap or crown before we discuss anything.
- 3
We write the scope and price. You get a written price, written scope, and written warranty before anyone touches a tool. Haven Standard Clause 1. Not a verbal estimate.
- 4
We source the right part. If it’s a Gelco cap, we’ll quote Gelco OEM or a quality aftermarket equivalent and explain the difference in plain terms. For crowns, we mix and pour on site with a proper crown sealer, not a painted-on patch.
- 5
We do the work and test it. We check draft, confirm the cap is level, and photograph everything.
- 6
You get the documented record. A photo report of the work, the written warranty, and the 365-Day Done Right Promise stamped on the job. If it’s not done right, we make it right.
Before
AfterWhat Gelco Chimney Cap & Crown Costs in Ashburn
| Job | Typical Range in Ashburn | What Moves the Price |
|---|---|---|
| Gelco single-flue cap replacement | $340 - $520 | Flue size, stainless vs galvanized, roof access difficulty |
| Gelco multi-flue cap (custom or stock) | $480 - $720 | Crown dimensions, number of flues, custom fabrication |
| Crown repair (minor spalling fill) | $450 - $650 | Crown size, extent of spalling |
| Crown rebuild and recoat | $780 - $950 | Full crown removal, re-pour, waterproofing membrane |
| Gelco cap inspection + camera scan | $89 - $129 | Combined with cleaning, the inspection is included |
The honest posture is this: we name the price before we order a single part. A free second opinion on any written estimate means if another Ashburn chimney company quoted you something, bring it. We’ll look at it and tell you plainly whether it’s fair. Estimates are always free. Call (240) 220-9412.
Why Ashburn Homeowners Call Level Two Chimney Ashburn for Gelco Work

We don’t expect you to be impressed by “since 2009” or the 38,000 inspections we’ve run. Numbers can be claimed. What we can show you is the photo record from your own flue, before and after. Every job, including a Gelco cap replacement, comes with a documented photo record under Haven Standard Clause 4, the same archive practice we started in 2009. Our techs are background-checked and uniformed, and when a Gelco part is backordered or wrong for the job, we’ll say so and quote DuraFlex or HeatShield options instead of waiting silently. Corrine Halstead runs the truck, the camera, and the quotes around here, and she’s known in Ashburn for leaving with written findings in your hand and a price named before anyone has to ask.
FAQs
For most Gelco cap failures in Ashburn, replacement is cheaper than repair by the time you factor in the rust or bearing wear we actually see. If the hood is solid but the screen is rotted, we can replace just the screen on some models, but we won’t recommend it if the base is also showing corrosion. Call (240) 220-9412 and we’ll quote both options in writing.
Gelco warranties typically cover the cap itself, not the chimney system, and an aftermarket cap won’t affect your chimney liner or appliance warranty. We tell you up front when a Gelco OEM part matters and when a quality aftermarket equivalent saves you $150 with no functional difference.
Most residential Gelco cap replacements take one to two hours on site, including the camera scan, mounting, and photo report. Custom multi-flue caps need a fabrication window of three to seven days.
We schedule crown work within a week in most cases; a crumbling crown is urgent but not a same-day emergency. If water is actively leaking into the firebox during a storm, we’ll prioritize you. Call (240) 220-9412 and tell us what you’re seeing.
Yes. Every cap job includes a crown inspection and camera-scan of the flue as standard. If we find crown spalling or cracks, you’ll see the photos and get a separate written quote for the repair rather than a surprise on the invoice.
Written by Corrine Halstead, Owner, Level Two Chimney Ashburn at Level Two Chimney Ashburn, serving Ashburn and nearby areas.





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