Sweep & inspection
Caps & crowns
Flue relining
Masonry repair
Gas fireplace serviceLevel 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 Installation: The Jacksonville Owner’s Guide
Alcott Chimney Jacksonville stocks and installs Gelco chimney caps throughout Jacksonville, with most installations running between $285 and $520 depending on cap size, flue type, and roof access. We keep the most common Gelco cap dimensions on our trucks, so in many cases we can complete the swap the same day we diagnose the problem. Most Jacksonville homeowners call us after spotting visible rust, hearing something rattle during a windstorm, or finding water staining on the ceiling near the chimney chase. The cap is one of the few chimney components fully exposed to Florida’s salt air, afternoon thunderstorms, and hurricane-season winds, so when it fails, it rarely fails quietly.
Key Takeaways:
- Gelco caps installed in Jacksonville typically cost $285 – $520, parts and labor included.
- We stock common Gelco sizes on the truck, and most replacements are done in a single visit.
- Rust-through at the mesh seam is the most common failure point in Jacksonville’s coastal air.
- Every Gelco cap install we do comes with Alcott’s written 365-Day Done Right Promise.
Which Gelco Models This Applies To
Gelco builds chimney caps in a few distinct lines, and matching the right one comes down to two measurements: the outside dimensions of your flue tile (or the inside dimensions of your round liner) and the cap’s screen height. The most common Gelco caps we install in Jacksonville are their standard galvanized steel and stainless steel series, which cover single-flue and multi-flue masonry chimneys, plus a round-top version for metal chimney systems that terminate through the roof. You’ll find a small Gelco ID tag riveted to the cap’s underside if the wind hasn’t taken it, but after five or six Florida summers that tag is often unreadable. When the tag’s gone, our technicians measure the flue opening directly and cross-reference Gelco’s sizing chart before ordering anything.
A quick word on OEM versus aftermarket: Gelco makes a solid cap, but their stainless line handles Jacksonville’s salt air noticeably better than the galvanized version. If you replace a rusted galvanized Gelco cap with another galvanized unit, expect the same lifespan. We’ll show you the price difference between OEM Gelco and a compatible stainless equivalent from Olympia or Famco and let you decide. Independent note: Alcott Chimney Jacksonville is not affiliated with Gelco. We’re a service provider that installs their products and other professional trade brands including DuraFlex and HeatShield.
Styles & brands we work with
Signs Your Gelco Chimney Cap Installation Is Failing
- Rust staining on the cap’s exterior or on the chimney crown below it. In Jacksonville, this usually means the galvanized coating has given up to salt air and humidity. The cap isn’t done yet, but it’s on the clock.
- Water in the firebox or a damp smell after heavy rain. A failed cap lets rain fall straight down the flue. If the damper is rusted open or missing, that water ends up in your fireplace.
- Loose or rattling cap in high winds. Hurricane-season gusts loosen the mechanical fasteners or the pressure-fit ring that holds the cap to the flue. A loose cap can eventually lift off entirely.
- Animals or debris inside the flue. Jacksonville squirrels and nesting birds exploit any tear in the cap mesh. If you hear scratching in the chimney, the mesh has likely failed at a seam.
- Visible holes in the mesh or missing spark arrestor sections. This is the failure we see most often after a few years. Pinpoint rust becomes a tear, and a torn mesh no longer stops embers or wildlife.
Replacement Cost & What’s Included
A Gelco chimney cap install in Jacksonville runs $285 to $520, with the cap itself accounting for $110 to $280 and the balance being labor, roof access, and disposal of the old unit. The range widens if your chimney needs a custom-sized cap because your flue is an off-standard dimension, or if the old cap’s fasteners have corroded and need extraction. If the crown is damaged around the flue, we’ll quote that separately before any work starts, because putting a new cap on a crumbling crown is the fastest way to buy another cap next year.
Here’s the pricing picture for the most common Gelco installations in Jacksonville:
- Gelco galvanized single-flue cap, standard size: $110 – $170 for the cap, $150 – $180 labor.
- Gelco stainless single-flue cap, standard size: $190 – $260 for the cap, $150 – $180 labor.
- Multi-flue or custom-width cap: $240 – $320 for the cap, $180 – $240 labor depending on roof pitch and access.
- Cap re-securing with new fasteners (if the cap itself is still good): $115 – $145.
Every Gelco cap installation includes a written price before we start, fasteners and hardware, removal of the old cap, and Alcott’s written guarantee. If the cap or our workmanship fails within one year, we come back and make it right at no charge. That’s the 365-Day Done Right Promise, and it’s standard, not an add-on.
See the difference
Before
After
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After
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AfterDIY or Call Us?
Installing a Gelco chimney cap means getting on the roof. In Jacksonville, that job comes with heat, humidity, and steep roof pitches on a lot of older Riverside and Springfield homes. If your roof is walkable and you’re comfortable using a ladder safely, you can inspect your existing cap yourself from a position where you can see the mesh and fasteners. But we’d stop you there. This is not a component where you improvise. The wrong cap size or a loose install means you’ve bought an expensive roof ornament that doesn’t stop water or sparks. Rubber washered fasteners from the home center fail within a season here, which means you’ll be back on the roof sooner than you need to be.
The honest split: identify the problem from the ground, and let a professional do the roof work. If you’re not certain whether the cap is actually the issue, call (904) 453-7823 and we’ll talk it through on the phone before anyone rolls a truck.
FAQs
A stainless Gelco cap in Jacksonville’s coastal climate typically lasts 10 to 15 years, while the galvanized version usually gives you 5 to 8 years before rust-through becomes visible. The salt air and high humidity are the main reasons caps here wear out faster than they do inland. If you want the longer lifespan, the stainless option is the smarter purchase, and the price difference (usually $80 to $90 more) is cheaper than a second replacement. Call (904) 453-7823 for an exact quote based on your flue dimensions.
It depends on what failed. If the cap is simply loose, we can re-secure it with new stainless fasteners for $115 to $145. If the mesh has rusted through or the cap body has split at a seam, patching is a stopgap, not a fix, because the patch fails faster than the original material in Jacksonville weather. We’ll tell you plainly whether a repair will hold or whether you’re money ahead to replace.
The typical Gelco cap swap takes 45 to 90 minutes once our technician is on the roof, assuming the old fasteners come out cleanly. If we need to drill out corroded hardware or the flue needs a custom-sized cap, it can take longer. Most installations are completed in a single visit, and since we stock common Gelco sizes on the truck, we can often handle it the same day we diagnose it.
We stock the most common Gelco single-flue galvanized and stainless cap sizes on our trucks and in our local inventory. If your flue is a standard dimension, we can usually complete the install the same day. For multi-flue, round-liner, or custom-width applications, we order the cap and schedule the install once it arrives, which in Jacksonville typically takes three to five business days.
Call Alcott Chimney Jacksonville for Gelco Cap Installation
If your Gelco cap is rusted, loose, or letting water into the firebox, call us at (904) 453-7823 for a free estimate. A live person answers our phones around the clock, and you’ll get a written price before any work begins. Tell me what you’re seeing and I’ll tell you what it actually means. We serve homeowners throughout Jacksonville, from Riverside to San Marco to properties near the beaches, and every technician sent to your home is background-checked, identity-verified, and announced to you by name and photo before they ever knock.
Written by Ruben Castellano, Owner, Alcott Chimney Jacksonville at Alcott Chimney Jacksonville, serving Jacksonville and nearby areas.