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
After
Before
After
Before
AfterGelco Chimney Cap & Crown in Mount Vernon: What to Know First
We provide independent Gelco chimney cap and crown service in Mount Vernon, with most Gelco cap replacements and crown repairs completed in a single visit after our Level-2 camera inspection. As an independent Gelco service provider, we stock the Gelco model lines common to Westchester County homes and source OEM or quality aftermarket parts based on what your specific flue configuration actually needs. If it needs doing, we’ll tell you. If it doesn’t, we’ll tell you that too. You’ll see the photos, hear the plain-English verdict, and get a fixed price before we start. Call (914) 246-5794 for a free estimate.
This page is for Gelco owners in Mount Vernon who want straight answers about their chimney cap or crown - whether you’re seeing rust streaks on the brick, water in the firebox, or a cap that blew off in a nor’easter off Long Island Sound.
How Gelco Products Fail - and How We Fix Them
- Gelco Multi-Flue caps with welded-seam lids: The 5/8-inch mesh on older Gelco Multi-Flue units fatigues at the weld points after 12 to 18 years of freeze-thaw cycling. In Mount Vernon, where the temperature swings from single digits to 50°F in a March afternoon, that thermal expansion pops the mesh free of the frame. We replace with current-spec Gelco mesh or upgrade to a heavier-gauge aftermarket lid if the flue spacing allows.
- Gelco Single-Flue stainless caps with 3/4-inch overhang: The 304-grade stainless holds up well, but the 3/4-inch drip edge is insufficient for homes near the Hutchinson River Parkway corridor where wind-driven rain hits at an angle. Water runs back to the flue tile. We fit a Gelco cap with extended 1-1/2-inch drip skirts or fabricate a custom overhang when the flue projection is non-standard.
- Gelco top-mount dampers integrated into cap assemblies: The cast-aluminum damper frame corrodes where the cap mounting hardware passes through. Owners smell cold drafts or see daylight up the flue. We separate the cap from the damper mechanism, assess whether the Gelco damper frame is salvageable, and replace with a stainless drop-in damper if the corrosion has pitted the seat.
- Gelco crown wash over clay flue liners: Gelco’s recommended crown slope is 2:12, but many Mount Vernon installers from the 1990s poured flat crowns that pond water. The Gelco cap sits in a puddle half the winter. We grind back to sound concrete, re-pitch to 4:12 minimum, and reseat the cap with a fresh bead of high-temp silicone - never just caulk over the old.
- Gelco galvanized economy caps on oil-flue chimneys: These were common on Mount Vernon’s two-family conversions in the 1980s. The galvanized coating fails from the inside out where sulfur-laden oil exhaust condenses. By the time you see rust on the outside, the cap is paper-thin. We upgrade to Gelco’s 304 stainless or 316 marine-grade if the flue serves a modern high-efficiency boiler with lower stack temperatures.
Our Gelco Chimney Cap & Crown Process
- 1
Call and schedule: A live person answers, 24 hours a day. We book a two-hour window. No app, no callback tag.
- 2
Level-2 camera inspection: Our tech runs a camera up the flue before touching the cap or crown. You see the footage on a tablet. We document flue tile condition, creosote buildup, and whether the crown has cracked beneath the cap.
- 3
Parts decision: We check Gelco part numbers against your flue dimensions. If Gelco OEM is back-ordered or discontinued for your series, we specify a quality aftermarket equivalent from our DuraFlex or Famco inventory - never a big-box substitute. You approve the part and the price before we proceed.
- 4
The repair: For crown work, we grind to sound substrate, apply a bonding agent, and pour a new Portland-based crown wash with proper slope and drip edge. For cap replacement, we verify flue projection height per Gelco’s clearance specs and anchor with stainless tapcons, not powder-actuated fasteners that shatter old brick.
- 5
Test and document: We run a draft test with the new cap in place, check for obstruction with a mirror, and photo-document the finished work. Your report includes before-and-after images and a plain-English verdict on anything else the flue needs.
- 6
Cleanup and guarantee: We haul away the old cap. Your 90-Day Done Right Promise goes in writing before we leave - if it’s not right, we make it right, no paperwork, no arguing.
What Gelco Chimney Cap & Crown Costs in Mount Vernon
| Service | Typical Range |
|---|---|
| Gelco single-flue cap replacement (stainless) | $280 - $420 |
| Gelco multi-flue cap replacement | $450 - $680 |
| Crown repair with Gelco cap reseat | $520 - $780 |
| Full crown rebuild with new Gelco cap | $1,200 - $1,850 |
| Gelco top-mount damper cap assembly | $650 - $950 |
What moves the price: flue height above the roofline, accessibility (steep pitches cost more in labor time), whether the crown needs structural rebuild versus surface repair, and whether we find hidden flue damage during inspection. We do not upsell liner work unless the camera shows it and you see it yourself. Call (914) 246-5794 for an exact quote - estimates are free.
Why Mount Vernon Homeowners Call Hearthstone Chimney Co. for Gelco Work
We’ve been answering the phone with a live person for over 42 years, and Russell Haines has spent the better part of two decades working chimneys across Westchester. His crew knows the older two-families near Fleetwood where Gelco caps were installed by the dozen in the 1990s - and where they are failing now. We carry Gelco, DuraFlex, HeatShield, and the other professional-grade brands so we are not forcing a part that doesn’t fit. The 90-Day Done Right Promise is in writing before we leave. Photos you can see, a plain-English verdict. A square deal: no surprises on the bill.
FAQs
No. Gelco’s limited lifetime warranty on stainless caps covers manufacturing defects regardless of who installs it, provided the cap is not modified. As an independent Gelco service provider, we install to Gelco’s written specs and document with photos so any future warranty claim is straightforward. Call (914) 246-5794 if you have a specific Gelco warranty question - we’ll pull the paperwork for your model series.
Most Gelco series from the past 25 years are still in production or have direct-fit aftermarket equivalents in our DuraFlex and Famco inventory. The discontinued Gelco galvanized economy line requires a full cap replacement - we cannot source matching lids. We stock the common stainless Gelco sizes for Mount Vernon flue dimensions and can fabricate custom if your chimney has an unusual projection height or multi-flue spacing.
Repair the crown if the cracks are surface-level and the cap frame is sound. Replace the cap assembly if the mesh is rusted through, the lid is warped, or the mounting flange has corroded where it meets the crown. Our camera inspection shows you which category you’re in. We do not recommend full replacement when a crown reseat and new silicone bead will last another decade.
We book within a few days during sweep season, longer if you’ve had a storm event and half the neighborhood is calling. Most Gelco cap and crown jobs are completed in a single visit once scheduled. We do not promise same-day dispatch, but we do promise we’ll be there when we say. Call (914) 246-5794 to check current availability.
Water in the firebox, rust stains on the exterior brick below the cap, or a draft that reverses on windy days are the three most common signs. But we’ve also found that a “leaking cap” was actually deteriorated flue mortar or a cracked crown beneath it. That’s why we camera-inspect first. You’ll see what we see, and we’ll tell you whether the Gelco cap, the crown, or the flue itself needs attention.
Written by Russell Haines, Owner, Hearthstone Chimney Co. at Hearthstone Chimney Co., serving Mount Vernon and nearby areas.