Sweep & inspection
Caps & crowns
Masonry repairLevel 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 Yonkers Owner’s Guide
Gelco chimney cap installation in Yonkers typically runs $225 – $425 installed, depending on the cap size, flue configuration, and whether the mounting base needs repair before the new cap goes on. We stock Gelco-compatible caps on the truck for the most common flue sizes in Yonkers homes, so most installations are a single-visit job. Most owners discover their cap failed one of two ways: they spot rust staining on the chimney crown from the ground, or they hear water dripping into the fireplace during a storm. Both mean the same thing, your cap stopped doing its job.
Which Gelco Models This Applies To
If you’re holding a Gelco cap and the box or label is still readable, you’ll see one of their series names: the Standard series, the Wind-Rain series, the Deluxe Multi-Flue series, or stainless variants of each. The most common call we get in Yonkers is for caps sized to fit a standard single-flue clay tile, usually in the 8″x8″ to 13″x13″ range, measured on the outside of the tile. The quick check: measure the outside width and length of your flue tile at the top, then match to the cap’s stated “flue ID” range. One Gotcha worth knowing: Gelco caps are built to mount with locking tabs that tighten against the inside of the tile, not the outside edge. If the tile lip is chipped or deteriorated, the cap won’t seat properly no matter how tight you crank it, and that’s the number one reason a brand-new Gelco cap ends up crooked or rattling loose in a Yonkers winter wind.
When it comes to OEM versus aftermarket equivalents, the honest truth is that Gelco’s stainless models hold their finish longer in salt-air coastal conditions than most generic versions, which matters in parts of Yonkers where winters mean ice melt and road spray. Copper Gelco caps are also matched for the specific fastening system Gelco uses. If a no-name cap can be made fit, we’ll tell you. If the fit isn’t right, we’ll tell you that too. Hadley Chimney Yonkers is an independent service provider, we’re not the manufacturer, which means our recommendation is based on what works, not what moves inventory.
Styles & brands we work with



Signs Your Gelco Chimney Cap Installation Is Failing
- Water in the firebox after rain. The cap’s hood, mesh band, or the seal around the base has failed, letting rain run straight down the flue instead of diverting around it.
- Rust streaks on the chimney crown or brick face. If it’s a galvanized Gelco cap, the coating has worn through and the cap body is now rusting, staining the masonry below it.
- Cap wobbles or sits crooked when you look at it from the ground. The locking tabs have worked loose, or the tile lip cracked, and every gust off the Hudson is shifting the cap against the tile.
- Animal noise – scratching, chirping, or rustling above the damper. The expanded mesh band on a Gelco cap has gaps or has pulled away from the hood, letting squirrels or birds in.
- Rust particles or fine debris washing onto the firebox floor. The mesh or the hood has become so corroded that pieces are breaking off and landing where your firewood goes.
See the difference
Before
After
Before
After
Before
AfterReplacement Cost & What’s Included
Most single-flue Gelco chimney cap installations in Yonkers fall between $225 and $425. The spread comes down to three things: the size of your flue tile, whether you want galvanized, painted stainless, or copper, and whether the existing cap left behind damaged flue tile that needs to be cleaned up first. You get a written price before any work starts, every single time, so the invoice matches the quote and nothing gets added once we’re already on the roof.
Every cap install includes removing the failed cap, checking the flue tile lip for cracks or chipping, dressing the tile face if needed, setting the new Gelco cap with its locking system, and photo documentation of the finished job. The cap itself carries Gelco’s manufacturer warranty, and our installation work is covered by the 365-Day Done Right Promise: if the cap shifts or comes loose within a year, we come back and fix it free, backed by a written guarantee on every repair.
DIY or Call Us?
Working on a chimney cap means being on a roof, and a Yonkers roof in any season with any pitch is not where you want to learn how flue caps work. If your chimney is reachable from a low-pitch roof with a straight path and you have the right ladder and a spotter, you could reasonably inspect the cap from eyeball distance and confirm what’s wrong. Changing it yourself on a steep roof with tools in one hand while trying to center a cap on a slippery flue tile is how people end up injured. The cap itself isn’t dangerous to handle, the height and footing are.
If you’re not comfortable on that particular roof, that’s the right call, and it’s why we’re happy to be the ones up there. Our techs are background-checked, uniformed, and trained to work on Yonkers rooftops without drama. Call (914) 233-3156 and we’ll get your cap sorted without you leaving the driveway.
FAQs
Expect 8 to 12 years from a galvanized Gelco cap and 15+ from a stainless or copper one in Yonkers weather. Snow, road salt, ice, and persistent moisture in the air all cut lifespan compared to drier regions, so the galvanized models show their age faster up here. We can tell the difference between “seasoning” and “ending” when we see it.
Sometimes, if the failure is limited to a loose mounting tab or a small mesh tear. If the hood is rusted through or the mounting base is warped, replacement is the only real fix, and usually the cheaper one by hour two. We’ll show you photos so you can see exactly what we’re seeing before you spend anything.
Most Gelco cap installations are done in under an hour once the tech is on the roof. That includes removing the old cap, checking and dressing the flue tile, setting the new cap, and taking photos of the finished job for you.
We carry the most common Gelco single-flue sizes on the truck for Yonkers homes, plus compatible hardware. If your flue is an unusual size, we order the right Gelco part and return to install it, with the delivery timeline confirmed to you before any money changes hands. We also work with DuraFlex and HeatShield materials when a cap install turns into a liner conversation, and we’ll show you why if it does.
Written by Cory Mitchell, Owner, Hadley Chimney Yonkers at Hadley Chimney Yonkers, serving Yonkers and nearby areas.