Gelco Chimney Cap Installation in Jacksonville, FL

Gelco Chimney Cap Installation: The Jacksonville Owner’s Guide

Gelco chimney cap installation in Jacksonville typically runs $340-$780 depending on flue count and whether your crown needs repair before the cap goes on. We stock Gelco single-flue and multi-flue caps for the most common clay flue tile sizes used in Northeast Florida homes built between 1960 and 1995, and we can usually get yours measured and installed the same day you call. Most homeowners figure out their cap is failing when they spot rust streaks running down the brick or find water in the firebox after a summer thunderstorm rolls through.

Call (833) 974-6113

Which Gelco Models This Applies To

Gelco caps break down into two main families: the single-flue “Ultra” series with outside-mount legs that grip the flue tile directly, and the multi-flue “Crown Mount” series that sits on the concrete crown and covers two or more flues at once. The critical measurement is always the outside dimension of your flue tile, not the inside opening - a 13×13 flue tile takes a different leg spread than a 13×13 interior opening would suggest. We’ve seen homeowners in San Marco and Avondale order the right model number for their flue size but get the wrong mount style, then wonder why the cap won’t seat.

Gelco stamps a small model tag on the underside of the mesh screen on most units made after 2012. If your tag is gone or rusted illegible, measure the flue’s outside width and depth with a tape measure, then the total crown width if you’re looking at a multi-flue unit. We carry both OEM Gelco caps and the CrossWire equivalent, which uses the same 304 stainless mesh and 24-gauge lid but costs about 15% less. For coastal ZIP codes like 32225 and 32233, we default to the 316 marine-grade stainless upgrade - the salt air here eats 304 faster than inland owners might expect.

Signs Your Gelco Chimney Cap Installation Is Failing

• Rust stains on the brickwork below the cap. Gelco lids are 24-gauge stainless, but the spot-welded corners and the mesh-to-lid connection points are where moisture first gets a foothold. In Jacksonville’s humidity, once you see orange streaking, the metal is already thinning.
• Mesh screen pulling away from the lid frame. This happens when the spot welds fail from thermal cycling - your flue hits 400°F on a January evening, then ambient the next morning. Squirrels and roof rats in Riverside and Ortega exploit this gap within days.
• Cap sitting crooked or lifted on one side. The leg bolts on single-flue models loosen over years of expansion and contraction, or the concrete crown beneath a multi-flue cap has cracked and dropped. A tilted cap channels water directly into the flue instead of shedding it.
• Water in the firebox or rust on the damper. By the time you notice this inside, the cap has been compromised for at least one rainy season. Jacksonville’s afternoon thunderstorms in July and August will find any gap.
• Debris or animal nesting material on the smoke shelf. Gelco’s 5/8-inch mesh is designed to stop birds and squirrels while letting smoke pass. When the mesh corrodes or gaps open, animals move in - we’ve pulled nests from caps that looked fine from the ground.

Replacement Cost & What’s Included

The price spread depends on three things: how many flues you’re covering, whether we need to pour a crown wash or repair cracks before the cap gets anchored, and whether your roof pitch requires us to set up on the ridge instead of walking the surface safely. Every estimate includes removal of the old cap, inspection of the flue tile and crown condition, installation with stainless hardware, and cleanup. Our 90-Day Done Right Promise covers the installation in writing - if water gets past that cap, we come back. No paperwork to dig up, no arguing.

DIY or Call Us?

There’s one thing a homeowner can check safely from the ground: whether the cap is visibly tilted, missing, or has mesh hanging loose. Use binoculars. If you see any of that, the cap needs attention.

Everything else belongs on a roof with a trained technician. Gelco caps aren’t heavy, but installing one requires working at height on a surface that may be slick from Jacksonville’s morning dew or afternoon rain. More importantly, a cap that isn’t seated squarely or bolted with the right tension will leak within a season - and you won’t know until you see the water damage inside. We complete most cap replacements in a single visit, and the estimate we give over the phone is the number on the invoice. Call (833) 974-6113 when you’re ready.

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