Gelco Chimney Cap Installation Nationwide

Gelco Chimney Cap Installation: The Evanston Owner’s Guide

Gelco chimney cap installation in Evanston typically runs $340-$620 for most single-flue masonry setups, including removal of the failed unit, flue measurement, and proper mounting with corrosion-resistant fasteners rated for Lake Michigan salt air. We stock Gelco-compatible caps in common sizes and can usually install within 48 hours of your call. Most Evanston homeowners discover the problem after a windstorm off the lake tears a loosened cap loose, or when water stains appear on the firebox ceiling below a cap that’s lost its mesh screening.

Call (708) 234-1174

Which Gelco Models This Applies To

Gelco caps break down into three series you’ll encounter around Evanston: the original Gelco Galvanized line (discontinued around 2015 but still mounted on many pre-2010 homes), the Gelco Stainless Steel series (GSC prefix), and the Gelco Multi-Flue collection for larger masonry stacks common in the lakefront historic district. The galvanized units were sold in nominal sizes - 8×8, 8×13, 13×13 - that refer to flue opening, not outside dimensions. That’s the first compatibility gotcha: a homeowner measures the cap lid at 15 inches square and orders a 13×13, only to find the flue collar is too small by two inches.

We carry both OEM Gelco stainless caps and aftermarket equivalents from Famco and Copperfield through our Haven buying network. For the GSC series, we match by flue inside dimension and mounting style: outside-mount tabs (most common in Evanston’s clay flue tiles) versus inside-mount compression models for metal chimneys. If your existing cap still has a legible stamp on the collar underside, photograph it - that’s the fastest match.

Signs Your Gelco Chimney Cap Is Failing

• Rust streaks down the chimney face. Gelco’s galvanized line used a zinc coating that thins faster in Evanston’s freeze-thaw cycles, especially where roof runoff splashes the chimney base. Once the coating fails at the seam welds, rust bleeds down the brick within a single season.
• Mesh sides pulled outward or missing entirely. Squirrels and raccoons in Evanston’s tree canopy test every cap. Gelco’s stainless mesh resists chewing, but if the mounting tabs loosen, animals pry the whole screen section off to access nesting warmth.
• Cap sits crooked or rocks when touched. The original Gelco mounting system used two screws through the flue tile lip. After 10-15 Illinois winters, thermal expansion cracks the tile edge; the screws no longer bite, and lake winds finish the job.
• Water in the firebox after heavy rain. A Gelco cap with a cracked or hail-dented lid lets water channel directly down the flue. In Evanston, we see this most after spring storms off the lake when the cap lid has fatigued from years of UV exposure.
• Smoke backup on windy days. The Gelco design relies on a minimum 5-inch clearance between cap lid and flue opening for proper draft. If the cap has shifted downward on bent tabs or if a previous installer chose an oversized lid, the downdraft pressure traps smoke in the firebox.

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Replacement Cost & What’s Included

What drives the range: flue accessibility (steep roofs above 8/12 pitch require additional safety rigging), whether the existing mounting surface is sound, and cap size. Every Gelco installation we perform includes a camera scan of the flue interior before we mount the new cap - Clause 4 of the Haven Standard requires it - so you see the condition we see. Your written price, written scope, and written warranty are delivered before work starts. We source materials through our Haven buying network specifically to keep customer prices honest.

DIY or Call Us?

You can safely check three things from the ground or roof edge: whether the cap still sits level, whether mesh is intact, and whether water stains have appeared on the chimney face below it. What you cannot safely assess is the flue tile condition beneath the cap - cracked mounting edges collapse underfoot, and a cap that feels secure may be hanging on two corroded screws in crumbling clay.

We’re not affiliated with Gelco; we’re an independent service provider. Corrine Halstead and our crew have replaced Gelco caps across Evanston, including stacks where the galvanized original lasted 22 years and others where lake-front salt air destroyed stainless mesh in eight. The camera doesn’t negotiate - and neither does creosote. For a written price before any work starts, call (708) 234-1174.

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