Gelco Chimney Cap Installation Nationwide

Gelco Chimney Cap Installation: The Olympia Owner’s Guide

Gelco chimney cap installation in Olympia typically runs $340-$680 for standard single-flue models, including removal of the failed unit, flue-top inspection, and proper securing to the flue tile or crown. We stock Gelco-compatible caps in 8″, 10″, 12″, and 13″ round sizes plus common rectangular configurations, and most replacements are completed in under two hours. Most Olympia homeowners discover their cap has failed after finding rust stains on the chimney breast, hearing animal activity above the firebox, or noticing water pooling in the firebox after the kind of wind-driven rain the South Sound specializes in.

Call (360) 464-2015

Which Gelco Models This Applies To

Gelco caps break down into three main series you’ll encounter around Olympia: the original Gelco Galvanized line (pre-2010, often marked with a simple stamped “G” and gauge rating), the Gelco Stainless line (304-grade, marked with series numbers like GSC-8 or GSC-10), and the Gelco Multi-Flue collection (wider hood designs for chimney tops with multiple flues or power-vented appliances). The critical compatibility gotcha is flue tile outside diameter versus inside diameter. Gelco’s standard round caps are sized to the flue’s OD, but many Olympia homes built between 1965 and 1995 have oversized flue tiles where the OD measures 13″ but the ID is only 8″. A cap ordered by interior measurement will sit loose and blow off in the first winter storm off Budd Inlet. We measure with a caliper, not a tape eyeball, and we document the reading in your photo record.

OEM Gelco caps ship with their proprietary mesh spark arrestor and a specific tension-band clamp design. Aftermarket equivalents from Olympia Chimney and Famco match the 304 stainless spec and mesh count but use slightly different band geometry. For most Olympia installations, the aftermarket route saves $40-$90 without functional compromise, provided the band engages the flue tile below the crown line. We stock both and will show you the side-by-side before you decide. Corrine Halstead keeps a reference board in the truck with the common Gelco band profiles from the last fifteen years of South Sound installs.

Signs Your Gelco Chimney Cap Is Failing

• Rust streaking down the chimney face. Gelco galvanized caps in Olympia’s marine climate typically show surface rust within 7-10 years, but once the streaking reaches the brick or siding below, the cap base is perforated and water is entering the flue system. The rust accelerates where salt air from the Sound meets morning condensation.
• Mesh screen pulled away from the frame or missing entirely. Raccoons and the non-native eastern gray squirrels common in the Priest Point and Eastside neighborhoods can deform standard 5/8″ mesh. A compromised screen means embers can exit and animals can enter, both of which we’ve documented on camera scans in Olympia homes.
• Cap sitting crooked or visibly lifted from the flue. Gelco tension bands fatigue in freeze-thaw cycles, especially if the original installer set the band too tight and stressed the metal. Once the seal breaks, cap movement in wind grinds the flue tile lip and creates a gap that funnels water directly into the flue.
• Water in the firebox or rust on the damper. This is the symptom that drives most calls. In Olympia’s wet winters, a failed cap admits enough water to pool on the smoke shelf, rust the damper mechanism, and saturate masonry. By the time water reaches the firebox, the cap has been leaking for at least one season.
• Debris or nesting material visible from below. Twigs, leaves, or animal bedding on the smoke shelf mean the cap mesh is breached or the hood has lifted enough to allow entry. We’ve pulled intact squirrel nests from flues near the Capitol Campus where the cap looked fine from the ground but had a 3/4″ gap on the back side.

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Replacement Cost & What’s Included

What drives the range: flue accessibility (steep roof pitch adds time), whether the existing cap has seized bolts or broken bands requiring extraction, and crown condition at the flue top. If the crown is spalled or cracked where the cap seats, we repair it before mounting the new unit. Otherwise you’re replacing the cap again in two years. Every Gelco installation includes a camera scan down the flue to confirm no debris or damage below, a written warranty under our 365-Day Done Right Promise, and the documented photo record required by Clause 4 of the Haven Standard. We source materials through Haven’s buying network, which includes Gelco, Olympia Chimney, and Famco, specifically to keep customer prices honest.

DIY or Call Us?

What you can safely check from inside: shine a flashlight up the flue and note whether you see sky, mesh, or obstruction. If you see sky, the cap is missing or severely displaced. If you see intact mesh but it’s discolored or sagging, the cap is still seated but the screen is compromised. That’s the end of safe homeowner diagnosis.

What goes wrong with DIY replacement: most Gelco caps require working at roofline height with proper fall protection, and the tension-band system exerts enough clamping force that overtightening can crack flue tile or undertightening sends the cap into your neighbor’s yard. We’ve responded to calls in the Tumwater Hill area where a homeowner’s self-installed cap blew off and took a section of crown with it. The camera goes in first. Everything else follows from what it finds. For a written price before anyone starts, call (360) 464-2015.

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