Gelco Chimney Cap Installation Nationwide

Gelco Chimney Cap Installation: The Naperville Owner’s Guide

Gelco chimney cap installation in Naperville typically runs $340-$680 for most single-flue applications, including the cap, custom fitting, and sealing. We stock Gelco-compatible caps in common 8″×13″, 13″×13″, and 13″×17″ flue sizes on our Naperville trucks, so most replacements happen same visit once we confirm measurements. Most homeowners discover the problem during a routine sweep or after spotting rust streaks on the brick during spring cleanup - the cap’s been gone or compromised for months by then, and water’s already found its way to the flue liner.

Call (331) 265-1700

Which Gelco Models This Applies To

Gelco caps break down into three main series you’ll see on Naperville homes: the original Gelco pre-fab galvanized line (discontinued around 2015, but still common on 1990s-2000s builds), the current Gelco Stainless series with welded seams and 304-grade construction, and the Gelco Multi-Flue custom units used on larger homes near Hobson West and the Riverwalk corridor where multiple fireplaces share a chimney chase.

The critical compatibility gotcha: pre-fab Gelco caps from the galvanized era used a lighter 26-gauge metal with stamped mesh that rusts through in 7-10 years in Illinois freeze-thaw cycles. If your existing cap is original to a 2005-era home, the mounting flange holes won’t line up with current Gelco Stainless hardware without drilling new anchor points. We carry adapter flanges for this exact scenario.

To identify your series, check the underside label near the mesh screen (if legible after rust) or measure the flue tile opening at the crown. Current Gelco Stainless caps are marked with a part number starting GS-. We source through Haven’s buying network alongside DuraFlex and HeatShield materials, which keeps replacement costs honest compared to single-brand contractors marking up OEM-only stock.

Level Two Chimney Naperville is an independent service provider, not affiliated with Gelco.

Signs Your Gelco Chimney Cap Installation Is Failing

• Rust-colored streaks running down the chimney brick. The cap’s base flange or mesh screen has corroded through, and water is carrying iron oxide down the masonry. In Naperville’s clay-heavy soil zones, that moisture wicks into the brick and accelerates spalling (surface flaking) through winter freeze cycles.
• Visible gaps between the cap edge and the chimney crown. The original sealant has hardened and separated, or the mounting flanges have pulled loose. This lets wind-driven rain enter directly; we’ve found saturated flue liners in Naperville homes within two seasons of this gap appearing.
• Mesh screen is missing, bent, or clogged with debris. The screen keeps animals and large embers out of the flue. A missing screen in Naperville means squirrel and raccoon entry during late fall, especially near the DuPage River greenbelts where wildlife density runs high.
• Cap is sitting crooked or has shifted from center. The mounting hardware has corroded or the crown surface underneath has eroded. A tilted cap channels water toward the low side instead of shedding it evenly, concentrating leak damage.
• Interior flue tile shows staining or efflorescence (white powder). Water is getting past the cap and evaporating inside the flue, leaving mineral deposits. This indicates the cap has been compromised long enough for moisture to migrate down the full flue length.

Before

After

Replacement Cost & What’s Included

What drives the range: flue size (13″×17″ and larger require heavier-gauge material), crown condition (minor resurfacing adds $80-$150 if the mounting surface is eroded), and whether we need to fabricate an adapter for discontinued Gelco mounting patterns. Multi-flue custom caps run $780-$1,400 depending on chase dimensions.

Every installation includes a camera scan of the flue interior before we start - Clause 4 of the Haven Standard requires documented photo evidence of what the cap was supposed to protect. You get the written scope, written price, and written warranty before anyone climbs the ladder. The 365-Day Done Right Promise covers the installation and seal integrity.

DIY or Call Us?

Here’s what you can safely check from the ground: confirm the cap is present and centered, look for rust streaks, and note any mesh damage. Use binoculars. Don’t climb the roof.

The actual replacement involves working at roof edge or chimney height on pitched surfaces, drilling anchor holes into concrete or stone crown material, and applying high-temp sealant that needs dry conditions to cure properly. A misaligned cap voids the warranty and channels water into the flue. Worse, a dropped tool or lost footing on a two-story Naperville colonial is the kind of emergency we don’t want to hear about after the fact.

We carry Gelco-compatible caps, adapter flanges, and sealant on every Naperville truck. Call (331) 265-1700 and we’ll confirm your flue size over the phone, quote the installed price in writing, and schedule the work. The camera doesn’t guess. Neither do we.

FAQs