Sweep & inspection
Caps & crowns
Flue relining
Masonry repair
Gas fireplace serviceLevel 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 Cleaning in Boulder, CO
We provide independent Gelco chimney service across Boulder, from Level 2 inspections to creosote removal and cap replacement. What sets our Gelco work apart here is the freeze-thaw cycle along the Flatirons: it stresses metal components in ways low-altitude cities rarely see, and we know those failure patterns well. Our technicians have up to 9 years of experience with Gelco top-mount dampers, multi-flue caps, stainless liner kits and fireplace inserts. Call (855) 360-7080 for a free estimate.
Why Boulder Residents Choose Us for Gelco Service
Boulder homeowners often call us after a home inspection flags something on a Gelco component, or because a damper has stopped opening and closing the way it should. We’re an independent shop, which means we look at the whole chimney system rather than one part of it. From the first sweep to a full liner repair, we handle the whole flue.
We’re familiar with the Gelco components common in Boulder’s older masonry and prefab fireplaces, and we choose quality parts that actually fit them. We name the brands we install, because you deserve to know what’s going in your home. Scheduling is straightforward: we book a sweep, we inspect with a camera, and you see the evidence before anything is recommended. If a repair can safely wait, we tell you that too.
Styles & brands we work with
- Sweep & inspection
- Caps & crowns
- Flue relining
- Masonry repair
- Gas fireplace service
Common Gelco Chimney Cleaning Problems We Solve in Boulder
These are the Gelco issues we run into most often in Boulder, and the local conditions that drive them:
- Top-mount dampers seizing or warping. Creosote buildup combined with Boulder’s extreme temperature swings leaves many Gelco top-mount dampers stuck open or shut. The metal takes a hard cycle between a hot flue and a cold night, and the moving parts lose their travel over time.
- Multi-flue caps corroding at the welds. Freeze-thaw cycles and pine needle debris work on Gelco multi-flue caps from the outside in. Water sits in the welds, the debris holds moisture against the metal, and the corrosion starts at the joints.
- Stainless liners developing cracks or joint separation. Years of heavy wood burning can open cracks or separate joints in a Gelco stainless liner kit. A liner that looks fine from the firebox can be compromised further up the flue.
- Fireplace insert gaskets failing. A Gelco fireplace insert with a worn gasket burns inefficiently and can spill smoke into the room. New gasket material restores the seal and the burn.
- Hidden masonry damage revealed under Gelco caps and dampers. When we pull a corroded cap or a seized damper, the brickwork underneath often shows mortar joint deterioration that was never visible before. That’s the discovery work a cleaning here often turns into.
Gelco Service in Boulder: What Local Conditions Mean for Your Equipment
Mapleton Hill and Whittier have some of Boulder’s oldest housing stock: original masonry chimneys built before clay flue tile liners were standard. When a Gelco damper or cap on one of those chimneys needs replacing, the job frequently turns up mortar joint deterioration behind the component. The chimney was never lined to begin with, and the parging or mortar that once protected the brick has had a century of heat cycles to crack. Pine needles funneled into flues by canyon winds and packed against caps add moisture and debris to the picture. So a straightforward Gelco cap replacement in Whittier can become a relining conversation before the next heating season. That doesn’t mean every job goes there. It means we inspect the flue with a camera before we quote anything, and we show you what we found.
Gelco Models & Products We Service in Boulder
We service the Gelco components most Boulder owners actually have on their chimneys: the Gelco Top-Mount Damper, the Gelco Multi-Flue Cap, the Gelco Stainless Steel Liner Kit, and the Gelco Fireplace Insert. For critical components like liners, OEM parts give the proper fit and safety margin. For non-critical items like caps and dampers, we’ll use a high-quality aftermarket equivalent when it makes sense and explain the trade-off before we install it. We advise repair over replacement when the chimney structure is sound, and full replacement when a Gelco liner or damper is past reliable function. We’re an independent Gelco service provider, not affiliated with or authorized by the manufacturer, and we don’t claim to be.
See the difference
Before
After
Before
After
Before
AfterGelco Service Pricing in Boulder
Every Gelco job is priced per job by a written estimate, so the range below is a starting point rather than a quote. What drives cost on a Boulder chimney is the condition we find: a seized damper that frees up cleanly, a cap that comes off without exposing failed mortar, or a liner with joint separation each land in a different place.
| Service | Typical estimated range |
|---|---|
| Standard chimney sweep and Level 1 inspection | $175 to $275 |
| Level 2 inspection with camera | $250 to $450 |
| Gelco multi-flue cap or top-mount damper replacement | $300 to $650 |
| Gelco stainless liner repair or relining | $1,800 to $4,500 |
A free estimate includes a camera inspection and photo report, so you see exactly what we see before you commit. Call (855) 360-7080 for an exact figure on your chimney.
Serving Boulder, CO – Our Local Coverage Area
We serve Boulder and nearby communities. Use the map below to see the area we cover. If you’re nearby, we can almost certainly help.
FAQs – Gelco Chimney Cleaning in Boulder
Many stuck Gelco top-mount dampers can be repaired by freeing the mechanism and removing the creosote that’s binding it, but a damper that’s warped from heat cycles usually needs replacement. We inspect it first and tell you which case you’re in. Call (855) 360-7080 and we’ll book an inspection.
Boulder’s freeze-thaw cycles and the pine needle debris that collects on caps both accelerate corrosion at the welds. Water gets into the joints, freezes, expands, and works the metal loose. The cap itself is doing its job; the local climate is just harder on it than a milder one would be.
We recommend a Level 2 inspection annually in a chimney that old, especially with heavy wood burning. A Gelco liner in a pre-liner masonry chimney is worth checking every year for joint separation or cracks. Call (855) 360-7080 to schedule yours.
In most cases yes, a Gelco fireplace insert can be swept in place with the right tools. We do check the gasket and the flue connection while we’re there, since both affect how the insert burns.
A Level 1 inspection covers what’s accessible without special tools, while a Level 2 adds a camera run through the flue and is the right call when there’s been a change in the system or a defect suspected. In Boulder’s older housing stock, a Level 2 is often what a Gelco replacement turns into. Call (855) 360-7080 for a free estimate.
Service Areas Near Boulder
We serve Boulder and the surrounding communities, including Longmont, Arvada, Thornton, Westminster, and Greeley. If you’re just outside the city limits, call and we’ll confirm coverage for your address. You can also read more about our Boulder service and our Gelco work.
Book Your Gelco Service in Boulder Today
Ready to schedule? Call (855) 360-7080. We answer 24/7. Fast dispatch from 7am to 7pm, Sunday through Friday. The estimate is free, the camera inspection and photo report come with it, and you’ll see exactly what we found before anything gets approved.
Written by the team at Chimney Sweep Longmont.