Level 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.
Why Denton Homeowners Choose Gelco Chimney Cleaning
Emberly Chimney Cleaners Denton provides independent Gelco repair in Denton, including chimney cleaning and replacement service throughout Denton, TX, with camera-scan inspection and a written price before any work starts. We are not authorized or endorsed by Gelco; we are an independent service company that has worked on Gelco stainless liners, caps, dampers, and prefab fireboxes across Denton County since 2009. Our technicians carry Gelco-compatible parts on most trucks, and every job includes a documented photo record under Clause 4 of the Haven Standard. Call (940) 373-6912 for a free estimate.
Gelco systems are common in Denton homes, especially the 1940s-1960s bungalows and student rentals near the University of North Texas campus where wood-burning fireplaces with aftermarket stainless liners were retrofitted to aging clay-tile chimneys. Corrine Halstead, our owner, learned the trade at Apex Technical School in Manhattan and spent nearly two decades in the field before putting down roots here. She and our crew have cleaned and inspected chimneys throughout Denton, including Gelco Chimney Cleaning in Corinth, TX and a stretch of older wood-burning fireplaces near the historic Denton Square where creosote buildup runs heavier than most homeowners expect. The camera doesn’t guess - and neither do I.
Why Trust Emberly Chimney Cleaners Denton for Your Gelco Chimney Cleaning?
We know how Gelco products age in North Texas. The stainless steel flexible liner kits that Gelco popularized for wood-burning retrofits hold up well under normal use, but Denton’s pattern of long idle periods followed by intense freeze-driven burns creates a specific stress profile. Moisture collects in the flue during months of disuse. When a blue norther drops temperatures fast and the fireplace runs for days straight, that trapped moisture flash-evaporates, drives creosote deep into liner joints, and accelerates corrosion at the top connector where the liner meets the cap. We’ve seen it dozens of times in Denton rentals and Gelco in Krum.
Our technicians carry Gelco-compatible caps, dampers, and liner components on most service vehicles. When OEM Gelco parts are discontinued or on backorder, we source quality aftermarket equivalents through our Haven buying network that meet or exceed original specifications. We document everything: camera footage down the flue, photos of the cap and crown from the roof, and a written scope with price before any tool touches your chimney. That’s Clause 1 of the Haven Standard. Clause 4 requires the photo record. We’ve done it on all 38,000-plus jobs since 2009.
Corrine Halstead trains our crew personally on Gelco prefab firebox panels, which crack predictably around the damper throat after repeated thermal cycling. She shows new techs the camera footage first, invoice second - the same way she treats customers. Background-checked, uniformed technicians. License number on every page. A text when we’re on the way.
Common Gelco Chimney Cleaning Problems We Fix in Denton

- Pinhole corrosion and joint separation in Gelco stainless liners. Gelco’s flexible liner kits are built from 316Ti stainless, but years of creosote accumulation combined with Denton’s humidity and freeze-thaw cycles eat the top connector first. Moisture wicks down between the liner and clay tile, then corrodes from the outside in. We catch this with our camera scan - the separation is usually invisible from the roofline and undetectable without a flue inspection. Left alone, combustion gases leak into wall cavities. In the Oak-Hickory Historic District and surrounding UNT rental stock, we find this on chimneys that haven’t been inspected since the Clinton administration.
- Warped or rusted Gelco top-mount caps. Gelco’s top-mount and multi-flue caps use a galvanized mounting flange and stainless mesh that eventually succumbs to Denton’s combination of UV exposure, hail, and acidic creosote runoff. The screen rusts through first, then squirrels and starlings move in. Water follows. We stock Gelco-compatible replacement caps with heavier-gauge mounting hardware and can usually swap one same-visit if the flue is otherwise sound.
- Cracked Gelco prefab firebox panels. Gelco prefab units use refractory panels that expand and contract with every burn cycle. After enough winters - especially the kind of sporadic, high-intensity use Denton sees - the panel around the damper throat develops hairline cracks that widen into gaps. Combustion gases escape behind the surround. We evaluate whether panel replacement is sufficient or if the firebox structure has degraded beyond safe repair. We tell you honestly which it is.
- Seized Gelco dampers. Soot and creosote glaze the damper mechanism until it won’t open, won’t close, or hangs crooked in the throat. A stuck-open damper wastes conditioned air year-round. A stuck-closed damper fills your living room with smoke on light-off. We disassemble, clean, and lubricate where possible; replace with a quality aftermarket unit when the original is too corroded to seal. The decision comes after inspection, not before.
- Moisture damage from long idle periods. This is Denton’s special. A Gelco liner in a chimney that hasn’t burned since the last hard freeze sits collecting condensation for months. The crown cracks. The flashing separates. Then Winter Storm Uri Part Two arrives, the landlord tells the tenants to light a fire, and nobody checks whether the chimney is clear of debris or structurally intact. We sweep, inspect, and document condition so there’s a record before the first match.
Before
AfterGelco Parts & Our Repair-vs-Replace Approach
We don’t automatically replace what we can repair. A Gelco damper with surface corrosion and heavy soot buildup often cleans up and reseals. A Gelco cap with a rusted screen but sound base gets a new screen assembly, not a full cap. But when a Gelco stainless liner shows pinholes at multiple joints, or a prefab firebox panel is cracked through to the metal wrapper, we say so plainly and show you the camera footage.
Our parts come through Haven’s buying network: DuraFlex for liner components, HeatShield for refractory repair, and Gelco-compatible caps and dampers from Olympia Chimney, Famco, and Copperfield when OEM is unavailable. We stock the fast-moving items locally for same-visit resolution. Every recommendation includes a written price, written scope, and written warranty before work starts. Clause 1. No exceptions.
If you’re staring at a competitor’s estimate for Gelco work you don’t fully understand, bring it to us. Free Second Opinion. Written or nothing. Call (940) 373-6912.
Our Gelco Service Process - Step by Step

- 1
Diagnosis with camera-scan inspection. We run a chimney camera down the full length of your Gelco flue liner, photograph the cap, crown, and firebox from the roof and hearth, and record damper operation. You see what we see. This is NFPA 211 Level 2 standard, and it’s been our default since 2009 - years before insurers started asking for documentation.
- 2
Written scope and price before any work. We deliver a written estimate with line-item pricing: sweep, cap replacement, damper repair, liner reseating, or panel replacement. No verbal quotes. No “we’ll see how it goes.” You approve in writing or we stop there.
- 3
Repair or install with Gelco-compatible parts. Our technician performs the approved work using the parts specified in your scope. Background-checked, uniformed, with a license number you can verify. We text when we’re en route.
- 4
Test burn and documentation. We fire the system, check draft and spillage, and confirm proper operation. Then we deliver your documented photo record - Clause 4 of the Haven Standard - with dated images of before, during, and after. Your archive for insurance, resale, or next year’s comparison.
- 5
Warranty and follow-up. Every Gelco service is backed by our 365-Day Done Right Promise. If it’s not done right, we make it right. The warranty is written, dated, and stamped.
Gelco Products We Service & Install in Denton
We work on Gelco stainless steel flexible chimney liner kits (standard and heavy-wall for wood-burning fireplaces and inserts), Gelco top-mount and multi-flue chimney caps, Gelco prefabricated fireplace and insert units, and Gelco replacement dampers and firebox components. We stock compatible caps, dampers, and liner connectors for fast turnaround on the most common failures. For discontinued Gelco prefab models, we evaluate whether aftermarket panels or a unit replacement is the safer path. We don’t sell you a full rebuild when a panel swap and our Chimney Sweep services will do.
We Also Service These Brands

Our technicians are trained across multiple manufacturer systems. We regularly install and repair DuraFlex liner products and apply HeatShield refractory resurfacing systems. Our multi-brand capability means we evaluate your chimney’s actual condition without pushing a single product line. Independent. Honest. Documented.
FAQs - Gelco Chimney Cleaning Service in Denton
No. We are an independent service company with no affiliation, authorization, sponsorship, or endorsement from Gelco. We service Gelco products based on field experience and technical knowledge, not manufacturer certification. Our 365-Day Done Right Promise and Haven Standard documentation apply to all work we perform.
We use OEM Gelco parts when available and cost-effective. When Gelco OEM is discontinued or on extended backorder, we install quality aftermarket components that meet or exceed original specifications, sourced through our Haven buying network from Olympia Chimney, Famco, and Copperfield. We specify which type you’re getting in your written estimate.
A standard Gelco chimney sweep and inspection takes 60-90 minutes. Cap replacement or damper repair adds 30-60 minutes. Liner reseating or prefab panel replacement can run 2-4 hours depending on access and condition. We give you a time estimate in writing with your scope.
We service all Gelco stainless flexible liner kits, top-mount and multi-flue caps, prefabricated fireplaces and inserts, and replacement dampers and firebox components. If you have a model number, call (940) 373-6912 and we’ll confirm parts availability before scheduling.
Gelco’s original product warranty, where still active, typically requires installation by a qualified professional following manufacturer guidelines. Our work is performed to NFPA 211 standards with full documentation. We cannot guarantee Gelco’s warranty decisions, but we provide the written record and photo documentation that warranty claims require. Ask us about your specific situation before we begin.
Gelco chimney cleaning and inspection in Denton typically runs $199-$289 for a standard sweep with camera-scan documentation. Cap replacement ranges $180-$340 depending on size and access. Damper repair or replacement runs $220-$450. Prefab firebox panel replacement starts around $400 and can exceed $800 if multiple panels or structural work is needed. Exact pricing requires inspection - estimates are free, written, and delivered before any work starts. Call (940) 373-6912 to schedule.
Book Your Gelco Service in Denton, TX

Call (940) 373-6912 for a free written estimate on Gelco chimney cleaning, repair, or replacement in Denton. Live person answers, 24 hours a day. Camera-scan inspection and documented photo record included. Written price before work starts. 365-Day Done Right Promise. Corrine Halstead and our crew are ready when you are.
Written by Corrine Halstead, Owner at Emberly Chimney Cleaners Denton, serving Denton since 2009.





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