Gas fireplace service
Sweep & inspection
Caps & crowns
Flue relining
Masonry repairLevel 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 San Antonio Homeowners Choose DuraFlex Chimney Cleaning
DuraFlex chimney cleaning in San Antonio is a specialized service that goes far beyond a standard Chimney Sweep. Our crews work on DuraFlex stainless steel liners every week across the city, and we understand the specific ways these products age in San Antonio’s climate: humidity-driven corrosion, creosote adhesion from unseasoned oak, and thermal stress at connection points. As an independent DuraFlex service provider, we are not authorized by or affiliated with the manufacturer, but our technicians are factory-trained on DuraFlex specs and have installed, inspected, and repaired hundreds of these liners in San Antonio homes. If your DuraFlex liner needs cleaning, a Level 2 inspection, or repair work, call (361) 491-3153 and we’ll give you a written price before anything starts.
What makes our DuraFlex work different is simple: we show you exactly what we find. Danny Cortes, owner of Kindling Chimney San Antonio, keeps a notebook on every job and sketches flue conditions so you can see what he sees before a single brush goes in. That habit has served San Antonio families well, from Alamo Heights bungalows to newer builds north of Loop 1604, and we also provide San Antonio Duraflex service throughout the area. A clean flue is the quietest safety feature in your home, and we’ll make sure yours is doing its job.
Why Trust Kindling Chimney San Antonio for Your DuraFlex Chimney Cleaning?
DuraFlex liners are engineered products with tight tolerances and specific material properties. A technician who treats a 316L flexible liner the same as a terra cotta flue can cause real damage: over-aggressive brushing, wrong-size tools, improper termination sealing. Our crew knows the difference. We run DuraFlex-specific diagnostics on every visit, measuring draft, checking connector joints, and video-scanning the liner interior when the situation calls for it.
Danny grew up in Los Angeles and picked up his trade fundamentals at Los Angeles Trade-Technical College before spending the better part of two decades working chimneys up and down the Southwest. He and his crew have served San Antonio families for years. Factory training on DuraFlex product specifications means we know which cleaning methods are safe for Smooth Wall laminate liners versus Pro 316Ti heavy-duty flex. That matters when you’re deciding whether a liner just needs a thorough cleaning or whether it’s reached the end of its service life.
Every DuraFlex chimney cleaning we perform in San Antonio is backed by the 365-Day Done Right Promise. If the work isn’t right, Kindling makes it right. No fine print. We also operate under the Cedarwell Care Promise on every visit: shoe covers and drop cloths go down on arrival, nothing is moved without asking, and a photo of the clean-up is taken before the crew leaves. You’ll have a written price in hand before any work begins.
Styles & brands we work with
Common DuraFlex Chimney Cleaning Problems We Fix in San Antonio
- Pinhole corrosion in DuraFlex SS 316L liners. This is the most common DuraFlex failure we see in San Antonio, and it usually traces back to acidic condensate. When a high-efficiency gas appliance vents through a 316L liner, the flue gases cool too quickly and create condensate that eats through the alloy over time. We find these pinholes concentrated in the lower third of the liner, right where the flue gas temperatures dip below the dew point.
- Creosote accumulation from unseasoned oak. San Antonio burns a lot of oak, and a lot of it goes into the fireplace before it’s fully seasoned. Green oak produces wet, sticky creosote that adheres aggressively to flexible liner walls, especially at offset angles where the liner flattens slightly and disrupts laminar flow. The buildup doesn’t just restrict draft. It creates a legitimate fire hazard that a standard sweep alone won’t resolve if the liner has already been compromised.
- Kinking or ovalization at offset angles. Flexible DuraFlex liners can deform when they’re pulled through tight offsets or when they’re not properly supported. Once a liner ovalizes, draft suffers and creosote builds faster in the deformed section. We identify this with a video scan and recommend replacement when the kink exceeds safe tolerances.
- Separation at the tee snout connection. The joint where the tee snout meets the appliance flue collar takes a beating from thermal expansion cycles. San Antonio winters aren’t brutal, but they do cycle enough to loosen that connection over time. When it separates, combustion gases leak into the chase rather than venting outside. This is a safety issue we flag immediately.
- Delamination of the inner foil on Smooth Wall laminate liners. DuraFlex Smooth Wall liners have a thin inner foil layer bonded to the structural wall. When that foil delaminates, the surface becomes rough and sandy to the touch. Soot and creosote cling to the roughened surface, and cleaning becomes less effective each cycle. We see this on liners that have been aggressively brushed or exposed to excessive heat.
DuraFlex Parts & Our Repair-vs-Replace Approach
We source genuine DuraFlex parts, including liners, connectors, top plates, and caps, from authorized distributors to ensure precise fit and material compatibility. When a liner has localized pinholes but the surrounding metal is structurally sound, we can perform a welded 316L patch repair. That’s a cost-effective fix that extends liner life by years in the right circumstances. But we’re honest about when patching doesn’t make sense. Widespread corrosion, kinked sections, or a liner that’s already had multiple patches is a replacement candidate. Patching compromised flex liners often leads to early re-failure, and we’d rather tell you that upfront than sell you a repair that won’t hold.
If you’re weighing repair against replacement, call (361) 491-3153 and we’ll walk you through what we found with video evidence. Nothing gets recommended without camera documentation you can see for yourself.
Our DuraFlex Service Process – Step by Step
- 1
Diagnosis. We start with a visual inspection of the liner termination, connector joints, and accessible flue sections. If conditions warrant, we run a video scan down the entire liner length and measure draft with a manometer. You see everything we see.
- 2
Cleaning or repair. For cleaning, we use brush sizes and stiffness matched to your specific DuraFlex liner profile. For repairs, we source the exact DuraFlex component needed, whether that’s a replacement tee snout, a new top plate, or a welded 316L patch segment.
- 3
Testing. After any cleaning or repair, we perform a post-service draft test to confirm the flue is pulling correctly. For liner repairs, we also run a leak test before we call the job done.
- 4
Documentation and warranty. You get a written report of what we did, what we found, and what we recommend. Every job is covered by the 365-Day Done Right Promise. If something isn’t right, we make it right.
See the difference
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AfterDuraFlex Products We Service & Install in San Antonio
We service and install the full range of DuraFlex chimney liner products in San Antonio homes. That includes the DuraFlex SS 316L flexible chimney liner, the DuraFlex Pro 316Ti heavy-duty flexible liner for high-temperature applications, the DuraFlex AL 29-4C high-temp rigid liner for gas appliances, and the DuraFlex Smooth Wall laminate liner where reduced soot adhesion is a priority. We keep common connector sizes, top plates, and caps in local stock for faster turnaround on San Antonio jobs.
We also provide Level 2 inspections, creosote removal, chimney waterproofing, and flashing repair as part of our DuraFlex service envelope, including New Braunfels Duraflex service for homes outside the city. A liner is only as good as the chimney system around it.
We Also Service These Brands
While DuraFlex is a specialty we know well, our San Antonio crews also work extensively with HeatShield and Gelco products, and we offer Duraflex in Converse and surrounding communities. If your chimney has a different liner brand or a hybrid system, we’re equipped to handle it. Multi-brand experience means we can give you honest recommendations about what’s actually best for your chimney, not just what we happen to stock.
FAQs – DuraFlex Chimney Cleaning Service in San Antonio
No. We are an independent DuraFlex service provider. We are not authorized by or affiliated with the manufacturer. Our technicians are factory-trained on DuraFlex product specifications, and we source genuine DuraFlex parts from authorized distributors, but we operate independently. That means our recommendations are based on what we find in your chimney, not on a manufacturer’s sales targets.
Yes. We source genuine DuraFlex liners, connectors, top plates, and caps from authorized distributors. For repairs that don’t require OEM components, we use materials that meet or exceed the original spec. We’ll never substitute a lower-grade material on a DuraFlex repair. Call (361) 491-3153 and we’ll quote the exact parts your job requires.
If your liner has widespread pinhole corrosion, visible kinking, or separation at the tee connection, cleaning alone won’t fix it. The telltale signs are draft problems that persist after a sweep, visible rust stains on the chimney exterior, or a video scan that shows perforation. A localized pinhole can sometimes be welded and patched. Widespread corrosion means replacement. We’ll show you the video evidence and explain exactly where your liner falls on that spectrum.
Most standard steel brushes are safe for the SS 316L and Pro 316Ti liners, but brush pressure and diameter matter more than people assume. The Smooth Wall laminate liner has a thinner inner foil layer that can be damaged by aggressive brushing or oversized tools. We match brush type and size to your specific liner model. Using the wrong tool can turn a $250 cleaning into a $3,000 liner replacement.
That rough, sandy texture is usually delamination of the inner foil layer. The Smooth Wall liner has a thin bonded foil that starts to separate after years of thermal cycling or over-aggressive cleaning. Once the foil delaminates, the surface becomes porous and soot adheres more readily. Cleaning helps temporarily, but the liner’s smooth-surface benefit is gone. Depending on the extent, a partial reline or full replacement may be the right call. Call (361) 491-3153 for an assessment with video evidence.
Any creosote buildup beyond 1/8 inch is a fire hazard regardless of liner material. The Pro 316Ti alloy is tougher than standard 316L and resists higher temperatures, but that doesn’t make it creosote-proof. In San Antonio, where unseasoned oak is common, we recommend an annual inspection and cleaning for wood-burning DuraFlex liners. If you skip it, the creosote creates a thermal load the liner wasn’t designed to handle indefinitely. Call us at (361) 491-3153 to schedule an inspection before burning season.
San Antonio’s humidity accelerates corrosion at the liner’s termination point and at any exposed metal components. The hot, humid summer air condenses inside the cooler flue during off-season months, creating the same acidic condensate that high-efficiency gas appliances produce during operation. The result is accelerated pitting at the top section of the liner and around the cap. We recommend a yearly Level 2 inspection for any DuraFlex liner in San Antonio to catch this corrosion before it becomes a replacement situation.
Most standard DuraFlex chimney cleanings in San Antonio run between $200 and $350, depending on liner length, creosote stage, and whether you need a Level 2 inspection at the same time. Repairs and liner replacement are quoted separately after we complete the video scan. We never surprise you at the door. The written price comes before any work starts. Call (361) 491-3153 for an exact quote on your DuraFlex liner.
Book Your DuraFlex Service in San Antonio, TX
If you own a DuraFlex chimney liner in San Antonio, we’ll clean it, inspect it, and tell you honestly what it needs. Written price first. Photo of the clean-up before we leave. And a full year to make sure it’s right. Call (361) 491-3153 today and talk to a real person, not a voicemail tree.
Written by Danny Cortes, Owner at Kindling Chimney San Antonio, serving San Antonio since 2003.