Masonry repair
Sweep & inspection
Caps & crowns
Flue relining
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.
Fast, Reliable Gas Fireplace Repair Across Leon Valley
Gas fireplace repair in Leon Valley typically runs $160 – $420 for most common fixes, and we can usually get a technician to your door within one to two business days. The real question for Leon Valley homeowners isn’t just price: it’s whether the flue behind that gas log set is actually safe to operate. Most older ranch homes here have clay-tile flues that were never designed for gas exhaust, and the only way to confirm they’re safe is with a camera inspection. Call (903) 515-5079 for a free estimate, and we’ll tell you exactly what we find before recommending any work.
Why Alcott Chimney San Antonio Is Leon Valley’s Preferred Gas Fireplace Repair Company
Ruben Castellano has been running Alcott Chimney Sweep since 2002, and the company works on a lot of Leon Valley homes because the housing stock here has a specific problem: original masonry fireplaces that predate modern gas fireplace standards. When we send a technician to a home off Bandera Road or Huebner Road, the job usually starts with the same question: when was the last time anyone actually looked inside the flue? Most homeowners can’t answer that, which is exactly why we don’t recommend a single repair without first showing you the camera footage.
Our technicians arrive in uniform with a photo ID badge, and you’ll know their name and see their photo before we ever pull into your driveway. Every tech passes a background check and identity verification before stepping onto your property. That’s the Threshold Standard, and it’s not optional. For Leon Valley residents, especially older homeowners and families with young kids, knowing exactly who’s coming to the door is part of the job, not an afterthought.
Styles & brands we work with
Our Gas Fireplace Repair Services in Leon Valley
Level 2 Camera Inspection
The single most important service we offer in Leon Valley is the Level 2 camera inspection. When a gas log set sits in a fireplace built in 1965, the clay-tile flue behind it was sized for wood smoke, not gas exhaust. Gas burns cooler and produces condensation that wood fires never did, and that condensation eats at clay tiles and mortar joints over decades. We send a camera down the flue and show you every crack, gap, and blockage on a live feed before we recommend anything. If the flue is sound, we’ll say so and tell you what maintenance makes sense. If it’s not, you’ll see it with your own eyes.
Gas Flue Relining with DuraFlex or HeatShield
When a camera inspection shows a cracked clay-tile flue or missing mortar joints, the fix is usually a reline. We install DuraFlex liner systems for gas appliances because they’re specifically rated for gas exhaust temperatures and condensation. For flues that are structurally sound but need resurfacing, HeatShield is often the better option. Neither of these is a box-store product; they’re what chimney professionals specify. And we never recommend a reline without camera evidence that you can see first.
Second-Flue Cleaning and Damper Repair
Many Leon Valley homes have two flues: one for the wood-burning fireplace and one for an older gas furnace or water heater. The second flue rarely gets attention because the fireplace “never gets used.” But rusted dampers, animal nesting, and debris still block exhaust in that second stack, and that’s how carbon monoxide backs up into the house. We clean both flues, repair or replace rusted dampers, and show you the before-and-after on camera. If you’re not sure whether your home has a second flue, we’ll check during the inspection.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Leon Valley
We service and install gas fireplace components from the brands professionals actually specify: DuraFlex for gas flue liners, HeatShield for resurfacing existing flues, and Olympia Chimney for caps and termination components. Because we work with these systems every week in Leon Valley homes, we can usually source parts quickly without the weeks-long wait that comes with ordering specialty components through a general contractor.
Common Gas Fireplace Repair Problems We See in Leon Valley Homes
- Cracked clay-tile flues from gas condensation. Homes built from the 1950s through the 1970s in Leon Valley typically have original clay-tile flues. Gas exhaust produces acidic condensation that wood smoke never did, and over 40 to 60 years, that condensation cracks tiles and erodes mortar. A Level 1 visual check from the top won’t catch it. You need a camera.
- Neglected second flues. The gas furnace stack in a dual-flue Leon Valley home often goes years without inspection. Birds, squirrels, and raccoons nest in the unused flue, and rusted dampers stick shut. The result is exhaust that can’t leave the house. We inspect every flue on the property, not just the one behind the glass.
- Spalling smoke chamber debris on gas burners. Leon Valley’s humidity gets into masonry over long idle seasons, and mortar in the smoke chamber flakes off and falls onto the gas burner below. That causes delayed ignition and rollout, which can singe mantels and cabinets. We clean the smoke chamber and repair what’s loose.
- Gas logs burning in wood-only flues. A lot of older Leon Valley homes had gas log sets installed in fireplaces that were originally masonry chimneys for wood burning. Sometimes the flue was never relined for gas. If the clay tiles are intact, great. If they’re not, combustion gases can weep into wall cavities. This is exactly why we push for a camera inspection before any repair quote.
Pricing for Gas Fireplace Repair in Leon Valley, TX
Gas fireplace repair in Leon Valley follows the same range across most of the San Antonio metro, but the age of the housing stock here means a few costs skew higher than newer suburbs. Here’s what we tell homeowners before scheduling:
- Level 2 camera inspection: $175 – $275, including a written condition report with photos.
- Gas log set service and burner cleaning: $160 – $260, depending on access and condition.
- Damper repair or replacement: $140 – $340, with the higher end for top-sealing dampers on older chimneys.
- Gas flue relining with DuraFlex: $2,400 – $4,800, depending on flue height and access. We’ll tell you before any work starts if a reline is actually necessary, and we’ll show you why on camera.
Every job includes a written price before work begins, and every repair carries a written guarantee. If a repair we make fails within the coverage period, the second visit is free. That’s our 365-Day Done Right Promise, and it applies to every gas fireplace repair we complete in Leon Valley.
See the difference
Before
After
Before
After
Before
AfterWhy Leon Valley’s Older Chimneys Need Camera Evidence Before Any Repair Quote
Here’s what we see in Leon Valley that we don’t see in newer neighborhoods: pre-1980s ranch homes with original unlined or clay-tile-lined flues, venting gas appliances into stacks that were designed for wood fire temperatures. The two systems behave very differently. Wood fires push hot, dry exhaust up the flue at high velocity. Gas appliances produce cooler, wetter exhaust that lingers and condenses on the flue walls. Over decades, that condensation cracks clay tiles and erodes mortar joints, sometimes invisibly from the outside of the chimney.
Our tech pulled the damper on a 1968 ranch off Evers Road and found the gas fireplace flue choked with third-degree creosote glaze. The homeowner had been burning gas logs in a wood-only clay-tile flue for years, not knowing the flue was never rated for gas. We scoped it, showed them the camera feed, and installed a DuraFlex liner sized for the gas appliance before relighting. The draft now pulls clean, and the firebox no longer smells of tar on humid mornings. That home’s flue problem wasn’t a guess: it was on the screen in front of the homeowner. That’s how we work in Leon Valley.
Serving Leon Valley, TX - Our Local Coverage Area
We’re based in the Leon Valley area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs – Gas Fireplace Repair in Leon Valley
Because the flue liner is what keeps combustion gases out of wall cavities, and if it was installed in the 1960s or 1970s, it may have been clay tile sized for wood smoke, not gas exhaust. Gas condensation cracks clay tiles over time, and the damage is invisible without a camera inspection. Call (903) 515-5079 and we’ll put a camera down your flue and show you exactly what’s there before recommending anything.
The short answer is you don’t until someone puts a camera in it. The gas furnace flue is the one most Leon Valley homeowners never think about, because the fireplace gets all the attention. Birds nest in unused flues, dampers rust shut, and blockages form. We inspect every flue on your property as part of the Level 2 camera inspection, and we’ll show you the footage from both. Estimates are free.
Yes. Leon Valley’s humidity gets into masonry chimney structures during long idle seasons, especially in spring and fall when the fireplace sits unused. The moisture causes efflorescence and spalling, and in the smoke chamber, it loosens mortar that then drops onto the gas burner below. If your burner is slow to ignite or you hear a small “whump” when it lights, that’s often debris from spalled mortar. We clean it and tell you whether the masonry needs structural repair.
Once a year, even if you only light it occasionally. Infrequent use in a humid climate is what causes many of the problems we find in Leon Valley: rusted dampers, animal nesting, spalled mortar, and delayed ignition. The annual inspection is cheap compared to a liner replacement that catches a chimney fire later. Call (903) 515-5079 to schedule an inspection, which includes the camera footage and a written report.
Yes, but it usually involves more than a cleaning. Third-degree creosote is a hard, tar-like glaze that forms when wood smoke condenses on a cold flue. If a Leon Valley homeowner burned wood for years before switching to gas, that creosote glaze may still coat the flue walls, and gas log sets can’t burn it off the way wood fires do. We remove what’s removable and, if the flue liner is degraded underneath, we recommend a DuraFlex or HeatShield reline to give the gas appliance a clean, properly sized exhaust path. You’ll see the before and after on camera.
We Also Serve Cities Near Leon Valley
If you’re outside Leon Valley proper, our Gas Fireplace Repair team also covers San Antonio, Schertz, Cibolo, and Boerne. Our scheduling is coordinated from our San Antonio office, and crews serve Leon Valley locally. For any gas fireplace repair in Leon Valley, call (903) 515-5079 for a free estimate.
Contact Alcott Chimney San Antonio for Gas Fireplace Repair in Leon Valley
If your gas fireplace isn’t lighting right, smells like tar on humid mornings, or hasn’t been inspected in years, call us at (903) 515-5079 for a free estimate. We’ll send a background-checked, identity-verified technician to your Leon Valley home with a camera, a written price before any work starts, and a guarantee on every repair. You’ll know who’s coming before we arrive, and you’ll see exactly what we find before you spend a dollar.
Written by Ruben Castellano, Owner at Alcott Chimney San Antonio, serving Leon Valley since 2002.