Flue relining
Sweep & inspection
Caps & crowns
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.
HeatShield Flue Liner Replacement: The San Antonio Owner’s Guide
We stock and install HeatShield-compatible flue liner replacement in San Antonio, and most jobs run between $800 and $2,200 installed depending on the liner height and whether the existing HeatShield coating has to be removed first. If your HeatShield liner is cracked, flaking, or you noticed ceramic chips in the firebox after your last sweep, we can usually get a crew out within three to five days and complete the swap in half a day. The way it usually surfaces: you had HeatShield applied a few years back to avoid a full stainless liner, and now the surface is spalling or a Level 2 inspection caught a gap behind the coating where gases are getting through. That’s the moment to stop burning and get eyes on it.
Key takeaways:
- HeatShield is a ceramic-cement relining product, not a structural liner. When it fails, you’re deciding between recoating and a genuine replacement.
- We carry HeatShield replacement materials on the truck and also stock DuraFlex stainless liners if the underlying flue has shifted too far to recoat safely.
- The quote you get over the phone is the same number on the written price we hand you before any work starts. No add-ons at the door.
Which HeatShield Models This Applies To
HeatShield comes in three main product classes: the joint repair system (for sealing mortar joints between clay tiles), the resurfacing system (a full-coverage coating over existing clay), and the CeCure relining system, which uses a ceramic panel sleeve to create a new flue wall inside the old one. In San Antonio, most of the HeatShield we see in older homes is the resurfacing system, applied over clay tile in homes built between the 1960s and mid-1990s, especially around Alamo Heights, Terrell Hills, and the older pockets near Woodlawn Lake where the original terra cotta flues are still in place. If your chimney has a stainless liner that was coated with HeatShield instead of replaced, you’re likely looking at the CeCure panel system, which behaves differently when it fails.
Identifying what you have matters because the fix is not the same across product lines. A flaking HeatShield coating over a structurally sound clay tile flue can sometimes be spot-repaired and recoated. But if the clay tiles behind it have cracked and shifted, recoating over them is putting new material over an unstable base, and that’s where a stainless liner or a full HeatShield CeCure replacement becomes the honest recommendation. We also stock Gelco and DuraFlex parts as alternatives when a coating can’t be saved. One thing to know up front: we’re an independent service provider, not affiliated with HeatShield, which means we can recommend what’s right for your flue instead of defaulting to one product line for every situation.
Styles & brands we work with
Signs Your HeatShield Flue Liner Replacement Is Failing
- Ceramic chips or grit in the firebox after a burn. HeatShield material spalls as it degrades, and those small white or gray flecks under your grate aren’t ash. They’re pieces of the coating breaking away from the flue wall.
- Visible cracks in the coating during a sweep. Our crew spots this with a chimney camera and shows you the footage before we ever quote a repair. Hairline cracking often starts at the mortar joints, where the coating is thinnest.
- Flue gases or smoke smell in the living room even with the damper open. This points to a gap between the HeatShield coating and the existing flue. Gases find the path of least resistance, and that path is sometimes into your drywall.
- Rust or creosote staining on interior masonry near the chimney chase. When the liner stops doing its job, creosote vapor and moisture migrate through the brick. You’ll often see a brownish stain on the wall or ceiling near the fireplace before you smell anything.
- A chimney inspection report that flags “compromised coating” or “liner separation.” If a previous company used those words and you didn’t act, call us. Danny Cortes has walked too many San Antonio homeowners through photos that show the coating peeling like sunburned paint, and the fix is always cheaper when it’s caught early.
Replacement Cost & What’s Included
For HeatShield flue liner replacement in San Antonio, expect these installed price ranges:
- Small single-flue recoat (up to 15 feet, minimal prep): $800 – $1,200
- Full HeatShield resurfacing replacement (standard 20 – 30 foot flue, requires old coating removal): $1,500 – $2,200
- CeCure panel reline with HeatShield replacement (ceramic sleeve system): $1,800 – $2,500
- Stainless DuraFlex liner alternative when coating isn’t viable (installed): $1,900 – $3,000
The spread comes down to three things: flue height, how much old HeatShield material has to be removed before new material goes in, and accessibility on your roof. A steep pitch near the Dominion or a tall two-story chimney in Leon Valley takes longer and costs more than a low-pitch single-story in a ranch-style home around Northside. Every quote includes the old material removal, the new liner, all necessary connectors and caps, and a camera inspection after install so you see the finished flue with your own eyes. The work is backed by the 365-Day Done Right Promise: if something isn’t right, we make it right, no fine print.
See the difference
Before
After
Before
After
Before
AfterDIY or Call Us?
You can safely do two things before calling: check the firebox for chips or grit and run your hand along the visible damper area to see if the coating feels flaky. Both give us useful information over the phone. What you should not do is climb onto your roof, drop a camera down the flue, or attempt any HeatShield patch kit on a partially failed coating, as the repair chemistry is finicky and a missed gap behind the patch creates exactly the condition that causes chimney fires and carbon monoxide intrusion. We’ve seen homeowners in San Antonio spend a Saturday and $200 on a patch kit that failed within a season because the old coating underneath was still moving. If you’re even slightly unsure whether you need a full replacement or a spot repair, call (361) 491-3153 and describe what you’re seeing. We’ll tell you honestly whether it can wait, and the estimate is free either way.
FAQs
In our experience, a properly applied HeatShield replacement lasts 10 to 15 years in San Antonio’s climate, which swings from humid Gulf air in summer to bone-dry winters. The thermal cycling between those extremes is what eventually breaks down any ceramic coating, and our hot, moist summers accelerate that cycle compared to drier markets. Call (361) 491-3153 if your liner is nearing the ten-year mark and you want us to inspect it before the next burn season.
Sometimes, but only if the damage is isolated to one or two mortar joints and the rest of the coating is still well-adhered. We make that call with a camera inspection, not a guess. If the separation covers more than roughly 15 percent of the flue surface, we recommend replacement, because spot repairs over moving substrate fail predictably. We’ll show you the footage either way.
Most single-flue replacements in San Antonio are done in one visit of four to six hours. The coating removal is the longest phase, especially if the original application was thick. We put down shoe covers and drop cloths before bringing anything through the house, and we take a photo of the clean-up before we leave, per the Cedarwell Care Promise.
Yes. We carry HeatShield resurfacing and CeCure replacement components as standard truck stock, along with DuraFlex and Gelco liners when the situation calls for a different approach. That means we don’t quote a job, order parts, and leave you waiting. If we’ve scoped it, we’ve got what we need to finish it.
Get an Honest HeatShield Liner Assessment in San Antonio
A clean flue is the quietest safety feature in your home, so let’s make sure yours is doing its job. Danny Cortes and our crew have served San Antonio families for years, from Alamo Heights ranch-style homes to older properties near the Pearl, and we’ll never recommend a liner replacement without camera evidence you can see for yourself. If your HeatShield is flaking, cracked, or showing gaps, call (361) 491-3153 for a free estimate and a straight answer. Written price before any work starts, every time.
Written by Danny Cortes, Owner, Kindling Chimney San Antonio at Kindling Chimney San Antonio, serving San Antonio and nearby areas.