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 Dallas Owner’s Guide
HeatShield flue liner replacement in Dallas typically runs $2,400 to $6,500 installed, depending on flue size, access difficulty, and whether we’re resurfacing the existing liner with HeatShield’s Cerfractory material or installing a new stainless liner system. We stock HeatShield-compatible resurfacing materials on our trucks and can usually complete the job in a single visit once we’ve scoped the flue with a camera. Most Dallas homeowners discover their HeatShield liner has failed during a routine sweep or after noticing flaky ceramic material falling into the firebox, a smell of smoke in the house, or visible gaps in the chimney tile from the roofline.
If you’re seeing any of that, don’t panic. A failed HeatShield liner isn’t an automatic full rebuild. We’ll camera the flue, show you exactly what we’re seeing, and give you a written price before anyone touches a tool. That’s how Ruben Castellano has run Alcott Chimney Dallas since day one: tell you what’s there, tell you what it costs, do the work. That’s the whole job.
Which HeatShield Models This Applies To
HeatShield isn’t a liner you buy off a shelf. It’s a proprietary Cerfractory sealant system applied as a resurfacing coat inside an existing flue, usually over clay tile. The system comes in two application forms: HeatShield 40 for minor spalling and cracked mortar joints, and HeatShield 80 for more substantial voids, open gaps between tiles, or missing mortar. HeatShield 80 uses a foam applicator to restore the flue’s shape where sections have failed.
The compatibility question for Dallas homeowners usually sounds like this: “My home was built in the 80s with a clay tile flue. Someone applied HeatShield 15 years ago. Can you re-treat it?” The answer depends on how much of the original ceramic coating remains bonded. If the base clay tile is intact and the HeatShield layer is delaminating in patches, a re-application of HeatShield 80 often works. If the flue has shifted, cracked, or the original tile is crumbling, a stainless liner replacement (we install DuraFlex and Gelco systems alongside HeatShield) becomes the structurally correct fix. We’re an independent Dallas chimney service, not a HeatShield corporate installer, which means we’ll tell you plainly when HeatShield re-application is the right call and when it’s throwing money at a flue that needs surgical replacement instead.
One compatibility gotcha worth knowing: HeatShield 80 application requires a flue with a minimum interior dimension of roughly 6″ x 6″ for the foam applicator to pass cleanly. Smaller flues, common in some 1960s-era Dallas ranch homes in neighborhoods like Casa View or Lake Highlands, often can’t accept the applicator and need a different liner solution. We’ll measure before quoting, not after.
Styles & brands we work with
Signs Your HeatShield Flue Liner Replacement Is Failing
- Flaky gray or tan material in the firebox or smoke shelf. This is the Cerfractory coating spalling off the flue wall. In Dallas, the freeze-thaw cycles we get in January and February accelerate this once moisture has found its way into the flue.
- A smoke smell inside the house when the fireplace is running. Gaps in the liner let smoke and combustion gases escape into the chimney cavity instead of venting up and out. This one is worth taking seriously: it means the liner is no longer doing its only job.
- White efflorescence staining on the exterior chimney brick. Water is getting into the flue, reacting with the masonry, and leaving mineral deposits behind. A compromised HeatShield coat is rarely the sole cause, but it’s often part of the picture.
- Visible cracks or gaps in the clay flue tile from a rooftop inspection. HeatShield was likely applied to seal exactly this kind of damage. If you can see fresh cracks, the original problem has returned and the resurfacing layer has failed in those spots.
- Drafting problems that have gotten gradually worse. A failing liner creates rough interior surfaces and obstructions that slow the draft. If you find yourself opening a window to keep the smoke moving up rather than into the room, the flue’s interior condition is suspect.
Replacement Cost & What’s Included
Here’s what you’re actually paying for when we quote a HeatShield flue liner replacement in Dallas:
- Camera inspection and cleaning prep: $150 to $350. We won’t apply HeatShield over creosote or debris. The flue gets swept first, every time.
- HeatShield 40 re-application (minor cracks and spalling): $2,400 to $3,800 for a typical 20′ to 30′ flue.
- HeatShield 80 full resurfacing (substantial gaps or missing tile sections): $3,500 to $6,500 depending on flue height, accessibility, and how many applicator passes are required.
- Full stainless liner replacement (when HeatShield can’t resolve the problem): $3,800 to $7,500, using DuraFlex or Gelco liner systems.
Every quote includes the sweep, the camera video so you can verify the condition with your own eyes, the HeatShield materials, the labor, and a written guarantee on the repair. If the liner fails within the coverage period, the second visit is free. We hand you the written price before work starts, and that’s the number on the invoice when we’re done. No surprises.
See the difference
Before
After
Before
After
Before
AfterDIY or Call Us?
HeatShield application is genuinely not a DIY product. The Cerfractory material has a limited working time once mixed, requires a specialized foam applicator and pump setup, and the flue must be properly prepped with a full mechanical sweep before application. If the coating doesn’t bond correctly, you’ve made the problem worse and created flue debris that now needs to be removed. This isn’t a $40 tube of refractory cement from a hardware store. It’s an engineered system that fails safely when applied correctly and fails dangerously when applied wrong.
What you can safely do as an owner: shine a flashlight up from the firebox and look for obvious flaking or gaps you can photograph. Keep a log if you notice smoke odor when the fireplace runs. That information helps us quote faster. For the actual repair, call (361) 264-4483 and we’ll get you on the schedule. Ruben and the Alcott Chimney Dallas crew have been fixing flues in this city long enough to know which Dallas homes have the flue designs that fight back.
FAQs
In our experience across Dallas, a properly applied HeatShield 80 resurfacing typically lasts 15 to 25 years before needing attention, though extreme weather exposure and heavy fireplace use during our short but real winter months can shorten that. The biggest variable is moisture: chimneys without a proper cap and crown seal in Dallas’s spring storm season degrade faster. Call (361) 264-4483 and we can camera the flue and give you a straight answer on what kind of lifespan your specific chimney is looking at.
Yes, in many cases a failing HeatShield liner can be re-treated with a targeted HeatShield 80 application rather than a full re-surfacing, especially when the failure is isolated to one section of the flue. The honest answer depends on how much of the original coating has delaminated and the structural condition of the clay tile underneath. If the underlying masonry is shifting or crumbling, repair becomes a patch job that won’t hold. We’ll show you the camera footage and tell you if repair or replacement is the smarter money.
Most HeatShield applications in Dallas are completed in a single day, with 4 to 8 hours of on-site work depending on flue height and the number of application passes needed. The job includes prep sweeping, application, and a curing period before the fireplace should be used again. We’ll give you an exact timeline with your written quote so you know when you can light the first fire afterward.
We keep HeatShield 40 and HeatShield 80 materials, applicator equipment, and related components on our trucks and in our Dallas shop, so there’s no multi-week wait for parts to ship. Ruben made stocking professional trade materials a priority when he built Alcott Chimney Dallas because ordering parts from a distributor after the customer has already waited two weeks for an appointment is a waste of everyone’s time. When you call (361) 264-4483, we can typically schedule the job within days, not months.
Ready to Fix That Flue?
If your HeatShield liner is showing signs of failure, or if you just want a professional camera inspection to know exactly what you’re dealing with, call Alcott Chimney Dallas at (361) 264-4483. A live person answers, day or night. We’ll schedule your inspection, send you the technician’s name and photo before we arrive, and hand you a written price before any work begins. You’ll know exactly what’s there, exactly what it costs, and exactly what we’ll do about it.
Written by Ruben Castellano, Owner, Alcott Chimney Dallas at Alcott Chimney Dallas, serving Dallas and nearby areas.