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.
HeatShield Crown Repair: The San Antonio Owner’s Guide
HeatShield crown repair in San Antonio typically runs $850 to $1,400 installed, depending on crown condition and how much resurfacing the existing concrete needs before the HeatShield membrane goes on. We stock HeatShield CrownCoat and CrownSeal materials on our trucks and can usually complete the job in a single visit. Most owners discover the problem the hard way: a water stain on the ceiling near the fireplace, or a chunk of crown concrete sitting in the yard after a good South Texas storm.
The crown is the concrete slab that caps the top of your chimney. Its whole job is to shed water away from the flue and brickwork. HeatShield makes a repair system specifically for crowns that have started spalling, cracking, or allowing water through. Ruben Castellano has been replacing and resurfacing crowns across San Antonio since well before HeatShield became the go-to spec for this repair, and he’ll tell you plain: a failed crown never gets better on its own, and by the time you see interior damage, the water has been working for months.
Key Takeaways
- Installed HeatShield crown repair in San Antonio averages $850 to $1,400, with a written guarantee on all work.
- HeatShield CrownCoat is a flexible membrane, not a rigid patch, which matters in Texas temperature swings.
- We are an independent installer, not a HeatShield affiliate, and we stock the materials on our trucks.
- You’ll get a written price before we start, and the technician’s name and photo before they arrive.
Styles & brands we work with
Which HeatShield Models This Applies To
HeatShield’s crown repair line is actually two products that work together, and the compatibility question trips up a lot of San Antonio homeowners calling around for price quotes. There’s HeatShield CrownCoat, the gray elastomeric membrane that bonds to the existing crown surface, and HeatShield CrownSeal, the topcoat that locks the membrane in and gives it the finished texture. Both are designed to work as a system on masonry chimney crowns, whether the crown is poured concrete or pre-cast.
Where people get confused is the difference between HeatShield’s flue liner products (Cerfractory, the ones you see on chimney sweep sites everywhere) and the crown system. The crown products are not interchangeable with the flue resurfacing material. If someone tells you they’ll “HeatShield your chimney” for $300, they’re probably not doing a crown repair at all. Ask specifically whether CrownCoat and CrownSeal are going on the crown, and get that in writing. We quote the crown as its own line item, with the two products named separately, every time.
One more gotcha worth knowing: HeatShield requires a minimum surface temperature for proper adhesion, which in San Antonio’s summer means scheduling around the hottest part of the day so the crown’s surface isn’t too hot to bond. We plan Texas summer installations for early morning or late afternoon for exactly this reason.
Signs Your HeatShield Crown Repair Is Failing
If you already have a HeatShield crown in place and you’re wondering whether it’s doing its job, here’s what failure actually looks like on the ground:
- Visible cracking or peeling at the crown edges. The elastomeric membrane should look like one continuous skin. If edges are lifting away from the concrete, water is getting behind the membrane and the bond is breaking down.
- White mineral staining on the brick below the crown. That’s efflorescence, salt deposits left behind when water migrates through the masonry. It means water is getting past the crown, not just sitting on it.
- Pieces of concrete or coating showing up on the roof or in the yard. Texas heat cycling breaks down crown surfaces relentlessly. If you can see aggregate or chunks of the old concrete, the crown has lost its protective layer.
- Water stains on the ceiling or walls near the fireplace after heavy rain. By the time moisture shows up indoors, the crown has been leaking for a while. This is the failure most San Antonio homeowners notice first.
- The flame smells damp or the fireplace has a musty odor after it rains. Water trapped inside the flue cavity or masonry creates that smell, and a compromised crown is the most common entry point we find in San Antonio’s older neighborhoods like Alamo Heights and Terrell Hills.
Replacement Cost & What’s Included
Here’s the number most people want: a full HeatShield crown repair in San Antonio runs $850 to $1,400 installed. The range breaks down like this:
- Basic CrownCoat + CrownSeal application: $850 to $1,050, depending on crown size and accessibility.
- Crown with fill and resurfacing before the HeatShield system: $1,100 to $1,400, when the existing concrete needs significant patching first.
- Flue sealing or minor masonry work at the same time: added as separate line items, priced before any work begins.
Every quote includes the HeatShield materials, surface prep, labor, and a written guarantee on the repair. If that repair fails within the coverage period, the second visit is free. That’s not a promotional line. It’s the 365-Day Done Right Promise, and it’s written into every job we do. You get the price in writing before we start, and nothing gets added at the end. We’ve been serving San Antonio homeowners since 2002, and the pricing model hasn’t changed: tell you what it costs, do what we said, and stand behind it.
See the difference
Before
After
Before
After
Before
AfterDIY or Call Us?
There’s a safe version of “do it yourself” here, and then there’s the version that puts you on a roof with a bucket of coating and ends with a bigger repair bill than you started with. The safe version: you can look at your crown from the ground with binoculars, or from an upstairs window, and check for obvious cracks, peeling, or missing chunks. That’s a smart thing to do after a storm, and you don’t need a ladder for it.
What we don’t recommend is getting up on a San Antonio roof with a store-bought crown sealer and hoping it bonds. HeatShield CrownCoat is a professional product with specific surface prep and temperature requirements. A hardware store bucket of roof patch will last a season or two in Texas heat, then peel and leave the crown worse off than before. Also: roofs and chimneys are genuinely dangerous places to work without proper fall protection and ladder training. We carry safety gear on every truck, and our technicians are trained to set up on steep pitches and two-story San Antonio homes. Call us at (903) 515-5079 for an estimate and we’ll come look at it with a camera, not just a ladder.
FAQs
A properly installed HeatShield crown system lasts 10 to 20 years in San Antonio’s climate, with the wide range reflecting sun exposure, tree cover, and how well the masonry underneath was maintained. We inspect crowns during annual chimney checks and can tell you honestly whether yours needs re-coating or is still doing its job. Call (903) 515-5079 to schedule a look.
Most cracked crowns in San Antonio can be repaired rather than replaced, and that’s exactly what HeatShield CrownCoat is designed for. As long as the concrete underneath is still structurally intact and not crumbled through to the flue, the membrane seals and protects. If the crown has failed badly enough that the concrete has lost its structural integrity, rebuilding is the right call, and we’ll show you the camera footage so you can see it for yourself.
The actual application takes one visit, usually two to four hours including surface prep and cleaning. The membrane needs to cure before full weather exposure, but that happens quickly enough that you don’t need to stay off the roof or avoid the fireplace. We’ll give you the exact timeline when we see the crown.
Yes. Our trucks carry HeatShield CrownCoat and CrownSeal as standard inventory, alongside DuraFlex and Gelco materials for liner work. If we find crown damage during a routine sweep or inspection, we can often do the repair the same day and leave you with a written guarantee and a written invoice before we pull out of the driveway.
Call Alcott Chimney San Antonio for HeatShield Crown Repair
If you’re seeing signs of crown failure, or you just want a straight answer about what’s going on up there, call (903) 515-5079. A live person answers, day or night. We’ll schedule your appointment, send you the technician’s name and photo before the visit, and have them show a photo ID badge at your door. You’ll get a written quote before any work starts, and if we find that your crown can wait, we’ll tell you that too. Ruben’s approach is exactly this: “I would rather give you a straight answer today than a vague promise you have to call us back about tomorrow.”
About Your Technician
Alcott Chimney San Antonio is an independent chimney service company and is not affiliated with HeatShield or its parent company. We install and service HeatShield products because they perform well in Texas conditions. Our team has been repairing San Antonio chimneys since 2002, and every technician who shows up at your door has passed a background check and identity verification before they ever step onto your property. That’s the Threshold Standard, and it’s not an optional upgrade.
Written by Ruben Castellano, Owner, Alcott Chimney San Antonio at Alcott Chimney San Antonio, serving San Antonio and nearby areas.