Chimney Repair in San Marcos — Camera Evidence Before Any Quote

Trusted Chimney Repair for San Marcos Homeowners

Chimney repair in San Marcos typically costs $350 to $2,800 depending on whether you’re dealing with a cracked crown, corroded flashing, or a damaged flue liner, and most repairs are completed in a single visit. Oakgrove Chimney Sweep handles the full scope of chimney work, from the masonry at the roofline down to the liner inside the flue, so a problem found during your annual sweeping doesn’t get handed off to a third party. We repair what we find, and we’ve been doing it long enough to know that San Marcos humidity and Hill Country freeze-thaw cycles create predictable failure points in chimneys across Hays County. If you’ve noticed water staining near your fireplace, crumbling mortar on the crown, or a cap that’s rusted through, call (866) 472-2513 and we’ll tell you honestly whether it’s urgent or can wait.

Call (866) 472-2513

Chimney Cap Installation

Chimney Cap Installation in San Marcos is the single most cost-effective step you can take to prevent water damage, animal entry, and downdrafts, and it typically runs $180 to $450 including the cap and labor. A properly sized cap with a screened sides keeps rain from saturating your flue tiles while still allowing proper draft, which is critical for both wood-burning fireplaces and gas inserts. We stock Gelco caps in standard and custom sizes because their stainless and copper models hold up better to Texas sun than the powder-coated hardware-store versions that fade and rust within a few seasons. If your chimney currently has no cap, or the existing cap was installed by a previous owner who guessed at the size, this is where we start.

Why Flue Size Matters

An undersized cap restricts draft and pushes smoke back into the living space. An oversized cap lets rain drive in sideways during Hill Country thunderstorms, which is exactly what we see in older neighborhoods around the San Marcos River where original caps were never sized correctly.

Materials That Last in Texas Heat

We install stainless steel and copper caps exclusively. Galvanized steel, which is what most big-box stores sell, starts pitting within two to three years under central Texas UV exposure. A Gelco stainless cap will outlast the chimney it’s mounted on.

Chimney Cap Replacement

Chimney Cap Replacement is what you need when the existing cap is rusted, bent from a storm, or missing its screening, and in San Marcos that job usually costs $220 to $500 depending on flue dimensions and material. We often find caps that were installed with the wrong mounting hardware, or caps where the screen has torn and birds have nested inside the flue. Rather than patching a cap that’s already compromised, our standard practice is to replace it with a correctly sized Gelco unit and remount it so the screen is properly tensioned. That said, if your cap is structurally sound but just loose, we’ll tell you that too. We don’t sell replacements you don’t need.

Storm Damage Assessment

Hail and high winds take a real toll on chimney caps in Hays County. After a major storm, a bent cap can restrict airflow or come loose entirely, which is why a quick inspection after hail season is worth scheduling. We check mounting, screen integrity, and whether the cap is still seated square on the flue.

Upgrading From None to Pro

If you’re replacing a cap that was never properly installed in the first place, we take measurements at the flue opening and order a cap that fits. A cap that’s too tight chokes the fire. A cap that’s too loose rattles in the wind and lets rain attack the flue tiles from above.

Chimney Liner Installation

Chimney Liner Installation in San Marcos typically runs $1,800 to $4,500 for a typical single-story masonry chimney, and it’s the repair we recommend most often after a camera inspection reveals cracked flue tiles or a liner that’s missing mortar joints. Oakgrove Chimney Sweep installs DuraFlex flexible liner systems, which is the industry standard for relining damaged or undersized flues because it’s code-compliant, UL-listed, and sized to the appliance that’s actually venting through it. You need a new liner when the existing clay tiles have separated, when you’re switching from wood to gas and the old flue is oversized for the new insert, or when a previous liner has rusted through. This is not a patch job. A damaged liner is a combustion safety issue.

DuraFlex vs. Generic Liners

We use DuraFlex because it’s the same product professional chimney contractors across the country specify. The aluminum alloy resists the acidic condensate that gas appliances produce, and the single-piece construction eliminates the seams where cheap liners leak. When we install it, we’re solving the problem once.

When a Resurfacing Works Better

Not every liner problem requires a full replacement. If the existing flue is structurally intact but has hairline cracks or missing mortar joints, HeatShield chimney liner resurfacing can restore the flue at a lower cost than a full reline, and it’s a repair most general contractors can’t perform because it requires certification.

Chimney Flashing Repair

Chimney Flashing Repair addresses the metal barrier where the chimney meets the roofline, and in San Marcos this repair usually costs $400 to $1,200 depending on how much flashing needs to be replaced and whether the roof decking underneath has rotted. Flashing is one of the first things we check because it fails quietly: the caulk dries out, the metal lifts, and water runs down the outside of the chimney into the attic where you can’t see the damage until the ceiling stains. We use Copperfield flashing components when replacement is needed because the copper and lead-coated copper hold up against decades of Hill Country rain, unlike the thin aluminum flashing that roofers sometimes install as a shortcut. Improper flashing is the number one source of chimney leaks we see in San Marcos, and it’s almost always fixable without touching the rest of the chimney.

Leak Diagnosis Without the Guesswork

Before we touch a single piece of flashing, we identify where the water is actually coming from. That means checking the crown, the masonry, and the roofline junction, not just re-caulking and hoping. The most common culprit is step flashing that was never cut into the mortar joints properly, which lets water run sideways into the wall cavity.

Copper vs. Aluminum Flashing

Aluminum flashing fails at the bend points under repeated thermal cycling, especially on the south-facing side of San Marcos chimneys where the sun hits hardest. Copper costs more up front, but it doesn’t crack, doesn’t corrode, and we don’t have to come back in five years to redo it.

Chimney Crown Repair

Chimney Crown Repair fixes the masonry cap that sits on top of the chimney and shields the entire structure from water, and in San Marcos this job typically costs $600 to $1,500 depending on the crown’s size and whether we’re resurfacing or rebuilding it. The crown is the chimney’s umbrella: when it cracks, water runs down into the brickwork, freeze-thaw cycles widen the cracks every winter, and the masonry starts spalling from the inside. Most crowns in Hays County were poured with the same mortar as the brick joints, which is a mistake because mortar is too porous for horizontal surfaces and cracks within a few years. We rebuild crowns using a Portland-based mix with proper overhang and drip edges, which is the only detail that keeps water from running down the brick face.

Cracked vs. Failed Crowns

A hairline crack can sometimes be sealed and monitored for another season or two. A crown that’s eroded to the point where the mortar is crumbling in your hand needs a full tear-out and repour. We photograph everything and show you what we’re seeing before we recommend the scope.

Proper Overhang Prevents Future Damage

Most San Marcos crowns we see were poured flush with the chimney edges, which directs water straight down the masonry. We build crowns that extend past the chimney face with a drip edge, so water falls to the roofline instead of soaking into the brick.

Chimney Repair Companies

Chimney Repair Companies in San Marcos vary widely in capability, and the difference between a sweep-only outfit and a full-service shop like Oakgrove Chimney Sweep is whether they can actually fix what they find during your annual cleaning. Many companies will clean your chimney, flag a cracked flue tile or a rusted cap, and then refer you somewhere else to get it repaired. We don’t work that way. Our crew handles the sweep, the inspection, the repair, and the documentation in one service relationship, so there’s no dispute about what was recommended, who’s responsible, or what the report actually said. When you’re comparing companies, ask directly whether they perform masonry repair, liner installation, and crown work in-house, because that’s the distinction that matters when a real problem shows up.

Full-Service Means We Finish the Job

We repair what we find, which means the photo we show you during your inspection is the same repair we quote and the same repair we complete. There’s no second company, no second dispatch fee, and no gap between diagnosis and fix where water keeps coming in.

Questions to Ask Before You Book

Ask whether the company owns its camera equipment or rents it, whether they’re certified to apply HeatShield, and whether they file their own reports with your insurance if a claim is involved. The answers tell you whether you’re hiring a specialist or a middleman.

Chimney Masonry Repair

Chimney Masonry Repair in San Marcos covers everything from tuckpointing deteriorated mortar joints to rebuilding a spalled brick chimney face, and depending on the scope, the work typically runs $500 to $3,500. Masonry fails from the top down: water penetrates the crown, soaks the brick, and the freeze-thaw cycle in winter pushes the brick faces apart from inside. By the time you see bricks flaking, pieces falling into the yard, or mortar joints washing out, the damage is already structural. Our masonry work includes proper joint prep, matching mortar to the original mix so you don’t get the hard-mortar-on-soft-brick problem that crushes old brick, and we use Olympia Chimney restoration products for repointing because they’re formulated for old masonry, not new construction.

Repointing Done Right

Repointing isn’t just pressing mortar into empty joints. The joint has to be raked to the right depth, cleaned of dust, and filled with a mortar that’s slightly softer than the surrounding brick so the wall can flex through temperature cycles. We see poorly done repointing all over San Marcos where the mortar is harder than the brick and the brick starts spalling at the joint line.

Partial Rebuilds vs. Full Tear-Downs

Sometimes only the top three or four courses of brick need replacement, and the rest of the structure is sound. Other times the chimney is compromised from the crown down to the roofline and a partial rebuild is a waste of money. Our camera and masonry assessments show you exactly what needs to come out and what can stay.

Brands We Service

We work with professional trade brands because they’re what serious chimney contractors use, and they’re what San Marcos homeowners end up with after a repair that wasn’t done right the first time. DuraFlex is our go-to for chimney liner installation. It’s the same UL-listed flexible liner system that fireplace manufacturers and code inspectors recognize, and we stock it in multiple diameters so we can size the liner to the appliance instead of forcing an off-the-shelf fit.

Gelco manufactures the caps and covers we install most often because their stainless and copper models hold up in central Texas weather, and their custom fabrication means we can order for odd flue sizes instead of adapting a big-box cap with sheet metal screws. HeatShield is a product we’re certified to apply, and it’s the repair our customers often haven’t heard of: a professional resurfacing system that restores a cracked clay flue without a full reline. Whether you have a DuraFlex liner installed by a previous contractor, a Gelco cap that’s seen better days, or a masonry flue that needs HeatShield restoration, we can service it. Your flue is a combustion system, and we treat it that way.

Signs You Need a Pro Right Now

• Water staining on the ceiling or wall near the fireplace. This means water is getting past the flashing, the crown, or the masonry itself and running into the house. By the time staining appears, the leak has usually been active for weeks. The longer it runs, the more the repair expands into drywall, insulation, and framing.
• Crumbling mortar or brick pieces in the yard or on the roof. Spalling brick means water has penetrated the masonry and freeze-thaw cycles are breaking the brick apart from inside. This is structural, not cosmetic, and it gets worse every winter. The damaged area usually needs to be rebuilt before the chimney becomes unstable.
• A cap that’s rusted, bent, or missing entirely. Without a functional cap, rain runs directly into the flue and sits at the smoke shelf where it accelerates liner deterioration. Birds and squirrels will also use the open flue as an entry point, and nests inside a flue are a fire hazard and a carbon monoxide risk.
• Smoke entering the room instead of drafting up the chimney. Better to address this now than wait for the first cold snap when fires become regular. Poor draft can indicate a cracked liner, an undersized or blocked flue, or a cap that’s restricting airflow. Carbon monoxide is the silent risk here, and it’s not one to diagnose by feel.
• Visible cracks in the crown with plants or moss growing in them. Organic growth means water is pooling and holding in the crown cracks. Roots will widen those cracks every season, and the crown will fail completely within a few years if left alone. Crown repair is cheaper than the masonry damage that follows crown failure.

Our Process, Step by Step

1. 1
   Camera inspection of the full flue. We run a high-resolution camera from the firebox to the cap so we can see exactly what’s happening inside the flue, not just what’s visible from the roof or the hearth. You see the footage. We point out cracks, gaps, moisture staining, and animal debris as we go.
2. 2
   Physical assessment of the exterior. This includes the crown, the flashing, the masonry joints, the cap, and the clearance to the roofline. We’re looking for water entry points and structural issues, and we document everything with photos so you have a record whether or not you proceed with a repair today.
3. 3
   Repair recommendation with honest triage. We tell you what needs to be fixed now, what should be budgeted for next season, and what’s cosmetic enough to leave alone. If the flue is safe and the chimney just needs a sweep, that’s what we say. If the liner has failed, we show you the footage and explain why we’re recommending a DuraFlex reline or HeatShield resurfacing.
4. 4
   Repair work using professional-grade materials. Every repair we perform uses the same products we’d want on our own homes: Gelco caps, Copperfield flashing, Olympia masonry products, and DuraFlex liners. No hardware-store substitutes, no shortcuts on joint prep, and no work performed that you haven’t already approved.
5. 5
   Post-repair documentation and a report. You get a written record of what was found, what was repaired, and what remains recommended for the future. If you file an insurance claim for storm damage, the documentation is yours to submit. We don’t leave a job without making sure you understand what was done and why.

How Much Does Chimney Repair Cost in San Marcos?

Our Service Area Near San Marcos

Oakgrove Chimney Sweep serves San Marcos and the surrounding Hill Country communities, including Chimney Repair in Kyle, Chimney Repair in Uhland, Wimberley, Woodcreek, Buda, Lockhart, Manchaca, Onion Creek, Shady Hollow, Dripping Springs, and Barton Creek. Most repair appointments in San Marcos proper are scheduled within the same week, and we group calls by geography so we’re not burning windshield time between jobs. If you’re outside the immediate area, call and ask. If we can get to you, we’ll tell you when.

Frequently Asked Questions About Chimney Repair in San Marcos

Schedule Your Chimney Repair Service in San Marcos Today

If you’ve got water coming in, a cap that’s failed, or a flue that hasn’t been inspected in years, we’ll send someone who can tell you exactly what’s wrong and fix it in-house. Call (866) 472-2513 for a free estimate with camera documentation. One call, one crew, full-service documentation.

Written by Glen Whitaker, Owner at Oakgrove Chimney Sweep, serving San Marcos and the surrounding Hill Country.