Metal roofing
Architectural shingles
Tile roofing
GAF
Owens Corning
Flat & low-slopeFree roof inspection with deck photos before we talk money - GAF and Owens Corning certified installation
Trusted Roof Repair for San Antonio Homeowners
Roof repair in San Antonio isn’t a someday project. The heat, the sudden downpours, the hail that can show up in March and disappear by April – they all work against your roof year-round. Most homeowners wait until they see a stain on the ceiling, and by then the decking underneath has been soaking for weeks. That’s where we come in. Mercer Roofing Co San Antonio has been fixing roofs across the Alamo City since 2000, and we’re part of the Threshold Group family of home-service companies. Every repair starts with a written price before any work begins, and every job carries our 365-Day Done Right Promise in writing. When you call (254) 276-4369, a live person answers – 24/7, not a voicemail. If you’re wondering whether that small leak matters, it does. Let’s talk about what roof repair actually costs and what it looks like in San Antonio.
Roof Leak Repair
Leak Repair is the most common call we take in San Antonio, and it’s almost always traced back to one of four things: failed flashing around chimneys or vents, worn-out pipe boots, cracked shingles from hail, or clogged valleys that hold water against the roof deck. San Antonio’s clay-heavy soil and hard rainfalls mean gutters overflow fast, and when water backs up under the shingle edge, it finds the nail holes and works its way inside. We trace the leak to its source, not just the stain on your ceiling – water travels horizontally along rafters, so the drip you see is rarely where the hole is. Roof leak repair in San Antonio typically runs $250 to $650 for isolated flashing or shingle work, and closer to $900 to $1,500 if the decking underneath has rotted and needs a section replaced. Grant Whitlock, who leads our San Antonio team, will tell you the same thing he tells every homeowner: the water stain you ignore today is the mold and drywall repair you pay for in six months.
Flashing and Pipe Boot Failures
The metal around your chimney and the rubber boots around plumbing vents shrink, crack, and pull away over time. San Antonio’s temperature swings – 100°F summers to freezing winter mornings – expand and contract that material until it splits. We replace failing flashing with new metal and swap cracked pipe boots for UV-stable replacements, sealed and checked before we come down off the ladder.
Valley and Dormer Leaks
Valleys carry more water than any other part of the roof, so a single lifted shingle there gets punished in every storm. Dormer walls are bad too because the siding, roof, and window all meet in one place. We inspect the valley metal and the exact line where dormer flashing meets shingles – that’s typically where the real entry point is, not where the water shows up inside.
Styles & brands we work with
Emergency Roof Repair
Emergency Roof Repair is for the days when the roof is actively letting water into your house – after a tree limb comes down, a storm tears shingles off, or a leak opens up over your bed at 2 a.m. We answer the phone with a live person 24/7 because a tarp at midnight keeps the problem from becoming a $10,000 drywall and flooring replacement by morning. Emergency roof repair in San Antonio usually runs $350 to $800 for a tarp and temporary seal, with the permanent fix quoted separately and in writing before we start. We don’t charge for the estimate, and we don’t mark up the tarp on a rainy night just because we can. Grant and the Mercer team work across the city in the weather we’re dealt – our technicians are background-checked, identity-verified, and they arrive in a marked uniform with a photo ID badge you can check before you open the door.
Storm and Wind Damage Response
When the wind rips shingles loose or hail punches holes, we prioritize active leaks over cosmetic damage. Every storm repair starts with a written scope and price – you’ll know exactly what we’re fixing and what it costs before a single nail goes in. No surprises on the invoice, ever.
Overnight Tarp and Temporary Sealing
If your roof can’t be safely repaired in the dark or in heavy rain, we secure it with a proper tarp and schedule the permanent fix at first light. The tarp buys you days, not weeks, and we tell you up front that it’s temporary – some roofers let tarps ride for a month and call it done. We don’t.
Flat Roof Repair
Flat Roof Patch work in San Antonio is a different animal from shingle work, and most residential crews don’t understand that. Flat roofs – common on mid-century homes in Alamo Heights, Terrell Hills, and parts of Castle Hills – rely on membranes like TPO, modified bitumen, or EPDM that can blister in the Texas sun and split at the seams. Flat roof repair here typically runs $400 to $900 for a seam repair or small membrane patch, and $1,200 to $2,500 if the insulation underneath is waterlogged and needs to be cut out and replaced. Ponding water is the big one: San Antonio’s clay soils shift, so flat roofs that drained fine a decade ago now hold a pool after every rain. That standing water degrades the membrane and finds every pinhole. We mark the low spots, check the drains, and fix the membrane so water moves off instead of sitting on it.
Membrane Patching and Seam Repair
TPO and modified bitumen seams fail from UV exposure and temperature cycling – San Antonio’s roof surface can hit 160°F in July and drop 100 degrees by January. We clean and prime the area, then weld or seal the patch so it flexes with the roof. A proper flat roof repair is not caulk in a joint – it’s a bonded membrane patch rated for the same lifespan as the roof itself.
Ponding Water and Drainage Fixes
We inspect the drains and scuppers first because 80% of flat roof ponding in San Antonio is a drainage problem, not a membrane problem. We clear debris, adjust the low points, and when needed add a tapered layer so water flows to the drain. Repairing the membrane without fixing the ponding means you’ll be calling us again after the next storm.
Shingle Roof Repair
Shingle Replacement covers everything from a few wind-lifted tabs to a full section of hail-damaged shingles. San Antonio sees hail regularly – not the softball-size stuff that makes the news, but the inch-and-under pea hail that weakens shingle granules until they slough off into your gutters. That granule loss is the quiet killer: once the asphalt layer is exposed, the shingle cooks in the sun and cracks. Shingle roof repair in San Antonio typically runs $350 to $800 for a small area, and $1,100 to $2,200 when we’re replacing an entire slope or section. We work with manufacturer-recognized shingle brands – GAF, CertainTeed, and Owens Corning are the ones we install most often here – and we match the color and profile as closely as possible even when the original shingle is discontinued.
Granule Loss and Hairline Cracking
If you see granules collecting in your gutters, that’s not normal – it’s UV and hail exposure wearing the shingle down. Once the granule layer is gone, hairline cracks follow within a season or two. We replace those shingles before water finds the crack and starts working on the underlayment.
Wind-Lifted Tabs and Exposed Nails
South Texas thunderstorms push shingle tabs up and snap the sealant strip, leaving the nails exposed to water. An exposed nail head is a slow leak waiting for the next rain. We reseal lifted tabs when the shingle is intact and replace shingles when the sealant strip is dead – a repair that takes an hour but saves a decking replacement later.
Storm Damage Roof Repair
Storm Damage Roof Repair in San Antonio is specialized because we’re often working a claim, not just a leak. Hail and wind damage here is real and regular – particularly in the corridor from Boerne down through Bulverde and across to Windcrest. Most policies cover storm damage, but the claim process matters. We document everything: photos, measurements, test squares for hail count, and the exact date and severity of the storm. Storm damage repair in San Antonio typically runs $500 to $1,500 for spot repairs after a claim is approved, and full slope replacement based on your policy and deductible. We don’t chase storms – we’re a San Antonio roofing company that’s been here since 2000 – but we do know how to present a claim so the insurance adjuster sees what we see. Grant and the team can meet your adjuster on the roof and walk the damage together.
Hail Damage Claims and Adjuster Coordination
We walk the roof with your adjuster, point out the hail spatter, granule loss, and soft spots in the shingle mat, and provide our own photo documentation. Getting an approved claim the first time is mostly paperwork done right. We handle that paperwork so you’re not stuck on the phone for three hours with a call center.
Wind Uplift and Missing Shingle Replacement
High winds don’t always tear whole shingles off – sometimes they break the seal and leave the shingle flapping. A flapping shingle is worse than a missing one because it lifts the surrounding shingles in every gust. We replace the dead shingles and reseal the borderline ones, then give you a written recommendation on what’s urgent and what can wait.
Metal Roof Repair
Metal Roof Repair in San Antonio covers standing seam panels, exposed-fastener metal roofs, and the occasional metal shingle system. Metal roofs do well in Texas heat, but the screws and gaskets wear out long before the panels do. We see it all the time on homes in Floresville and out toward Kirby – a roof that’s 15 years old with panels in great shape but gaskets that have gone brittle and let water wick around the fasteners. Metal roof repair typically runs $400 to $1,000 for fastener replacement and resealing on a standard residential roof, and $1,200 to $2,800 for panel replacement after impact damage or corrosion at the laps. We also fix the details most roofers skip: the ridge cap, the transition flashing at the eaves, and the penetrations around vents and skylights where leaks actually start.
Fastener and Gasket Replacement
Exposed fasteners with dead gaskets are the number one leak source on metal roofs, and they fail in San Antonio’s heat faster than anywhere else in the state. We replace the fasteners with new ones, using an oversized screw with a fresh EPDM gasket when the hole has wallowed out. On a 2,000 square foot roof, that’s often a few hundred screws – labor-intensive, but it extends the roof’s life by a decade.
Panel Replacement and Seam Repairs
When a panel is dented by hail or corroded at the overlap, the right repair is replacing that panel, not smearing sealant on it. We match the panel profile and color, remove the damaged section, and install the new panel with proper butyl tape at the laps. The seam is the weak point on any metal roof – we treat it that way.
Commercial Roof Repair
Commercial Roof Repair in San Antonio is a different job than residential repair because the stakes are different: a leak over a tenant’s desk is a lost day of business, and a roof failure over inventory can be a six-figure loss. We handle flat commercial roofs – TPO, EPDM, modified bitumen, and metal – on offices, retail strip centers, and warehouses across the city, including in the Lackland AFB area. Commercial roof repair in San Antonio typically runs $800 to $2,500 for a targeted membrane repair, and $3,000 to $8,000 for larger sections that require cutting out wet insulation and rebuilding the roof assembly. Every commercial job gets a written scope, a line-item price, and a guarantee we’ll put in writing – our 365-Day Done Right Promise applies to commercial work too.
Flat Commercial Roof Restoration
For buildings with a sound roof deck but an aging membrane, a targeted repair can buy years of service without the cost of a full replacement. We identify the wet insulation with a moisture scan, cut it out, replace it, and weld or seal a new membrane patch over the area. The repair is clean, documented, and priced before we mobilize.
Tenant and Facility Coordination
We schedule around your tenants’ business hours when we can, and we protect the areas below the repair while we work. If the repair is over a retail floor or office space, we lay down drop cloths and respect the disruption. We’re background-checked, photo-badged, and uniformed on every visit – the Threshold Standard applies to every Mercer technician, on every job, commercial or residential.
Brands We Service
We install and repair shingle roofs from the manufacturers San Antonio homeowners and insurance companies actually trust: GAF, CertainTeed, and Owens Corning are the brands we work with most often. With GAF, we’re familiar with their Timberline and Royal Sovereign lines – so we can match a patch on an existing roof without it looking like a band-aid. CertainTeed’s Landmark shingles are common across San Antonio, and we stock the most frequent colorways so a repair doesn’t wait on a special order. Owens Corning’s Duration and Oakridge lines show up on a lot of homes built in the 2000s here, and we know how their sealant strips age in South Texas heat.
Beyond those three, we also repair roofs with Boral and other manufacturer-recognized brands when they’re already on the home. The point isn’t the brand name – it’s that we use materials that carry a manufacturer’s backing and we stand behind the installation with our own written guarantee. Whether you have GAF, CertainTeed, Owens Corning, or any other make, we can help.
See the difference
Before
After
Before
After
Before
AfterSigns You Need a Pro Right Now
- Water stains on the ceiling or walls. A stain means water has already saturated the drywall and is pooling on the other side. By the time you see it, the leak has been active for at least a few days. That water is working on your insulation and framing while you read this.
- Granules in the gutters or at the downspout. Asphalt shingles shed granules when their protective layer is worn down by hail, heat, or age. You’ll see a fine grit collect in the gutter – that’s the shingle roof breaking down. Once enough granules are gone, the shingle fails fast.
- Curling, cracking, or lifting shingles. Shingles that don’t lie flat let wind get underneath and water find the nail line. If you can see shingles cupping or the corners lifting from the curb, the roof is shedding water less effectively with each passing storm.
- Daylight through the roof boards in the attic. Go into the attic on a bright day with the lights off. If you can see sunlight through the roof decking, water can follow that same path. It’s one of the fastest ways to confirm your roof has gaps that need attention – no special tools required.
- Sagging areas or a spongy feel when you walk the roof. A section that gives underfoot means the decking beneath the shingles has lost its strength, usually from water damage. Don’t walk on it again – weakened decking can fail under a person’s weight. Call us instead; we’ll inspect it with proper safety equipment.
Our Process, Step by Step
- 1
Call and talk to a live person. When you call (254) 276-4369, a human answers – 24/7, not an answering service, not a callback form. We ask about the problem, your address, and when you’re available, then we schedule a time that works for you.
- 2
Meet your technician at the door. Before the visit, we send you the name and photo of the technician who’s coming. When they arrive, they’ll be in a clean Mercer uniform with a photo ID badge you can verify at the door. You know exactly who’s entering your home before you open it.
- 3
We inspect the roof and show you what we find. Grant or one of our techs gets on the roof and checks the shingles, flashing, valleys, penetrations, and attic ventilation. We take photos of the problem areas and walk you through them in plain English – flashing is the metal that seals roof edges, decking is the wood under the shingles. You’ll see exactly what we see.
- 4
You get a written price before we start. We put the scope and price in writing first. No work starts until you approve it, and the price doesn’t change once we’re on the job – no surprise change orders, no “we found something else” markup at the end. The price on the estimate is the price on the invoice.
- 5
We fix it right and guarantee it in writing. The repair is done, the area is cleaned up, and you get a written guarantee covering the work for 365 days. If the repair fails within a year, we come back and make it right at no charge. That’s the 365-Day Done Right Promise, and it’s included with every repair.
How Much Does Roof Repair Cost in San Antonio?
A typical shingle roof repair in San Antonio runs between $350 and $800 for a small area – think a handful of shingles, a vent pipe boot, or a section of flashing. Larger repairs, like an entire slope or storm damage, run $1,100 to $2,200. Roof leak repair falls in the $250 to $650 range for isolated flashing or shingle work, or $900 to $1,500 when the decking underneath has rotted and needs replacing. Flat roof repair typically runs $400 to $900 for a membrane patch, and $1,200 to $2,500 when wet insulation has to be cut out and rebuilt. Emergency roof repair, when we’re tarping and sealing at night, runs $350 to $800 for the temporary fix with the permanent repair quoted separately. Metal roof repair runs $400 to $1,000 for fastener replacement, and commercial work typically ranges from $800 to $2,500 for a targeted membrane repair.
What affects the price most is the condition of the decking underneath, the roof’s pitch and height, and the accessibility – a single-story ranch in Windcrest is faster and safer to work on than a three-story Victorian in King William. We don’t charge for estimates, and the written price includes labor, materials, and cleanup. If you want to avoid overpaying, get a written price up front, ask what happens if the repair fails, and check whether the company sends a photo ID’d technician – if they won’t show you who’s coming, ask yourself why.
Our Service Area Near San Antonio
We repair roofs across San Antonio and the surrounding communities, including Schertz and Cibolo to the northeast, Boerne and Bulverde to the north, Kirby and Windcrest to the east, and Alamo Heights, Terrell Hills, and Castle Hills in the city’s core. We also serve Floresville and the area near Lackland AFB. If you’re looking for Roof Repair in Schertz or Roof Repair in Cibolo, we’re close by and can typically schedule within a few days of your call. For the full picture on what we do, see our home page or the main Roof Repair in San Antonio page.
Serving San Antonio, TX - Our Local Coverage Area
We’re based in the San Antonio area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
Frequently Asked Questions About Roof Repair in San Antonio
Roof repair is the process of fixing a specific problem on an existing roof – a leak, a damaged section of shingles, failed flashing, or a broken seal around a vent – without replacing the entire roof. In San Antonio, most repairs are prompted by hail damage, wind-lifted shingles, or the slow failure of flashing under constant heat. The goal is to stop water intrusion and restore the roof’s integrity at a fraction of the cost of a full replacement. Call (254) 276-4369 for a free estimate on any roof repair.
Most residential roof repairs in San Antonio take between one and four hours on the roof, depending on the extent of the damage and the weather. A simple shingle replacement or flashing fix is usually done in under two hours. If we’re replacing a roof slope or rebuilding a section of wet decking, the job may stretch to a full day. We’ll give you a time estimate in writing before we start.
Most roof repairs in San Antonio fall between $350 and $2,200 depending on the repair type, the roof’s pitch, and the condition of the decking underneath. Small shingle or flashing repairs run $250 to $650, while full slope replacements or storm damage run $1,100 to $2,200. Emergency tarping at night runs $350 to $800. We give you a written price before any work starts, so you know the number before you commit. Call (254) 276-4369 for an exact quote on your repair – estimates are free.
Yes, we repair and install GAF, CertainTeed, and Owens Corning shingle roofs, along with Boral and other manufacturer-recognized brands. We’re familiar with the most common product lines in San Antonio, which means we can match an existing roof’s color and profile for a clean repair. Whether you need a patch on an Owens Corning Duration roof or a full slope of CertainTeed Landmark, we can help. Call (254) 276-4369 to schedule a free estimate.
Yes, we answer the phone 24/7 with a live person, and we handle emergency roof repairs across San Antonio. If your roof is actively leaking, we’ll tarp and seal it to stop the water, then schedule the permanent fix as soon as conditions allow. Emergency tarping typically runs $350 to $800, with the permanent repair quoted separately and in writing. Call (254) 276-4369 any time – day or night.
Every repair we do includes our 365-Day Done Right Promise in writing. If the work isn’t done right within a year, we make it right at no charge. That includes a free second visit if a repair fails. We also put the price in writing before we start, so the guarantee and the cost are both on paper from day one. That’s the Mercer standard, and it applies to every repair.
You don’t need to do much – we handle the roof work, the cleanup, and the safety. Move any vehicles out of the driveway or directly below the work area if you can, and keep pets inside while our technician is on the roof. We’ll send you the name and photo of your technician before they arrive, so you know exactly who’s knocking. If you have attic access, we may ask to take a quick look inside to confirm where water is traveling.
Schedule Your Roof Repair Service in San Antonio Today
A leaking roof doesn’t fix itself, and the cost of waiting is always higher than the cost of the repair. Call (254) 276-4369 to schedule your free estimate – a live person answers 24/7, and we’ll give you a written price before any work starts. Every repair includes our 365-Day Done Right Promise in writing. With Mercer Roofing Co San Antonio, you’ll know exactly who’s coming, exactly what it costs, and exactly what you’re getting.
Written by Grant Whitlock, Owner at Mercer Roofing Co San Antonio, serving San Antonio since 2000.