Metal roofing
Architectural shingles
Tile roofing
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Flat & low-slopeFree roof inspection with deck photos before we talk money - GAF and Owens Corning certified installation
Fast, Reliable Roof Repair Across San Marcos
Roof repair in San Marcos runs $350 – $1,400 for most shingle, flashing, and leak fixes, with full redecking jobs on older homes landing between $3,800 and $7,200. The price spread comes down to what’s under the shingles. Homes east of Texas State University often sit on spaced decking that was never meant to carry modern shingles, so a “simple” patched leak turns into a structural conversation fast. We know that because we’ve opened up hundreds of San Marcos roofs and seen what Flash Flood Alley storms actually do to them.
Call (361) 202-8874 and you’ll get a real person, not a voicemail. We answer live 24/7.
Before any work starts, you get a written price. Before any technician arrives, you get their name and photo. That’s how we operate everywhere we serve, including all of San Marcos.
Why Mercer Roofing Co Austin Is San Marcos’s Preferred Roof Repair Company
San Marcos homeowners have a specific worry that most roofing companies ignore: who is actually coming to the door. Our Roof Repair technicians are background-checked, identity-verified, and uniformed. You receive their name and photo before the visit. When they arrive, they show a photo ID badge at the door. That’s the Threshold Verified standard, and it’s non-negotiable for every crew member on every San Marcos job.
We’re part of the Threshold Group family, founded in 2000. Each location is independently owned and operated, and dispatch for San Marcos is coordinated from our Austin office. Crews live and work here. They know the difference between a 1920s bungalow off Belvin Street and a 2004 subdivision off Wonder World Drive, and they know what each roof type needs after a Hill Country hailstorm.
Every San Marcos repair carries the 365-Day Done Right Promise: if the work isn’t right within a year, we make it right. The guarantee is written, not spoken. You get it with every job, along with a free second visit if a repair fails.
Styles & brands we work with
Metal Roof Repair in San Marcos
Metal Roof Repair in San Marcos is a steady call for us, especially on the newer homes and commercial buildings going up along Hunter Road and out toward the outlet malls. Metal roofs shed rain better than shingles during Flash Flood Alley downpours, but they fail at the seams. Loose fasteners, failed gaskets on exposed screws, and separated panel laps are the usual culprits. The fix is surgical: reseat or replace fasteners, replace worn gaskets, re-seam or reseal the laps. Metal repair in San Marcos typically runs $400 – $900 for fastener and sealant work, and $900 – $2,400 when panels need replacing or a section needs re-screwing after wind lift.
Fastener and Gasket Work
Over time, metal roof screws back out from thermal expansion. The neoprene washers dry and crack from the Texas sun. We replace them with new fasteners and gaskets, then reseal the seams. It’s a half-day job in most cases.
Panel Replacement After Hail or Wind
Hail dents metal panels but rarely punctures them. Wind is harder on metal: it works panels loose at the laps. When panels are too stretched or the laps won’t reseal cleanly, we cut and replace the damaged section and match it to the existing profile.
Commercial Roof Repair in San Marcos
Commercial Roof Repair in San Marcos covers a lot of ground: flat and low-slope buildings near the university, restaurant rooftops in downtown, and warehouse spaces along the I-35 corridor. These roofs fail at the penetrations first. Exhaust fans, HVAC curbs, gas lines, and drains all break the membrane, and a leaking penetration can soak a ceiling before anyone notices. Commercial repairs in San Marcos typically run $800 – $3,500 for membrane patches, flashing rebuilds, and drain repairs. Larger TPO or modified bitumen section work lands at $4,000 – $9,000.
Membrane Patches and Penetration Seals
We identify where water is getting in, not just where it’s showing up. A stain on the ceiling is often twenty feet from the actual leak. We trace it, open the membrane, repair or replace the failed flashing, and seal it with materials matched to the existing roof.
Drain and Scupper Repairs
When flat roofs pond, it’s usually a clogged or failed drain. Flash Flood Alley rain overwhelms drains that worked fine for years. We clear, repair, or replace drain assemblies and re-flash the surrounding membrane so water moves off the roof instead of standing on it.
Trusted Brands We Service in San Marcos
We work with the brands San Marcos roofs already have. Owens Corning, IKO, and Atlas are three we install and repair most often, and we carry matching accessories for all three, so a repair doesn’t leave a patchwork of mismatched shingles. That matters on a 2008-era San Marcos subdivision where the original shingle is still available but the color lot has shifted. We take the time to match right. Parts are locally sourced where possible, and our crews carry the common flashing, sealant, and underlayment stock they need to finish most San Marcos jobs in one visit.
See the difference
Before
After
Before
After
Before
AfterCommon Roof Repair Problems We See in San Marcos Homes
- Hail-split cedar shake and three-tab over spaced decking. East of the university, original cedar shake and three-tab roofs sit on gapped boards, and hail splits them wide open. Water goes straight into the attic before a repair can even be scheduled.
- Valley and penetration leaks during Flash Flood Alley storms. Old flashing loses its seal against rapid runoff, and valleys are where San Marcos roofs fail first. The volume of water moving through a valley in a May downpour is brutal on aging metal.
- Ponding on low-slope 1970s ranch roofs. Those long, shallow roofs common in mid-century San Marcos neighborhoods hold water after heavy rain. Granule loss and decking rot follow, and a patch can’t fix the root issue.
- Wind-blown shingles on new subdivisions. The 2000s-plus neighborhoods near the high school and along McCarty Lane see shingle blow-off in spring storms. Missing shingles expose the underlayment and let wind-driven rain climb under the remaining shingles.
Pricing for Roof Repair in San Marcos, TX
What you’ll pay in San Marcos depends mostly on what’s under your shingles. A simple shingle replacement or flashing repair on a 2010s roof runs $350 – $700. Vent boot replacement: $150 – $300. Valley repair with new metal and ice and water shield: $600 – $1,200. But when we’re dealing with a pre-1970s home east of campus with spaced decking, a leak repair turns into redecking, and that’s a $3,800 – $7,200 job. We’ll tell you which one you have before any work starts. Call (361) 202-8874 for a written estimate. It’s free, and the price we give you is the price on the invoice.
We Also Serve Cities Near San Marcos
While this page is written for San Marcos homeowners, our crews regularly work in Austin, Bastrop, Cedar Park, and Hutto. The same written pricing, the same Threshold Verified technician standards, the same 365-Day Done Right Promise apply in every city. If you’re on the edge of San Marcos in either direction, you’re still in our service area.
Serving San Marcos, TX - Our Local Coverage Area
We’re based in the San Marcos area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs About Roof Repair in San Marcos
Because the original roofs were built on spaced decking, which means boards with gaps between them instead of a solid plywood or OSB surface. Modern building code requires solid decking under architectural shingles, and once hail splits expose the gaps or water has soaked the old boards, a patch won’t pass inspection. Full redecking is a code compliance issue, not an upsell. Most east-of-campus homes we repair need it. Call (361) 202-8874 and we’ll tell you honestly whether yours does.
Ice and water shield is a self-adhering membrane that goes down before the shingles in the places water is most likely to get in: valleys, around vent pipes, and along the eaves. In San Marcos we install it in every valley and at every penetration on a repair, not just on full replacements. That’s the standard we write into every job. If the old valley flashing failed because it was metal-only with no membrane under it, we add the membrane. A valley repair with new metal and ice and water shield runs $600 – $1,200 in San Marcos. For an exact quote, call (361) 202-8874.
We recommend repairing with shingles rated for at least a 110 mph wind uplift, which is standard for the IKO, Atlas, and Owens Corning architectural lines we install in San Marcos. Spring storm gusts and Hill Country wind events regularly test that rating, and going lower means you’ll be calling us again after the next blow. We only stock wind-rated architectural shingles for San Marcos work. For a written price on a repair, call (361) 202-8874.
You can often repair a section, but the repair has to address the ponding. If water is standing on the roof after rain, the slope itself is working against you, and a patch over rotted decking will fail again. We’ll inspect the decking under the damaged area. If it’s solid, a section repair runs $700 – $1,800. If the decking is spongy or the slope is too shallow to drain, you’re looking at a larger asphalt or modified bitumen replacement on that section. We’ll show you what we find before we quote it, in writing. Call (361) 202-8874 to schedule a free inspection.
Most small repairs (under about 100 square feet of shingles) don’t require a permit in San Marcos, but anything structural, including full redecking, does. When a permit is pulled, the city inspector will check that the roof meets current code: solid decking, proper underlayment, and correct fastening. That means older homes with spaced decking get upgraded to solid decking as part of the repair. We pull the permit, we pass the inspection, and we handle it all. For a written quote that includes permit costs, call (361) 202-8874.
Written by Grant Whitlock, Owner at Mercer Roofing Co Austin, serving San Marcos since 2000.