Commercial Roof Repair in San Antonio, TX
24-Hour Response. 40+ Years of Experience. No Subcontractors.
When a commercial roof leaks, your business loses money by the hour. Alexander's Roofing has been handling commercial roof repair in San Antonio since 1980 - leaks, hail damage, storm damage, flashing failures, and full-system restorations for office buildings, warehouses, retail centers, apartment complexes, and industrial facilities across Bexar County.
We answer the phone 24/7 and have a technician on-site within 24 hours for active leaks. Our own crews — no subcontractors — handle every job. If insurance is involved, we document hail and wind damage to industry standards (photos, measurements, materials manifest) so adjusters see the full scope.
Call (210) 436-1135 for a free commercial roof inspection. We work around your business hours when possible.
Signs Your Commercial Roof Needs Repair
Commercial roofs hide problems longer than residential roofs because property managers can't physically see them every day. Look for these warning signs and call (210) 436-1135 for a free inspection:
- Water stains, discoloration, or active drips on interior ceilings or walls
- Pooling water on the roof that doesn't drain within 48 hours after rain
- Visible cracks, blisters, bubbles, or splits in the membrane
- Sagging or uneven roof line - a structural warning sign
- Tree limbs touching, rubbing, or hanging over the roof surface
- Granules, pieces of membrane, or roofing debris in downspouts or gutters
- Damage to flashings around HVAC units, vents, pipes, or skylights
- Mold or mildew growth on ceiling tiles or in attic spaces
- Unexplained increase in heating or cooling costs (insulation may be wet)
If you've noticed any of these signs at your commercial property,
contact us to schedule a
free inspection!
Types of Commercial Roof Repairs We Handle
Leak repair
Locating and sealing leaks in flat membranes (TPO, EPDM, PVC, modified bitumen), at penetrations, and around flashings. We use FLIR thermal imaging for hard-to-find leaks.
Hail damage repair
Patching, recoating, or partial replacement after hail strikes. Full documentation for your insurance claim.
Flashing repair and replacement
Around HVAC units, parapets, walls, vents, pipes, and skylights — where most leaks actually start.
Seam repair
Re-welding or re-sealing failed seams on TPO, PVC, and EPDM systems.
Membrane patching
Cuts, punctures, and tears from foot traffic or dropped tools.
Wind damage repair
Re-securing lifted membrane edges, re-fastening blown-off sections.
Pipe boot and penetration repair
Replacing cracked or degraded boots that allow water entry.
Drain and scupper repair
Restoring proper drainage to eliminate ponding water.
Skylight and curb repair
Re-flashing and sealing around all roof penetrations.
Emergency Commercial Roof Repair (24/7)
When water is actively entering your building, every hour costs you money and risk. We answer the phone 24/7 and prioritize active leaks above scheduled work.
Same-day response: Most emergency calls get a technician on site within 24 hours - same day for active leaks. During peak hail season we triage by severity, but active water entry always jumps the queue.
Immediate stabilization: Tarping, temporary patching, and water diversion to stop further damage while we assess the full scope for permanent repair.
Operations continuity: We coordinate with your facility manager to minimize disruption - early-morning starts, after-hours work, or weekend service when needed.
Call (210) 436-1135 anytime - for emergencies, our line is monitored after-hours.
Storm and Hail Damage Repair - Insurance Claim Documentation
San Antonio's hail season can damage commercial roofs in minutes. The damage often isn't fully visible from the ground - but it's still there, and it's covered by your property insurance if documented correctly.
Thorough damage documentation. Photos of every elevation, hail bruise patterns measured against industry standards, materials manifest, and a detailed scope-of-work estimate matched to your policy. We use drones for large or hard-to-access roofs.
Direct work with your adjuster. We work with every major insurance carrier in Texas. Texas law prohibits us from acting as your adjuster, but we provide the documentation adjusters need to write a fair scope.
Direct work with your adjuster. We work with every major insurance carrier in Texas. Texas law prohibits us from acting as your adjuster, but we provide the documentation adjusters need to write a fair scope.
Direct work with your adjuster. We work with every major insurance carrier in Texas. Texas law prohibits us from acting as your adjuster, but we provide the documentation adjusters need to write a fair scope.
Commercial Roof Repair or Replacement - How to Decide
Repair is usually the right call. Most commercial roof problems are localized and can be fixed for a fraction of the cost of a full replacement. Here's how we help you decide:
Repair makes sense when:
- Damage is localized (one section, one penetration, one storm event)
- The roof is less than 75% of its expected lifespan
- The deck underneath is structurally sound
- Less than 25% of the membrane shows widespread aging or damage
- Insurance is covering specific damage, not full replacement

Replacement is the right call when:
- The roof is past its expected lifespan and you're repairing the same issues repeatedly
- Widespread membrane failure (more than 25% of surface area)
- Wet or rotted decking under the membrane
- Multiple penetrations failing at once
- Your insurance scope covers full replacement
Not sure which applies? Schedule a free inspection and we'll show you the photos, explain the options, and give you the truth - even when the truth is that you only need a $400 repair instead of the $30,000 replacement someone else quoted.
Typical Commercial Roof Repair Costs in San Antonio
Every commercial roof is different, and we always provide a written estimate after inspection. But here are typical ranges so you have an idea of what to expect:
| Types of Repair | Typical cost range |
|---|---|
| Minor leak repair (small patch, flashing fix) | $300 - $800 |
| Moderate repair (multiple flashings, larger membrane patches) | $800 - $3,000 |
| Major repair (large-area membrane replacement, multiple sections) | $3,000- $15,000 |
| Full restoration with silicone or acrylic coating | $3 - $7 / sq ft |
| Emergency tarping and temporary repair | $400 - $1,200 |
Free inspection, free written estimate — no obligation. Call (210) 436-1135.
Our Commercial Roof Repair Process
01 Free inspection within 24 hours.
Call (210) 436-1135. We schedule commercial inspections within 24 hours, same day for active leaks. David or a senior inspector walks the roof - not a salesperson.
02 Detailed written estimate with photos.
You receive a complete repair scope, materials specification, labor estimate, and total cost. No vague ranges. If insurance is involved, the documentation goes directly to your adjuster.
03 Schedule around your operations.
Most repairs complete in 1–3 days. We coordinate with your facility manager for early-morning starts, after-hours work, or weekend service when business operations require it.
04 Our crews complete the work
Every roofer on your property is an Alexander's employee. No subcontractors. We protect your property - interior areas, landscaping, parking - and clean up at the end of each day.
05 Final walkthrough and warranty.
We walk the completed repair with your facility manager. All workmanship is covered by our written warranty. We're available for follow-up service for the life of the warranty.
Why San Antonio Businesses Choose Alexander's for Roof Repair
We work with every commercial roofing material
TPO, EPDM, PVC, modified bitumen, gravel built-up, asphalt shingles, standing seam metal, clay tile, concrete tile. Whatever's on your roof, we've repaired it.
40+ years of San Antonio experience
David Alexander founded the company in 1980 and still personally inspects roofs. Many of our property-manager customers weren't born yet when we started.
Fair, transparent pricing
Written estimates with itemized scope. No upselling, no surprise change orders. We tell you the truth even when the truth is a smaller job than someone else quoted.
Free inspection and estimate
No commitment. David or a senior inspector comes to your property, photographs the roof, and provides a written assessment with options. Schedule yours at (210) 436-1135.
Need a Full Commercial Roof Replacement Instead?
Sometimes repair isn't enough. If your commercial roof is past its lifespan or showing widespread failure, we also handle full system replacements. See our commercial roof replacement services
Avoid Future Repairs With a Maintenance Program
The best repair is the one you don't have to make. Our annual commercial maintenance program catches problems while they're small — clogged drains, lifted flashings, hairline cracks — before they become expensive emergencies. See our commercial roof maintenance services
Ready for a Free Commercial Roof Inspection?
Property managers, building owners, and facility managers across San Antonio have trusted Alexander's with their commercial roofs since 1980. Read our reviews on
Google, BBB, and Angi.
Call (210) 436-1135 to schedule a free commercial roof inspection. We respond to most calls within 24 hours, same-day for active leaks.
