Low-slope commercial roofs · San Antonio, TX
Leaks traced to the source, ponding drained, and worn flat roofs recovered or replaced. We work on every low-slope system your building may have: TPO, PVC, EPDM, modified bitumen, built-up and coated roofs.
Under a minute. A project manager calls you back within 2 business hours.
Something went wrong sending your request. Please call (210) 384-6843 or try again.
Request received
Prefer to talk? (210) 384-6843
From one stubborn leak to a 200,000 sq ft re-roof. Same crews, same standards, any membrane.
Water on a flat roof travels before it drips. We follow it back to the seam, flashing or puncture and fix that.
Tapered crickets, new drains and wider scuppers so water leaves the roof within 48 hours.
Tear-off to the deck, deck repairs, code insulation and a new membrane, phased over occupied space.
A dry, single-layer roof can take a cover board and new membrane without a full tear-off.
Silicone over a sound roof adds 10 to 15 years for roughly half the price of replacement.
Drains cleared, seams probed and a photo report every spring and fall, before storm season.
Most San Antonio buildings already have one of these. We repair all of them and recommend the one that fits when it is time to replace.
Membrane options · bar = typical life
White, heat-welded seams. The value pick for most warehouses and retail.
Welded like TPO but resists grease and chemicals. Restaurants and labs.
Black rubber with taped seams. Flexible, simple to patch.
Multi-ply asphalt with a granule cap. Takes heavy foot traffic.
Not a new roof: a seamless layer that extends a sound one.
Fixes for the usual flat-roof problems
Sloped boards between drains so water stops sitting in the low spots where membranes age fastest.
Drains and scuppers sized for our cloudbursts, with overflows so a clogged drain cannot flood the roof.
Most leaks start at curbs, pipes and edges. We reflash them and install tested edge metal.
We hold approvals with the major low-slope manufacturers, so the membrane is chosen for your roof, not for a sales quota.
What the code and the manufacturers require on a low-slope roof in Bexar County.
| Minimum slope | New membrane roofs need ¼ in per ft of slope; flat structures get it from tapered insulation |
|---|---|
| Ponding | Water still on the roof 48 hours after rain; most warranties exclude damage it causes |
| Drainage | Primary drains plus overflow drains or scuppers, sized for local rainfall intensity |
| Insulation | About R-25 continuous above the deck on re-roofs (2021 energy code, climate zone 2) |
| Cool roof | Low-slope roofs here generally need a reflective surface: 0.55 aged solar reflectance |
| Layer limit | Two roof coverings at most; a building with two needs a full tear-off |
| Edge metal | Tested perimeter edge systems (ANSI/SPRI ES-1) to hold the roof in high wind |
| Fire rating | UL / FM Class A assemblies |
| Service life | 15 to 30 years depending on membrane, drainage and upkeep |
We walk the roof, follow the water path and scan with infrared or core cuts to map wet insulation.
Repair, restore, recover and replace priced side by side, with photos, in 48 hours.
Crickets, drains and scuppers first. A new membrane on a ponding roof ages early.
We open only what we can close by evening, so tenants stay dry every night.
Curbs, pipes, walls and edges flashed to the manufacturer’s details, not caulked.
Drains flow-tested, seams probed, then the manufacturer’s inspector issues the warranty.
Pros
Cons
Five questions about your flat roof. No email, no form.
Did a scan or core cut find wet insulation across large areas?
Does the building already have two roofs on it?
Is the roof more than 20 years old?
Is the leak in one spot you can point to?
Does water stand on the roof two days after rain?
Your answer
Answer the questions
We will tell you honestly if another system fits better.
Get a free assessmentLow-slope roofs cover most commercial square footage in San Antonio.
Visible sloped roofs steeper than about 3:12 belong in metal, tile or shingles, not a flat-roof membrane.
2026 installed prices. Repairs are per visit; roof work is per square foot with labor, materials and disposal.
Typical flat roof replacement
$9.50 – $15/ sq ft
A 30,000 sq ft roof: about $285k – $450k
What moves the price
| Scenario | Price |
|---|---|
| Leak repair, one visitSeams, flashings, punctures | $450 – $2,500 |
| Drain or scupper rebuildEach, with new flashing | $900 – $3,500 |
| Silicone restorationDry roof, per sq ft | $3 – $7.50 |
| Recover over one roofCover board + membrane, per sq ft | $7.50 – $11 |
| Tear-off and replaceR-25 insulation, per sq ft | $9.50 – $15 |
| Tapered insulationAdded for ponding, per sq ft | +$1.50 – $3 |
Leak calls inside Loop 1604 are usually on the roof the same day, and the suburbs within the hour.
Something else? Ask a project manager.
Most commercial flat roof leak repairs cost $450 to $2,500 per visit in 2026. Rebuilding a drain or scupper runs about $900 to $3,500, and a full replacement with tear-off and insulation costs about $9.50 to $15 per square foot.
Repair when the leaks are few and the insulation is dry. Restore with a coating when the roof is sound but aging. Recover or replace when large areas of insulation are wet, the roof is past its service life, or it already has two layers.
By adding slope, not sealant. We install tapered insulation or crickets that steer water to the drains, and add or enlarge drains and scuppers where needed. Water should be gone within 48 hours of rain.
About 15 to 30 years. White TPO and PVC handle our heat best; modified bitumen and EPDM usually land at the lower to middle of that range. Good drainage and twice-yearly maintenance add years to any of them.
No. Commercial “flat” roofs are low-slope: new membrane roofs need at least ¼ inch of fall per foot so water drains. Perfectly flat decks get that slope from tapered insulation.
For most buildings, a white 60-mil TPO. Choose PVC where grease or chemicals reach the roof, modified bitumen where there is heavy foot traffic, and a silicone coating when the existing roof is still dry.
Written by the crews who do this work. All articles
We walk the roof, trace the leak, scan for wet insulation and send a photo report with repair, recover and replace prices side by side.
Ready to choose a membrane? Compare the systems we install.
