Architectural shingles
Metal roofing
Tile roofing
GAF
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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 Commerce
Roof repair in Commerce runs $450 – $2,800 for most residential jobs, with flat-roof patching and scupper repair on the lower end and decking replacement on the higher end. Our crews work the Bandini/Telegraph industrial belt, the residential pockets near City Hall, and every side street off Eastern Avenue, so we know what these roofs throw at you. Commerce isn’t like most LA County cities. It’s four square miles of 1940s stucco homes sitting shoulder-to-shoulder with tilt-up warehouses, and the sun treats both the same way. One call to (866) 850-2496 gets you a roof inspection, a line-item estimate, and an honest answer about whether you need a patch or something bigger. We don’t oversell and we don’t rush you into a replacement when a targeted repair is the right call.
Why Windmill Roof Repair Is Commerce’s Preferred Roof Repair Company
We’ve repaired enough Commerce roofs to know the difference between a quick flashing fix and a scupper that’s been quietly rotting a deck for ten years. Local homeowners call us because we show up, inspect what’s actually there, and tell them the truth about it. Our Roof Repair team works flat and low-slope systems daily, which matters when two-thirds of the houses in your zip code are built-up tar-and-gravel from the Eisenhower era. Ruben Ochoa runs every project with one rule: the roof’s condition dictates the scope, not a sales target. That’s why we offer a standalone roof inspection before any work is agreed to. You see the findings, you get a written estimate, and you decide. No pressure, no manufactured urgency.
Styles & brands we work with
Commercial Roof Repair in Commerce
Commercial Roof Repair in Commerce means patching TPO and built-up membranes on tilt-up warehouses along the I-5/605 corridor where UV damage and seam failure are the daily reality. A Commerce facility manager or property owner is usually dealing with leaky seams, ponding water around failed drains, or cracked flashing at rooftop penetrations. Warehouse roof repairs here typically run $900 – $6,500 depending on membrane type, square footage, and whether the decking is involved. We bring seven brand options to the table: GAF, CertainTeed, Owens Corning, IKO, Atlas, Tamko, and Boral. That means the repair gets matched to what’s already up there, not what we’re incentivized to sell.
TPO Seam and Penetration Repair
UV bakes Commerce warehouse roofs all summer, and the seam tape on older TPO cracks long before the membrane itself fails. We clean, hot-air weld, and reinforce failing seams, then check every penetration: vents, exhaust fans, conduit supports. If the deck is still sound, you didn’t need a new roof. You needed someone who actually looked at the seams.
Scupper, Drain, and Parapet Repair on Industrial Buildings
Flat warehouse roofs in Commerce live and die by their drains. Decades of debris and UV-cracked membrane at parapet transitions channel water into walls and interior spaces after the first winter rain. We clear blocked scuppers, install retrofit drains where ponding persists, and rebuild parapet flashings with materials matched to the existing system. Most jobs are done without interrupting warehouse operations.
Roof Leak Repair in Commerce
Roof Leak Repair in Commerce usually starts with an interior stain and ends with a clogged scupper, failed vent boot, or cracked flashing at a parapet wall. On the older flat-roof homes near Bandini Boulevard, it’s rarely the membrane that fails first. It’s the decades of recoats piling up at the edges, sending water backward under the roofing and into the deck. Leak repairs in Commerce range from $450 for a vent boot replacement up to $2,800 when saturated decking must be cut out and replaced. We scope it accurately before we touch anything.
Scupper Failure and Decking Rot
On a 1952 flat-roof home near Bandini Boulevard, our crew opened the parapet to repair a leak and found decades of recoats had clogged the scupper, sending water under the membrane and into the decking. We replaced the saturated built-up roofing, added new underlayment and flashing at the scupper, and installed a retrofit drain. The decking replacement was priced separately and we got written approval before cutting into it. That’s how we handle every Commerce repair: inspect first, price the surprise, get your sign-off.
Vent Boot, Flashing, and Valley Repairs
On the shingle-roofed homes sprinkled through Commerce’s residential pockets, leaks trace back to cracked vent boots, corroded step flashing, and open valley seams. We replace boots with brand-matched materials, rebuild flashing at walls and skylights, and re-seal valleys where shingles have lifted. A flashing repair typically runs $350 – $900. A valley repair runs $600 – $1,400.
Trusted Brands We Service in Commerce
We work across seven major shingle and membrane brands: GAF, CertainTeed, Owens Corning, IKO, Atlas, Tamko, and Boral. For Commerce customers, that broad lineup matters more than most cities because this isn’t a single-roof-type town. A 1950s bungalow on a residential side street and a TPO warehouse on Bandini need different products, and we stock local parts for both. No brand exclusivity, no preferred-vendor arrangement. The right material for your roof, not ours. If your existing roof is GAF and you need a patch, we match it. If your CertainTeed membrane has failed at the seams, we repair with compatible material. See it before you sign anything: our inspection gives you the full picture.
See the difference
Before
After
Before
After
Before
AfterCommon Roof Repair Problems We See in Commerce Homes
- Clogged scuppers flooding interiors. Commerce’s flat-roofed homes and warehouses collect decades of debris at parapet edges. The first December rain backs up at the scupper and water travels under the membrane into the ceiling below.
- UV-degraded seam tape on warehouse TPO. Inland LA Basin sun doesn’t care whether the roof is on a house or a distribution center. Seam tape cracks before the membrane fails, and those hairline cracks are where the leaks start.
- Hidden decking rot beneath old recoats. Repeated patching over 60-year-old built-up roofing buries the real problem. Saturated decking hides under what looks like a solid surface until someone actually opens the parapet and looks.
- Failed vent boots and flashing on shingle roofs. The shingle homes in Commerce’s residential pockets face the same thermal cycling as the flat roofs. Rubber boots crack, flashing lifts, and small gaps turn into stained ceilings after a rare heavy rain.
Pricing for Roof Repair in Commerce, CA
We Also Serve Cities Near Commerce
Our crews work throughout the 90101 area and the surrounding cities. If you’re in Maywood, Bell, Cudahy, or Bell Gardens, we’ll come out, inspect, and give you the same honest scoping we bring to every Commerce job.
Serving Commerce, CA — Our Local Coverage Area
We’re based in the Commerce 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 Commerce
Yes, in most cases we can clear the scupper, replace the damaged flashing, and install a retrofit drain without tearing off the entire membrane. What we can’t know without opening the parapet is whether water has saturated the decking underneath. We inspect that area first, show you what we find, and give you a line-item price for the repair and any deck work separately. Call (866) 850-2496 to schedule the inspection.
We write an allowance into the contract before we start. If we open the parapet and find saturated decking, we stop, photograph it, give you the exact square footage and cost, and get your written sign-off before cutting. You’re never surprised by a bill for work you didn’t approve. We’ve done enough Bandini-area bungalows to know the rot is there more often than not, so we plan for it from the first estimate.
Cracked seam tape on TPO membranes is the most common cause. Inland LA Basin heat bakes the tape until hairline cracks form, and water gets through long before the membrane itself fails. We hot-air weld and reinforce those seams, then check every penetration and drain on the same visit. Call (866) 850-2496 for a commercial roof inspection of your Commerce facility.
We repair built-up tar-and-gravel roofs whenever the underlying felt and decking are still sound. That means patching the membrane, rebuilding parapet flashings, clearing scuppers, and adding new gravel where it’s worn thin. If the decking is gone or the felt has rotted through, we’ll tell you honestly and give you a replacement scope with brand options from GAF, CertainTeed, Owens Corning, and the rest of our seven-brand lineup. Repair when you can, replace when you must.
Most targeted repairs on Commerce homes don’t trigger a permit, but when we’re cutting into decking or replacing a large roof section, Commerce’s building department may require one. We pull it, schedule the inspection, and include those costs as a separate line item so you see exactly what’s city-mandated versus what’s labor and materials. A permit in Commerce for re-roof work typically adds $400 – $900 in fees and inspection costs. Call (866) 850-2496 and we’ll walk you through what your specific project needs.
Written by Ruben Ochoa, Owner at Windmill Roof Repair, serving Commerce since day one.