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
Fast, Reliable Roof Repair Across Commerce
Roof repair in Commerce, CA usually runs between $350 and $1,400 for the problems we see most often, and most jobs are done in a single visit. If you’ve noticed water staining on ceiling tiles, gravel piling up in your gutters, or peeling membrane at a roof drain, you’re dealing with exactly what we fix every week in this city. Our crews work throughout Commerce, from the warehouse rows off South Atlantic Boulevard to older industrial buildings near the 5 Freeway, and we understand how flat commercial roofing here fails differently than elsewhere in Los Angeles County. Call (213) 521-8272 and a live person answers, day or night.
The difference is in how we work. Before any technician arrives, you’ll get their name and photo sent to you directly. They’ll show up in a clean, marked uniform and present a photo ID badge at the door. That’s the Threshold Standard, and it matters if you’re a homeowner or a property manager who doesn’t open the door for just anyone.
Why Mercer Roofing Co Los Angeles Is Commerce’s Preferred Roof Repair Company
Commerce is not a typical residential roofing market. The city is dominated by industrial buildings, warehouse campuses, and commercial structures, many built between the 1960s and 1980s. That means most of the roofs we work on are flat or low-slope, and they fail in specific ways: gravel washout, seam splits from vibration, and UV alligatoring that turns exposed asphalt brittle. A technician who only knows shingle roofs is going to misdiagnose half of what’s happening up there. Our Roof Repair team works with built-up roofing, modified bitumen, and single-ply membranes every day, and knows when to patch versus when a building owner needs to plan for full replacement.
Grant Whitlock leads our crews here, and he sets the standard for how we approach every building: inspection first, written findings, and a written price before a single nail goes in. No work starts without it. We’re part of the Threshold Group family, founded in 2000, and every technician is background-checked, identity-verified, and held to that standard on every visit. For Commerce building owners, that matters, because you’re not just letting someone onto your roof, you’re letting someone onto your property, past your fence line, often after hours.
Our customers in Commerce tell us the same thing over and over: they appreciate knowing exactly who’s coming, and they appreciate that the price we give is the price they pay. We include a written guarantee on every repair we do, and if that repair fails within 365 days, we come back and fix it. That’s not a promise buried in fine print. It’s included with every job.
Styles & brands we work with
Storm Damage Roof Repair in Commerce
Storm Damage Roof Repair in Commerce starts with the same reality every local building owner knows: when a winter storm drops heavy rain on this city, gravel-surfaced built-up roofs take the hit first. The rain carries gravel toward drains and scuppers, and the exposed asphalt underneath starts cracking within weeks, then leaks the next time it rains. That’s the cycle, and it repeats across Commerce from Bandini Boulevard to the rail yards north of Washington Boulevard.
Storm repair here isn’t just about finding the wet spot. It’s about identifying where the next failure is already starting. We inspect the whole roof surface, not just the leak, and we look for loose gravel, ponding water, soft decking, and flashing that’s pulled away at parapet walls. When you call, we give you a straight answer about what’s urgent and what can wait, with prices attached to each item.
Gravel Loss and Exposed Asphalt
When gravel washes off a built-up roof, the asphalt below has no protection from Commerce’s inland sun. It alligators and cracks fast, often in a single summer. We remove loose material, clean the surface, and install a modified bitumen membrane or a reinforced coating to restore the roof’s ability to shed water and reflect heat.
Ponding Water and Drain Failure
Flat roofs rely on drains, and when drains clog during a storm, water ponds. On older Commerce buildings, ponding water finds every weakness in the membrane. We clear the drainage path, re-secure the flashing around the drain assembly, and repair the membrane so water moves off the roof the way it was designed to.
Metal Roof Repair in Commerce
Metal Roof Repair in Commerce typically involves commercial buildings with low-slope metal roof panels, and the most common problem is leaking at screw fasteners and panel seams. The building expands and contracts with temperature swings, and over thousands of those cycles, the rubber washers under the screws crack and fail. Add in the constant vibration from truck traffic and forklifts inside these buildings, and those fasteners work loose faster here than almost anywhere else in the region.
We repair metal roofs by replacing failed fasteners with new, larger-diameter screws and EPDM washers, resealing overlapping seams, and treating rust areas before they become holes. If a panel is beyond repair, we can replace a single panel without tearing off the whole roof, which keeps costs down for building owners watching their maintenance budget.
Rust and Corrosion at Eave Lines
Commerce is inland, so we don’t have the salt air problem that coastal cities do, but decades of wet-dry cycling still takes a toll on metal eave edges and gutter aprons. We cut out corroded sections, splice in new metal, and coat the repair so it doesn’t just fail again next season.
Penetration Seals and Stack Flashings
Exhaust vents, HVAC curbs, and conduit penetrations are metal roof weak points. The caulk and sealant used on those penetrations fails after a few seasons in Commerce’s heat. We remove the old sealant, install new compression flashing systems or waterproof tape, and bring the penetration back to a condition that holds for years, not months.
Trusted Brands We Service in Commerce
We work with GAF, Atlas, and CertainTeed materials regularly, but for Commerce’s flat and low-slope buildings, we also install modified bitumen and single-ply systems from manufacturers the local warehouses already trust. That means when we repair a roof, the materials match what’s already up there, not whatever was cheapest at the supply house that morning. We keep common flashing, sealants, and membrane materials staged in our trucks so a typical Commerce repair doesn’t wait on a parts run across town. That matters when you’ve got a roof leak and a crew of 20 people below you can’t work.
See the difference
Before
After
Before
After
Before
AfterCommon Roof Repair Problems We See in Commerce Homes
- Gravel washout on built-up roofs: Those original 1960s and 1970s roofs lose gravel during heavy rain events. The exposed asphalt alligators in the heat that follows, and leaks appear within months.
- Seam and flashing splits from vibration: Constant forklift and truck traffic physically shakes these buildings. Seams near penetrations fail first, and the damage is often hidden until water shows up inside.
- Parapet wall waterproofing failures: Many Commerce buildings have low parapet walls with coping metal that’s loosened over time. Water gets in at the top, runs down inside the wall, and rots the decking from underneath.
- Original construction that has simply aged out: A roof installed in 1980 has outlived its expected service life by a decade or more. On a Commerce warehouse, that’s not a maintenance issue, that’s a full replacement decision waiting to happen.
On a Commerce warehouse off East Washington Boulevard, our crew repaired a 1970s built-up roof where constant forklift vibrations had split seams near roof penetrations. We removed cracked flashing and failing drip edge, installed new modified bitumen membrane along with ice and water shield, and restored drainage so the next heavy rain wouldn’t pour through the decking. Those kinds of failures are specific to this market, and that’s the kind of repair this page is about.
Pricing for Roof Repair in Commerce, CA
You should know what roof repair costs in Commerce before you call, so here are the numbers we give our customers in this market. A leak repair on a flat built-up roof runs $400 to $900 depending on access and the condition of the roof. Flashing repair around a parapet or penetration averages $500 to $1,100. A single metal roof panel replacement, including fasteners and resealing, runs $700 to $1,400. Gravel removal and spot membrane repair starts around $350. A full inspection with a written report is free when you hire us for the repair.
What changes the price is the roof’s age, the number of penetrations, whether we need lift equipment or roof access ladders, and how much damage is hidden beneath the surface. We write all of this into a line-item quote before any work begins, and that quote is the price. No surprises on the invoice. Call (213) 521-8272 to schedule your free estimate, and a real person will answer.
We Also Serve Cities Near Commerce
Our crews cover more than just Commerce. If you manage or own property in Commerce or the surrounding area, we also handle roof repairs in Los Angeles, Burbank, South Gate, and Lynwood. Dispatch and scheduling are coordinated from our Los Angeles office, but the people who show up at your building know these streets and these roof types. You’ll get the same written price, the same photo ID badge, and the same guarantee no matter which property you call about.
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
Constant truck and forklift traffic translates into vibrations that travel through the building’s structure, which weakens roof seams and flashing, especially near penetrations and curbs. These buildings move more than residential structures, and that movement cycles the roofing material thousands of times a year, causing fatigue cracks and split seams that leak. When we repair these roofs, we choose materials and fastening methods that tolerate movement, rather than using rigid systems that will simply split again.
Get it looked at before the next heat wave. Once the gravel is gone, the exposed asphalt alligators and cracks within weeks in Commerce’s inland UV, and a roof that was watertight in March becomes a leaky mess by August. We’ll remove loose gravel, clean the surface, and install a modified bitumen membrane or a reinforced elastomeric coating to protect the roof from both water and sun. Call (213) 521-8272 and we’ll send someone with a written price.
Flat and low-slope roofs hold water and take sun at a brutal direct angle, so they need membrane systems that seal continuously rather than overlapping shingles that shed water by gravity. Built-up roofing, modified bitumen, and single-ply membranes are the standard for Commerce’s commercial stock, and using asphalt shingles on a low-slope roof guarantees pooling and leaks.
We can match the function and appearance closely, but not always the exact product, because some of those old materials aren’t manufactured anymore. What we can do is repair in kind where the existing system is still serviceable, and where it’s not, we’ll quote a replacement using modern built-up or modified bitumen systems that meet current code and deliver better performance than the original.
If the leaks are isolated and the underlying decking is sound, repair is usually the answer. If the membrane is alligatored across large sections, the insulation is waterlogged, or the decking is rotting, patching becomes throwing good money after bad. We’ll do an inspection, show you what we find with photos, and give you prices for both options so you can decide without pressure. The estimate is free, and the written guarantee applies either way.
Written by Grant Whitlock, Owner at Mercer Roofing Co Los Angeles, serving Commerce since 2000.
Call Mercer Roofing Co Los Angeles at (213) 521-8272 for a free roof repair estimate in Commerce. A live person answers 24/7, and every job starts with a written price and a written guarantee.