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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 Replacement Across Commerce
Roof replacement in Commerce, CA usually means a flat or low-slope membrane system, not a shingle tear-off. A full flat roof replacement in Commerce typically runs $9,000 to $18,000 for a mid-century single-family home, and $18,000 to $40,000 or more for a warehouse bay along the Telegraph Road corridor. If your decking has rotted out, add $2 to $4 per square foot for sheathing replacement. Call (855) 341-6021 and we’ll inspect it first, document what we find, and give you a written line-item quote before any work is proposed.
We’re Millstone Roofing, and Nelson Ibarra runs our crews out of Pomona. We work in Commerce regularly, from the older homes near Bandini Boulevard to the industrial blocks off Slauson Avenue. We know what the inland heat does to these roofs. We know the building stock. And we know that nobody in Commerce wants a roofer who shows up and starts selling before he’s even looked at the deck.
Why Millstone Roofing Is Commerce’s Preferred Roof Replacement Company
Commerce isn’t a shingle town. Most of the residential stock off Eastern Avenue and the 5 freeway is mid-century construction with flat or low-slope roofs, and the commercial buildings are far more extensive than the houses. That means the contractor who quotes shingle prices all day is guessing. We don’t guess. We inspect first, every single time, and every recommendation comes with documented findings from that inspection. You get photographs, moisture readings, and a written scope. Not a pitch.
Our customers in Commerce call us because we stock multiple roofing material lines, GAF, CertainTeed, Owens Corning, IKO, Atlas, Tamko, and Boral included. That matters here. A warehouse owner near Telegraph Road needs a modified bitumen cap sheet and liquid-applied flashing, not a shingle bundle. A homeowner on a quiet street off Atlantic Boulevard might want a TPO membrane. We recommend the material that fits the building and the budget, not whatever our supplier happened to have on the truck that week.
And the crews you see on day one are the crews you see on the final day. No handoffs between a sales team, a subcontracted tear-off crew, and a third-party installer. One company, one crew, from the first inspection to the final fastening.
Styles & brands we work with
Flat Roof Replacement in Commerce
Flat Roof Replacement in Commerce is the core of what we do here, because the city’s warehouse stock along Telegraph Road and the older homes near the 710 were built with flat or near-flat roofs. A flat roof replacement means tearing off the old built-up roof or worn membrane down to the deck, checking the insulation and sheathing, replacing anything saturated or rotted, and installing a new waterproof system. On a typical Commerce warehouse, that means a new modified bitumen cap sheet, fresh flashing at every penetration, and new drip edge at the perimeter. On a home, it often means a single-ply TPO or PVC membrane with new drain collars.
The cost depends on what we find under the old roof. A clean tear-off with sound decking on a home runs $9,000 to $14,000. Larger commercial bays start around $18,000 and climb based on square footage, insulation depth, and the number of penetrations. If the decking has been wet for years, expect to add sheathing replacement at $2 to $4 per square foot. That’s the honest range, and we’ll show you the numbers in writing before anything starts.
When a Recoat Won’t Cut It
A quick elastomeric coating over an alligatored built-up roof looks fine for a season, then fails at the seams. If the membrane has blistered, split, or pulled away from the flashing, the deck may already be wet. Coating a roof that needs tear-off is just buying time, and it’s usually money you could have put toward the replacement.
Inspection Before Every Quote
We don’t quote a flat roof replacement in Commerce without walking the roof and checking core samples. Moisture trapped in the insulation changes the scope completely. Our inspection findings tell us, and you, whether the insulation is dry, whether the deck is sound, and what the drainage situation actually looks like. The quote follows the findings. Never the other way around.
Roof Installation in Commerce
Roof Installation in Commerce refers to putting a new roof system on a building that either never had one, or where the existing roof has been completely removed and the structure is ready for new material. That’s different from a repair, and it starts with the same step as everything else we do: an inspection. We inspect, we document, we scope. Then we install. For a Commerce warehouse, that installation is typically a multi-ply modified bitumen system with a granulated cap sheet. For a home, it’s a TPO or PVC membrane, sometimes with tapered insulation to fix drainage.
A new roof installation on a Commerce warehouse bay lands between $18,000 and $40,000 depending on size and roof access. A home installation runs $9,000 to $16,000. These are the numbers we actually see in this part of the Los Angeles basin, not national averages. Call (855) 341-6021 and we’ll give you a line-item quote after the inspection.
New Construction and Tear-Offs
When we install on new construction in Commerce, we work from the structural drawings and the insulation plan, not from guesses. For tear-offs, we don’t know the full scope until the old roof comes off and we see the deck. That’s why our quotes include a per-square-foot rate for decking replacement if it’s needed. You know the number before we open anything up.
Drainage First
Ponding water is the fastest way to kill a new membrane, and a lot of Commerce’s older low-slope roofs were never re-pitched. We inspect the drainage on every installation. If the roof ponds, we correct the slope with tapered insulation or a re-pitch before installing the new membrane. Installing a new roof over bad drainage just starts the clock on the next failure.
Trusted Brands We Service in Commerce
We service the brands that matter in Southern California roofing: GAF, CertainTeed, Owens Corning, IKO, Atlas, Tamko, and Boral. For Commerce, where most of the work is flat and low-slope, the relevant systems are GAF’s TPO and modified bitumen lines, CertainTeed’s Flintlastic, and Atlas’ commercial membranes. We stock materials for these systems locally, so Commerce customers aren’t waiting on a distributor’s delivery schedule. The recommendation comes from the building’s needs and your budget, not from a supplier quota. Manufacturer-backed warranties are available through the brand programs, and we handle the paperwork.
See the difference
Before
After
Before
After
Before
AfterCommon Roof Replacement Problems We See in Commerce Homes
- Alligatoring and blistering on old built-up roofs. Decades of thermal cycling along the Telegraph Road corridor makes the asphalt surface crack into alligator patterns. When you see that pattern, the field seams are usually next to fail.
- Sealant and flashing failure at penetrations. Sustained 90°F-plus UV breaks down sealant at penetrations and perimeter edges during the dry season. The roof looks fine until the first rain shows the leak.
- Ponding from low-slope drainage that was never corrected. If the original roof was installed flat and the drains are the high point, water sits and the new membrane ages early. We re-pitch or add tapered insulation during replacement.
- Wet insulation hidden under a surface that still looks intact. A roof can look fine from the ground while the insulation underneath is saturated. Core samples during the inspection tell us the truth.
Pricing for Roof Replacement in Commerce, CA
Here’s what we see in Commerce, honestly. A flat roof replacement on a single-family home runs $9,000 to $18,000. A warehouse or commercial bay replacement runs $18,000 to $40,000 and up, driven by square footage and the condition of the insulation and deck. Decking replacement adds $2 to $4 per square foot when the plywood or OSB is rotted. Insulation replacement, if the old insulation is wet, runs $1 to $3 per square foot depending on type and depth. The single biggest cost variable is what we find under the old roof. That’s why we inspect first and quote in writing. Estimates are free. Call (855) 341-6021 and we’ll schedule the inspection.
We Also Serve Cities Near Commerce
Millstone Roofing works throughout the surrounding area, including Maywood, Bell, Cudahy, and Bell Gardens. Our Roof Replacement team handles the same flat and low-slope systems across these cities. If you’re in Commerce or nearby, call (855) 341-6021 to set up an inspection.
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 Replacement in Commerce
Only if the membrane is still structurally sound, the seams are intact, and the insulation is dry, and after 40-plus years of inland UV, that’s rare. Alligatoring on the surface usually means the asphalt has oxidized through the cap sheet, and the seams are close behind. A coating stops surface water for a season but doesn’t fix split seams, failed flashing, or wet insulation. We’ll take core samples during the inspection and tell you honestly whether a recoat buys time or just delays the inevitable. Call (855) 341-6021 and we’ll document what the roof actually shows us.
Most warehouse flat roof replacements in Commerce take five to ten working days from tear-off to final inspection. The schedule moves based on roof size, weather windows, and what we find under the old membrane. If the deck needs repairs or the insulation has to come out and be replaced, add time. We’ll give you a written schedule as part of the quote, and we’ll update you as the work progresses.
Commerce requires a city building permit for a full roof replacement, and the work must pass a city inspection before it’s signed off. We pull the permits and schedule the inspections as part of the job. The permit cost is included in our quote, so the price you see is the price you approve. We don’t start work until the permit is posted.
The line items that change are the ones we can’t see until the old roof comes off: rotted decking, wet insulation, rotted edge blocking, and failed drain assemblies. Each of these is listed in our quote at a per-square-foot or per-unit rate, so the price doesn’t move without you knowing the rate in advance. If the deck is sound, the quote holds. Call (855) 341-6021 and we’ll show you exactly what’s in the quote and what each contingency covers.
Occasionally yes, on the older single-family homes in Commerce that were built with a traditional gable or hip roof. If the roof has enough pitch, a shingle replacement with Atlas or Tamko architectural shingles can be the right call and typically runs $12,000 to $22,000 on a mid-century home. But most of the stock in Commerce is flat or low-slope, and shingles on a low-slope roof void the manufacturer’s warranty. We’ll tell you which system fits your roof, and why.
If you own a home or warehouse in Commerce and the roof is showing its age, get it inspected before the next rainy season. The leak that shows up in December usually started in July. Call Millstone Roofing at (855) 341-6021 to schedule your free inspection and written estimate.
Written by Nelson Ibarra, Owner at Millstone Roofing, serving Commerce and the surrounding Los Angeles basin.