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 Replacement Across Downey
A full roof replacement on a Downey home typically runs $11,500 to $24,000 depending on the square footage, pitch, and what’s hiding under the old shingles. On the older tract homes that fill the 90240, 90241, and 90242 ZIPs, the final number often shifts once tear-off reveals what’s underneath. That’s the honest reality here. Our Roof Replacement crew has been opening up Downey roofs long enough to know exactly what to expect, and we price that way from the start. Call (866) 974-2271 to schedule a free estimate.
Downey isn’t a city where you can quote a roof from the curb. The mid-century housing stock, the shallow pitches, the layers of old roofing stacked over original sheathing; it all matters. We walk the roof, check the attic, and give you a written line-item quote before any work begins.
Why Koreatown Roofing Is Downey’s Preferred Roof Replacement Company
We’re roofing specialists, not generalists. Every job we take is a roofing job. That means when we quote a Downey home, we’re not also thinking about a kitchen remodel or a concrete pour. We’re thinking about decking, underlayment, flashing, and ventilation. That focus shows up in how we price the work and how we handle the surprises that older Downey homes tend to reveal.
Our reputation in Downey is tied directly to the neighborhoods we work in. When we tear off a roof near Furman Park or over in the 90240 flats, our name is attached to that street. Manny Cordero built Koreatown Roofing on that kind of neighborhood accountability. We don’t run a rotating crew out of a call center. The people who quote your roof are the people who understand why a 1952 tract home needs different handling than a 1990s build.
We work with seven manufacturer brands: GAF, CertainTeed, Owens Corning, IKO, Atlas, Tamko, and Boral. That’s your roof, your material choice. When we recommend a product for a Downey home, it’s because that product fits the roof structure and the budget, not because we’re locked into one supplier’s inventory.
Written by Manny Cordero, Owner at Koreatown Roofing, serving Downey and surrounding communities.
Styles & brands we work with
New Roof Installation in Downey
New Roof Installation in Downey usually means one of two things: a complete tear-off and replacement on an existing home, or a fresh roof on a new structure like a rear addition or detached garage. Both require a different approach than a simple overlay. On a complete tear-off, we strip every layer down to the framing so we can see the real condition of the decking and rafters. On new construction, we build the system from the deck up, installing the underlayment, flashing, and shingles or membrane in the correct order so the roof actually does its job for decades.
A typical New Roof Installation on a 1,200 to 1,600 square foot Downey home runs $13,000 to $22,000. Smaller additions or garage roofs often land in the $6,500 to $11,000 range depending on the roof area and the material you choose. Every quote is written, line-itemed, and explained before you sign anything.
What Gets Replaced
On a full replacement, we’re not just swapping shingles. We remove every existing layer, inspect the decking board by board, replace whatever has rotted or failed, and install new underlayment, drip edge, valley metal, and flashing. That’s the only way to know the roof you’re paying for is actually sound underneath.
Material Choices for Downey Heat
Downey summers bake roofs with relentless UV. Asphalt shingles with a high solar reflectance rating hold up better here than cheap three-tab products. Architectural shingles from GAF, Owens Corning, and Atlas give you a thicker, more impact-resistant surface that also looks right on a mid-century street. We’ll walk you through the tradeoffs without pushing one brand.
Reroofing in Downey
Reroofing in Downey is the most common job we do, and it’s where the square-count guys get themselves into trouble. Reroofing means replacing the roof that’s already there, and on most Downey homes, there’s more than one layer to remove. Many of these 1950s and 1960s tract homes are carrying their second or even third layer of shingles over the original skip sheathing. When we tear that off, we often find rot, split boards, and framing that needs sistering before we can put anything new down.
A straightforward reroof with one existing layer on a typical Downey ranch runs $11,500 to $18,500. When we have to remove multiple layers and replace significant decking, the number climbs to $16,000 to $24,000. That’s not an upsell. It’s what the roof actually needs to be done right.
Multiple Layer Tear-Offs
Every extra layer adds weight and traps moisture against the sheathing. Removing those layers down to clean wood is the only way to assess what you’re actually dealing with. We quote the tear-off honestly and include a decking allowance in writing so you’re not hit with a surprise change order mid-job.
Low-Slope Transitions
Attached garages, patio covers, and flat rear additions are common on Downey homes. These low-slope areas can’t be treated with standard shingles. They need membrane systems, proper flashing at the transition point, and often a reflective coating to survive the sun. We handle those details as part of the reroof, not as an afterthought.
Trusted Brands We Service in Downey
We install products from GAF, CertainTeed, Owens Corning, IKO, Atlas, Tamko, and Boral. That’s a broader material roster than most roofing contractors will offer, and it matters when you live in a city where roof structures vary wildly from street to street. We work with the brands you already trust, and we’ll recommend based on what your Downey roof actually needs. If the job calls for a Modified Bitumen cap sheet on a flat patio roof, we’re not stuck trying to make shingles work. We stock local parts for our Downey jobs and keep turnaround tight from estimate to final inspection.
Common Roof Replacement Problems We See in Downey Homes
- Hidden dry rot in original skip sheathing. Many Downey homes built in the 1950s used 1×6 boards spaced with gaps rather than solid plywood. After sixty-plus years under multiple shingle layers, those boards are often split, rotten, or too far gone to hold a nail. A low-bid quote never covers this because the bidder never looked.
- Second- and third-layer tear-offs trapping moisture. Layering new shingles over old ones seals moisture against the original sheathing. By the time the roof leaks, the deck underneath is mush. We strip to the framing on every reroof so we can see what’s actually there.
- Cracked low-slope membranes at garages and patio covers. The original built-up roofs on Downey’s attached garages and patio covers were often sealed with tar and mastic. Sun dries that material until it cracks, and winter rain wanders to an interior wall instead of the ceiling. Roofers who only quote shingle squares never even look at these transitions.
- Santa Ana wind damage to edges and older shingles. The hot, dry wind events that sweep through this part of Los Angeles County lift shingles at the rake and eave edges. On older roofs, that’s the first place failure shows up. A proper replacement includes upgraded edge metal and fastening patterns that hold the perimeter tight.
See the difference
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AfterPricing for Roof Replacement in Downey, CA
Here’s what you can expect to pay in the Downey market right now. Basic architectural shingle reroof on a 1,200 square foot single-story ranch: $11,500 to $14,500. Larger home or steeper removal, around $15,000 to $19,000. Full replacement with significant decking replacement on a 1950s tract home: $18,000 to $24,000. Flat or low-slope membrane systems for garage and patio roof sections run $6 to $11 per square foot installed. What moves the number is what’s under the shingles, not the shingles themselves. Our quotes include a written decking and framing allowance so you know the range before we start, and any surprise is priced and approved in writing before we touch it. Call (866) 974-2271 for your free estimate.
We Also Serve Cities Near Downey
Koreatown Roofing handles roof replacement work across the surrounding communities. If you’re in Bell Gardens, Santa Fe Springs, Paramount, or Pico Rivera, the same team that serves Downey will handle your roof with the same material-first approach. Downey is our focus, but we’re active throughout the neighboring ZIPs when a roof needs opening up and done right.
Serving Downey, CA — Our Local Coverage Area
We’re based in the Downey 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 Downey
The most common hidden issue is rotted or split skip sheathing that was never designed to be re-roofed multiple times. On a 1952 tract home near Furman Park, we opened up a rear low-slope addition and found the original built-up membrane had dried and cracked, allowing water to travel to an interior wall, plus rusted 1×6 skip sheathing that failed the nail-pull test. We replaced the decking with 7/16″ OSB, added a self-adhered underlayment, and installed a GAF Modified Bitumen cap sheet with new drip edge and flashing, then coated the surface with a reflective white coating to handle the UV load. If your quote doesn’t include a decking allowance, it isn’t an honest Downey roof quote. Call (866) 974-2271 to get a real number.
Yes, a roof replacement in Downey requires a building permit. More to the point, once the roof is open, the inspector sees what we see. If the existing decking or framing doesn’t meet current code, it gets replaced. That’s not optional. Our quotes assume the permit and the code-compliant decking upgrade because we’ve done enough Downey homes to know what the inspector will flag. We pull the permits ourselves and schedule the inspections. Call (866) 974-2271 with your address and we’ll tell you what your specific roof will likely trigger.
Downey sits inland enough that the marine layer shows up mostly as morning haze, and it usually burns off fast. The bigger factor for your roof is not persistent moisture but the UV exposure. Summer heat and constant sun bake asphalt shingles and dry out flat-roof coatings, which is why reflective surfaces and self-adhered underlayments matter more here than in a true coastal city like Long Beach. The occasional winter rain then exploits every seam that the sun has been cooking all year. Call (866) 974-2271 and we’ll assess what your roof’s specific exposure is doing to it.
A square is 100 square feet of roof area. Most roofers quote by the square, which is fine, but the square count only covers the roof surface it doesn’t cover what’s under it. On a Downey home with original skip sheathing, the square count might say 14 squares while the actual job also includes 40 sheets of decking replacement, new flashing, low-slope membrane work, and structural sistering. If a quote only shows a price per square, ask for the decking allowance in writing. Ours always includes it. Call (866) 974-2271 for a quote that spells out the full scope, not just the square count.
The best way is to treat them as their own roof system, not as an afterthought at the end of a shingle job. Low-slope areas need a membrane product: Modified Bitumen, TPO, or a coated built-up system, depending on the deck condition and the budget. We flash the transition where the shingle roof meets the flat section with metal that actually sheds water, not tar that cracks in two summers. On a Downey roof, these transitions are where most leaks start. We include them in every replacement quote. Call (866) 974-2271 to have us look at yours.
Call for Your Free Downey Roof Replacement Estimate
If your Downey home is ready for a new roof, or if you’re tired of wondering what’s under the shingles, let’s look together. We’ll walk the roof, get into the attic, and give you a written line-item quote with the decking and framing allowance built in, not added later. Licensed and insured, with one contractor handling your roof through every stage: inspection, repair, and replacement. Call (866) 974-2271 to schedule your free estimate.
Written by Manny Cordero, Owner at Koreatown Roofing, serving Downey and the surrounding Los Angeles County communities.