Brentwood, Los Angeles 90049White Flat Roof in Los Angeles 90049View project Flat Roofing in Los Angeles & Orange County with FlatGuard®
A flat roof that drains well and keeps you dry.
Flat roofing built so water leaves the roof. New installs, replacements and repairs for modified bitumen and other low-slope roofs on homes, ADUs, garages and patio covers across Los Angeles and Orange County. Every drain, seam and flashing is detailed. Our FlatGuard® Roof System covers low-slope replacements and new installs. Start with a free roof evaluation.
- Licensed flat roof contractor serving LA & Orange County · CSLB #1061942
- Free roof evaluation
- Written price before any work
- 10-year workmanship warranty (call for details)
Slope that moves waterLaps that stay sealedFlashing at every wall and curb
Flat roofing built so water leaves the roof.
Certified with the manufacturers we install
280 Google reviews
Accredited, A+ rating
Find us on Yelp
Flat Roofs Need Their Own Kind of Detail
QRS is a flat roof specialist in Los Angeles, California, and Orange County: our flat roofing covers new installs, replacements and repairs for low-slope roofs on homes, ADUs, garages and patio covers. Low-slope roofs are everywhere in Southern California: on mid-century and modern homes, over garages, patio covers and room additions, on new backyard ADUs, and tucked behind the parapet walls of Spanish-style houses. Every one of them still has to drain. That takes a gentle, deliberate slope that carries rainwater to a drain, a scupper (an opening through the parapet) or a gutter instead of letting it sit. When that slope is missing or a drain is blocked, water ponds, the sun bakes the membrane, and seams and flashings start to give way.
We install modified bitumen and other low-slope systems, chosen for your roof’s condition, how it drains and what sits on it, from HVAC equipment to skylights. Our advice comes from a roofer on your roof, not a salesperson at your kitchen table. The free roof evaluation photo-documents the membrane, seams, drains and flashings, explains the findings in plain English and ends with a clear next step: repair, monitor, maintain or replace. You see a written scope and price before any work begins, and finished installs carry our 10-year workmanship warranty (call for details).
As Orange County flat roofers, we serve Irvine, Costa Mesa, Newport Beach, Anaheim, Santa Ana, Huntington Beach and the rest of Orange County with the same free roof evaluation, written price and 10-year workmanship warranty (call for details) as our Los Angeles homeowners.
Our Flat Roofing Services
From one open seam to a full tear-off, each service starts with an honest look at what your flat roof actually needs.
Flat Roof Replacement in Los Angeles, CA · FlatGuard®Flat roof replacement in Los Angeles, CA: a full tear-off down to the deck and a new modified bitumen or low-slope system, planned around how your roof drains.Learn more 
Flat Roof RepairLeaks, blisters, open seams and failed flashings traced to the source, repaired carefully and documented with photos.Learn more 
New Flat Roof Installation · FlatGuard®New low-slope roofs for ADUs, additions, garages and patio covers, with slope, drains and tie-ins planned from the start.Learn more 
Torch Down Roof Installation · FlatGuard®A modified bitumen base sheet and cap sheet fused with heat into one continuous surface, with every seam, wall and drain detailed.Learn more 
Roof Inspection Services · RoofScan 360®Our free, roofer-led roof evaluation for shingle, tile and flat roofs: every finding photographed and explained, with one clear next step.Learn more - The Roof Care PlanThree priced plans, scheduled before and after the rains, with a written photo report every visit — see pricing for your roof size.Learn more
Where leaks start
Where flat roofs leak
Most leaks begin at details, not in the middle of an intact membrane: the drains, seams, flashings and everything that passes through the roof.
Local roofers. Real accountability.
A roofer looks at your roof first, and you get photos and a written price before anything starts. One family-owned company answers for the roof, from the first visit to the walk across the finished roof with you.
- Licensed, bonded and insured California contractor, CSLB #1061942
- Certified with the manufacturers whose systems we install
- We pull the permits
- A written scope and price before any work
- 10-year workmanship warranty on installs (call for details)
280Google reviews from the people we roof for
2020Licensed California contractor since
12Crews across Southern California
4Counties: Los Angeles, Orange, Riverside and San Bernardino
What a Well-Built Flat Roof Gets Right
- Slope that moves waterWater should flow steadily toward the drains and scuppers, then down through downspouts or rain gutters. We look for low spots and ponding first, because standing water wears a roof out faster.
- Laps that stay sealedFlat roof leaks usually start at a joint, not out in the open field of the roof. Laps, the overlaps where one sheet meets the next, get extra care because that’s where water looks for a way in.
- Flashing at every wall and curbParapet walls, HVAC curbs, vents and skylights all interrupt the membrane. Each one needs flashing detailed to direct water away, not just a bead of sealant.
A written price, before any work.
Start with a free roof evaluation. A roofer tells you what’s worth fixing, and you decide what to hire us for.
- No charge. The drone roof evaluation is free.
- Photo documentation. See what we see, in plain English.
- Clear next step. Repair, monitor, maintain or replace.
- Optional $199 Roof Check. Only if you want it: a tune-up where we seal the vents, pipes and flashings.
- Credited toward replacement. The $199 counts toward the price if you move forward.
- Pay after the visit. No deposit for the Roof Check.
Free roof evaluation
Roof evaluation
Freeno obligation
We use drone footage to see the real condition of your roof. The evaluation costs nothing, and there’s no obligation.
Book my free evaluationFeatured projects
Recent roofing projects
See all projectsBrentwood, Los Angeles 90049White Flat Roof in Los Angeles 90049View project 
Hollywood Hills West, Los Angeles 90046Round Flat Roof Replacement in Hollywood Hills West 90046View project 
Mid-Wilshire, Los Angeles 90019Tile & Flat Roofing at a Multi-Family Building in Mid-Wilshire 90019View project Roofing reviews from the people we work for
Read more reviews★★★★★
“I was recommended this roofing company by a friend, and I’m really glad I went with them. I had a problem with water leaking into my attic from the flashing around the chimney, and the team was very helpful from the start. Tony was the roofer working with me, and he was always professional and friendly. He took care of resealing the flashing and chimney, which made the leak much better right away. He kept in touch with me after the work, and now we’re working on sealing the chimney even more to make sure everything is perfect. I feel confident that the team will get everything fixed up right. Based on my experience so far, I’d definitely give them five stars. Thanks to everyone there for their hard work!”
★★★★★
“Quality roofing specialist exceeded my expectations from start to finish. The crew showed up on time, explained everything clearly, and the quality of the work was outstanding. They were professional, honest, and left the property spotless when the job was done. It’s hard to find reliable contractor in LA, but these guys definitely earned my trust. I highly recommend them to anyone looking for quality roofing work. Five stars all the way!”
★★★★★
“I was looking to replace my shingles roof in Encino and contacted a few roofing companies in the neighborhood. Out of four roofers, Quality Roofing Specialist was the only one that worked with my budget as well as my schedule. Their work was fantastic, and we love the outcome. They exceeded my expectations. I will definitely recommend to friends.”
★★★★★
“Tony was very responsive when I called. The entire process was faster than I expected. With his continuous supervision the whole project went so smoothly and professionally, the place was cleaned up completely. I have a beautiful roof now :)”
Flat roofing near you
QRS offers flat roofing across Los Angeles County, Orange County, Riverside County, San Bernardino County and Santa Clara County, from our offices in West Hollywood, Woodland Hills, Vernon and San Jose. Not sure we reach you? Check your ZIP code on our service areas page, or call (310) 340-1643.
Wherever you are, it starts the same way: a roofer looks at the roof, you get photos of what we find, and a written scope and price comes before any work.
Flat roofing questions, answered
Straight answers about flat roofing.
How do I maintain a flat roof in Los Angeles?
Keep the drains, scuppers and gutters clear, especially before the rainy season and after Santa Ana winds. Look for water that is still standing a day or two after rain, and keep foot traffic and other trades off the roof unless needed. Have a roofer check the seams, flashings and parapet caps once a year; a roof maintenance plan schedules those visits with a photo report each time.
Is a flat roof actually flat?
No. Unlike steep-slope roofs, which shed water quickly, a flat roof is really a low-slope roof that needs a gentle pitch toward its drains. On a well-built one that slope is often too gentle to notice, but it moves water off the roof. If water still sits in the same spots long after the rain stops, the slope or the drainage needs attention.
What is modified bitumen?
It’s a tough, asphalt-based roofing membrane with built-in reinforcement, typically installed in layers with overlapping, sealed laps. It handles routine foot traffic and strong sun well, one reason it’s so common on low-slope homes in Southern California. The right system for your roof still depends on its condition and drainage.
Do you work on the flat sections of Spanish-style homes?
Yes. Many Spanish and Mediterranean homes pair tile roofing with flat sections hidden behind parapet walls, drained by scuppers through the wall. We look at the flat areas, the parapet caps and the wall flashings, not just the tile you can see from the street.
Do you work on flat roofs for commercial buildings?
Yes. As a flat roof contractor in Los Angeles and Orange County, we also work on the low-slope roofs of offices, shops, warehouses and many other commercial buildings, planned around each building’s condition and drainage. Visit our commercial roofing section for details.
Do you work on flat roofs in my part of LA or Orange County?
We work across Los Angeles County and Orange County, in cities such as Glendale, Torrance, Anaheim, Santa Ana and Huntington Beach as well as Los Angeles itself. Our service area page shows whether your city is on the list.
How long does a flat roof last?
There’s no single answer. The roofing system, how well the roof drains, how much sun it takes and how often it’s maintained all play a part, and water that sits on a flat roof after rain shortens its life. Rather than guessing from the roof’s age, a free roof evaluation looks at its actual condition.
Start here
Tell us what you need.
Two minutes. A clear next step. No pressure.
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Get a Straight Answer on flat roofing
Tell us what’s going on with your roof. A roofer, not a salesperson, looks at it and gives you a clear next step on flat roofing, with a written scope and price.
- CSLB licensed, bonded & insured
- 10-year workmanship warranty (call for details)
- Google customer reviews
