Flat Roof Replacement · FlatGuard®
A full tear-off down to the deck and a new modified bitumen or low-slope system, planned around how your roof drains.
Residential Roofing
Flat Roofing Services · FlatGuard®
Flat roofing from QRS covers 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 so water leaves the roof, and our FlatGuard® Roof System covers low-slope replacements and new installs. Start with a free roof evaluation.
Flat Roofs Need Their Own Kind of Detail
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.
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.
What a Well-Built Flat Roof Gets Right
Slope that moves water
Water 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 sealed
Flat 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 curb
Parapet 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.
Frequently Asked Questions
Straight answers about flat roofing.
Is a flat roof actually flat?
No. A well-built flat roof has a slight slope, often too gentle to notice, that 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. Offices, shops, warehouses and many other commercial buildings rely on low-slope roofs, and we plan that work around each building’s condition and drainage too. 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.
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
- Google customer reviews
