New Flat Roof Installation · FlatGuard®
A new flat roof installation puts a modified bitumen or other low-slope roof on an ADU, addition, garage or patio cover, with the slope, drains and tie-ins planned before the first layer goes down. QRS builds new flat roofs across Los Angeles and Orange County as part of the FlatGuard® Roof System. Request an estimate to get started.
Overview
New low-slope roofs are a big part of how homes in Los Angeles and Orange County grow: backyard ADUs, room additions, new garages, solid patio covers, contemporary homes built from scratch and remodels that change part of a house to a low-slope roof. With no old roof to work around, this is the one chance to get the fundamentals right. That means enough slope for water to move, drains and scuppers in the right places, and clean flashing wherever the new roof meets a wall, a parapet or an existing roof.
The earlier we see your plans, the more we can help, because the slope is usually built into the framing and those decisions are far easier to make on paper than to correct later. Once the deck is on, our crews install modified bitumen or another low-slope system matched to how the roof will drain and what it will carry, whether that’s a rooftop HVAC unit, a skylight or nothing at all. Already have a worn flat roof? Then a flat roof replacement is the service you’re looking for.
Our Process
How a new flat roof installation works
Plans and site review
We review your plans or visit the site to look at the planned slope, the deck and where water will leave the roof.
- Slope and drainage direction
- Drain and scupper locations
- Walls, parapets and tie-ins
Written scope and price
You get a written scope naming the roof system, flashings and drainage details, along with the price, before work starts.
Edges, drains and flashings
Once the deck is ready, we prepare the roof edges and build the flashing details at drains, scuppers, walls and curbs.
Membrane and tie-ins
We install the roof system named in your scope and build the transition to your existing roof so water flows away from the joint, not into it.
- Sealed laps across the whole roof
- Tie-ins to tile or shingle roofs
- Vents, skylights and HVAC curbs
Final walkthrough
Before we call the job done, we show you the finished roof, including photos of the layers underneath, and explain your 10-year workmanship warranty.
Why Choose QRS for New Flat Roof Installation?
On new construction, a roofer’s input matters most before the roof is built, while slope and drain locations can still change.
Early drainage input
We’ll tell you where water will go before the roof exists, so you’re not dealing with ponding after move-in.
Careful tie-ins
The joint between new and existing roofs gets flashing detailed for how water actually flows across it.
Photo-documented details
We photograph the base layers, flashings and tie-ins as the roof goes on, so there’s a record of work that’s hidden once it’s finished.
The QRS Guarantee
Every new roof we install is backed by our 10-year workmanship warranty, so you know we stand behind the work.
Frequently Asked Questions
Straight answers about flat roof installation.
Do you pull the permits?
Yes. When your roofing project needs a building permit, we pull it for you.
When should I bring a roofer into my ADU or addition project?
Ideally while the plans are still being finalized. That’s when slope, drain locations and roof-to-wall details are easy to adjust. If framing is already underway, we can still look at it before any roofing goes on.
Can a new flat roof tie into my existing tile or shingle roof?
Yes. The transition needs careful flashing so water coming off the pitched roof lands on the flat roof without getting under either one. We plan that detail in your written scope, whether the main house has a tile roof or a shingle roof.
Do you install flat roofs on patio covers?
Yes, on solid patio covers framed and sheathed to take a roof. We check the slope and how the cover meets the house, because the joint at the wall is a common leak point on patio roofs.
Can you coordinate with my contractor?
Yes. We partner with contractors and can coordinate directly with yours on scheduling and roofing details. Learn more about our contractor partnerships.
How is the price for a new flat roof worked out?
It depends on the roof’s size, the system, the drainage details and how the roof ties into the rest of the house. Each of those items is spelled out in your written scope, with the price, before work on the roof begins. To get the process moving, request an estimate and tell us about your project.
Tell us what you need.
Two minutes. A clear next step. No pressure.
Get a Straight Answer on flat roof installation
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 roof installation, with a written scope and price.
- CSLB licensed, bonded & insured
- 10-year workmanship warranty
- Google customer reviews
