Your flat roof has been patched more times than you can count, and the last contractor said it’s time for a new one. Maybe it’s the roof over your garage or addition, or over a small commercial building you own. Before you sign anything, you want to understand what a good flat roof installation in Kansas City, MO actually involves, so you can tell a solid bid from one that just covers up the old problems.
That’s a smart instinct. Two bids for the “same” flat roof can describe very different jobs. One fixes the drainage and replaces wet insulation. The other rolls new membrane over everything and leaves the reasons the old roof failed right where they were.
APC Roofing installs and repairs flat and low-slope roofs on homes and light commercial buildings. We’re GAF Certified, licensed and insured, in business since 2017, and your estimate is free. Call 913-398-5020.
Start with why the old roof failed
A new flat roof should fix whatever ruined the old one. The usual culprits are standing water, failed flashing at walls and curbs, and seams that opened up. If water ponded because the deck sagged or a drain sat too high, a new membrane over the same low spot will wear out the same way.
Flat roofs aren’t truly flat. They need a slight fall toward drains, scuppers or gutters, and a quarter inch per foot is the common minimum. If your roof doesn’t have that, the fix gets built into the new roof with tapered insulation, a cricket that steers water around a chimney or curb, or an added drain.
Tear-off or recover?
A recover means putting a new membrane over the old roof. It can save on tear-off and disposal, but it only works when the existing roof is dry, firmly attached and usually a single layer. Building codes generally limit how many layers a roof can have.
A tear-off takes the roof down to the deck. It costs more up front, but you get to see the deck, replace rotted or rusted sections and start fresh with new insulation. If moisture testing finds wet insulation across much of the roof, tear-off is the right call. Trapping wet insulation under a new membrane leads to blisters, rot and a shorter life.
Picking the membrane
Three systems cover most homes and small buildings around Kansas City.
TPO is a white single-ply sheet with heat-welded seams. It reflects summer sun, which helps when there are rooms or offices right under the roof. See TPO roofing in Kansas City.
EPDM is black synthetic rubber in wide sheets with taped seams. It stays flexible in the cold and needs few seams on a small roof. See EPDM roofing in Kansas City.
Modified bitumen comes in rolls of polymer-modified asphalt, often two layers with a granule-surfaced cap sheet. It’s tough underfoot and has a long history on low-slope roofs.
The deck, the drainage, any rooftop equipment and how much foot traffic the roof sees all point toward the right one. You’ll hear our recommendation and the reasons behind it, and you make the choice.
What goes under the membrane
On most flat roofs, insulation boards sit between the deck and the membrane. They hold heat in through a Kansas City winter and keep it out in July, and tapered boards can add slope. A cover board on top gives the membrane a smooth, firm base and helps it stand up to hail and foot traffic.
How it’s all held down matters too. A membrane can be fully adhered, mechanically fastened or held down with ballast. The deck type, the building’s height and how exposed it is to wind steer that choice. Corners and edges take the most wind uplift, so those areas get extra fastening.
Edges, walls and transitions
Most flat roof leaks start at the edges, not in the middle. A good install pays close attention to:
- Metal edge trim that clamps the membrane and sends water into the gutter
- Wall flashing run up the wall, secured with a termination bar and covered by counterflashing
- The spot where a flat section meets a shingled roof, with the shingles lapping over the membrane so water runs onto it, never behind it
- Pipe boots, curbs and drains flashed into the membrane rather than sealed with caulk
Planning a flat roof installation in Kansas City, MO around the weather
Adhesives, primers and some membranes have minimum temperatures for a good bond, and the deck has to be dry. In winter that narrows the window, and spring and fall bring their own storms. A good schedule plans around the forecast instead of rushing a job into a cold, wet week.
Hail is the other local factor. A cover board under the membrane and a thicker membrane both help a flat roof shrug off hail that would puncture a thin system laid over soft insulation.
How it works with APC Roofing
- Book your free estimate. Call 913-398-5020 or request one online.
- Get a clear, honest assessment and estimate. We check the deck, drainage, insulation and edges, and you get photos plus a written estimate that spells out what the job includes. If a repair will buy you years, we’ll tell you. Financing is available through Aqua Finance, Fortifi, Hearth and Home Run Finance.
- Your new roof goes on and the site gets cleaned up.
Holding off on a flat roof that’s past repair rarely saves money. Every season of leaks soaks more insulation and wood, and all of it gets added to the eventual job.
Flat roof installation questions
How long does a flat roof installation take?
A small residential flat roof is often a short job. Bigger roofs, full tear-offs and deck repairs add time, and the weather sets the schedule. You’ll get a realistic timeline with your estimate.
Can a new flat roof go over my old one?
Sometimes. The old roof has to be dry, well attached and usually a single layer. A moisture check settles it.
Which flat roof material is best for Kansas City?
TPO, EPDM and modified bitumen all work here. TPO suits roofs where summer heat matters, EPDM handles cold and movement well, and modified bitumen is tough under foot traffic.
Do you install flat roofs on commercial buildings?
Yes, on light commercial buildings as well as homes.
Plan your new flat roof
Call 913-398-5020 or book your free estimate online. Not sure the roof needs replacing? Start with flat roof repair in Kansas City, or see all our flat roofing services in Kansas City.
Done well, a new flat roof drains, stays sealed at the edges and gets through Kansas City winters without a fight. No buckets, and no patch job every spring.
