The porch roof drips onto the steps every time it rains. Or there’s a puddle on the garage roof that’s still sitting there three days after the storm, and the ceiling under it has started to sag a little. Flat roofing in Shawnee, KS has a reputation for being trouble, and you’re trying to work out whether this one needs a patch, a new membrane or something you haven’t heard of yet.
You’re not wrong to be cautious. Flat roofs are less familiar than shingle roofs, the terms are confusing, and it’s hard to judge a quote when you can’t see the roof. You should get a clear picture of what’s up there before anyone asks you to choose.
APC Roofing works on flat and low-slope roofs for homes and small commercial buildings from our office right here in Shawnee. We’re GAF Certified, licensed and insured, and your inspection is free. Call 913-398-5020 to set up a visit.
A flat roof isn’t really flat
A well-built flat roof has a slight slope, usually around a quarter inch per foot, so water drains toward an edge, a gutter or a drain. That’s too shallow for shingles, which need a much steeper pitch to shed water. On a low slope, rain driven by wind backs up under the shingle laps and soaks the deck.
So anything under that pitch needs a membrane, one continuous waterproof sheet with sealed seams. On Shawnee homes, that usually means a porch or carport roof, a garage, a sunroom or an addition tied into the main house. Plenty of shops, offices and small retail buildings around town are flat from end to end.
Flat roofing options in Shawnee
You’ll mostly hear about three kinds of membrane.
TPO
A white single-ply membrane with seams melted together by hot air. The white surface reflects a lot of summer sun, which helps rooms underneath stay cooler. Our TPO roofing in Shawnee page covers it in detail.
EPDM
A black synthetic rubber membrane with seams bonded by primer and tape. It stays flexible in cold weather and has a long track record on low roofs. See EPDM roofing in the Kansas City area for more.
Built-up and modified bitumen
Layered asphalt systems, older and heavier, still common on some commercial buildings. They’re repaired with matching materials or replaced with a single-ply membrane when they wear out.
The right choice depends on the framing, the drainage and what’s going on underneath, like whether the room below is heated living space. You’ll hear our recommendation and the reason for it, and you decide.
What Kansas City weather does to a flat roof
A low roof sees more water contact than a steep one, because rain leaves it slowly. In the Kansas City area, that slow drainage meets a few local problems.
Water that ponds in a low spot can freeze overnight in winter and work at the nearest seam. Fall leaves from nearby trees collect at the edge and clog drains and gutters, which leads to more ponding. Spring hail can bruise or crack a membrane, especially an older one that’s lost some flexibility. And summer sun heats a dark roof surface far past the air temperature, so the membrane expands and shrinks every day.
Repair, recover or replace?
Repair is right when the trouble is in one spot: a split seam, a puncture, a failed flashing at the wall. Our flat roof repair in Shawnee page walks through how leaks get found and fixed.
Recover means a new membrane over the old roof, with a separator board between them. Building codes generally allow that only when there’s one roof layer already and the insulation underneath is dry.
Replace means tearing off down to the deck, replacing soft wood, fixing the slope and installing new insulation and membrane. It’s the right answer when the old roof has failed widely or the insulation is wet. Our flat roof installation in Shawnee page explains what goes into a new flat roof.
Signs your flat roof needs a look
- Water still standing on the roof 48 hours after rain
- Blisters, bubbles or wrinkles you can see from an upstairs window
- Seams curling up at the edges or corners
- Stains on the ceiling under the porch or addition, often near where it meets the house
- Edge metal bent or lifted after a windstorm
How it works
- Book your free inspection. Call 913-398-5020 or request a free estimate online.
- Get a clear, honest assessment and estimate. We check the drainage, seams, flashing and edges, look for wet insulation where there’s a leak and give you photos and a written estimate.
- The work gets done and the site gets cleaned up. Old material and scraps leave with the crew.
Flat roof leaks tend to be slow and quiet. Water can sit in the insulation for months before it shows on a ceiling, and by then a seam repair may have become a section of new deck.
Flat roofing questions
Can a new flat roof go over the old one?
Sometimes. If there’s only one existing layer and the insulation is dry, a recover can work. If there are already two layers or the insulation is wet, a tear-off is needed.
Why does my porch roof leak where it meets the house?
That joint, called the tie-in, is one of the most common leak spots. The membrane has to run up and under the siding or the shingles above it. When it’s lapped the wrong way, water runs straight into the wall.
Do you work on flat roofs for businesses?
Yes. For shops, offices and other commercial buildings, see our commercial roofing in Shawnee page.
Do you serve Lenexa?
Yes. Lenexa is next door to Shawnee and part of the Kansas City area we serve.
A dry porch and a roof you don’t have to think about
Call 913-398-5020 or book your free inspection online. You’ll know what kind of roof you have, what it needs and what it doesn’t, and the next storm can come and go without a bucket on the porch.
