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Flat & Rubber Roofs
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- EPDM, TPO & modified bitumen
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Materials
EPDM vs TPO vs modified bitumen
Low-slope roofs need a continuous membrane, not shingles. These are the three you'll be offered most often:
| Feature | EPDM (rubber) | TPO | Modified bitumen |
|---|---|---|---|
| Color | Usually black | Usually white | Gray, black or granulated |
| Seams | Glued or taped | Heat-welded | Torched or self-adhered laps |
| Strengths | Flexible in cold, simple to repair | Reflects summer heat, strong seams | Tough underfoot, multi-layer |
| Watch for | Seam failure with age | Installer skill matters | Torch work near wood |
Any of the three performs well when it's installed correctly, flashed properly at walls and edges, and the roof drains. The installer matters more than the brand.
Warning signs
When a flat roof needs attention
- Water still standing 48 hours after rain
- Blisters, bubbles or wrinkles in the membrane
- Seams lifting or edges pulling away from walls
- Cracking, or membrane shrinking at the corners
- Spongy spots underfoot, meaning wet insulation
- Clogged drains, scuppers or gutters
- Stains on the top-floor ceiling
Maintenance
A simple flat roof maintenance routine
- Spring and fall: clear leaves and debris, and check that every drain and scupper flows.
- After big storms: look for lifted edges, punctures and debris.
- Winter: keep drains open so meltwater can leave. Don't let anyone shovel down to the membrane.
- Every few years: have a roofer check the seams and flashing before small gaps become leaks.
Low-slope roofs fail at the edges and seams long before the field of the membrane wears out. Catching those early is cheap.
Repair or replace?
Patching vs a new membrane
Repair open seams, punctures, a few blisters or a failed flashing detail.
Replace when there's widespread cracking, multiple leaks or wet insulation under the membrane, or when the roof has ponded for years because it doesn't drain.
A replacement can fix chronic ponding with tapered insulation that builds slope toward the drains. Ask about it if water always collects in the same spots.
On a pitched roof instead? See roof replacement or roof repair.
FAQ
Flat roof questions
How flat is a "flat" roof?
Flat roofs aren't perfectly flat. They're low-slope, usually under about 2 inches of rise per foot, which is too shallow for shingles to shed water reliably.
Which is better for a house, EPDM or TPO?
Both work well. EPDM is easy to repair and very common on older homes. TPO's white surface keeps top floors cooler in summer. The quality of the installation and flashing matters more than the choice.
Can a new membrane go over the old one?
Sometimes one recover is allowed, but wet insulation or multiple existing layers mean a tear-off. A roofer can core-test the roof to see what's underneath.
Can I put a deck or patio on my flat roof?
Possibly, with the right membrane, protection layer, structural support and a building permit. Plan it with the roofer before anything is built on top.
Do flat roofs need special care in winter?
Keep drains clear so meltwater can escape, and hire a pro if snow load is a concern. Shovels and ice picks are the fastest way to puncture a membrane.
Local guides
Flat & Rubber Roofs in your city
Some cities have their own page with local housing, permit and neighborhood details.