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Cape Cod Flat & Rubber (EPDM) Roofing
Flat & Rubber (EPDM) Roofing on Cape Cod
Flat and low-slope roofs need a completely different approach than shingles. We install EPDM rubber and membrane systems that stay watertight on Cape Cod additions, porches, dormers, and modern flat roofs.
Low-slope roofs don't shed water the way a steep roof does — they hold it. That's why they need a seamless, fully sealed membrane, not shingles.
EPDM (a durable synthetic rubber) and related membrane systems are the right tool for flat and low-pitch areas: rear additions, porch and sunroom roofs, dormer tops, and modern flat-roofed homes. Installed correctly — with proper seams, flashing, and drainage — a rubber roof stays dry for decades. Installed carelessly, it ponds water and leaks at the seams. The details are everything.
What's included
- EPDM rubber membrane roofing for flat and low-slope areas
- Fully sealed seams and detailed flashing at walls and penetrations
- Proper drainage detailing to prevent ponding water
- Membrane options for additions, porches, dormers, and sunrooms
- Tear-off and replacement of failed or leaking flat roofs
- Coordination where a flat section meets a shingle or metal roof
- Repairs to existing rubber and membrane roofs
Who it's for
- Homes with a flat or low-slope addition, porch, or sunroom
- Owners with a leaking or ponding rubber roof
- Modern and contemporary Cape homes with flat roof sections
- Anyone whose 'roof leak' is actually a failing low-slope area
Why it matters on Cape Cod
Flat roofs are unforgiving anywhere, and the Cape adds its own stresses: standing water from heavy coastal rain, wind that can peel a poorly adhered membrane, and freeze-thaw cycles that punish any weak seam. A membrane that isn't properly adhered, seamed, and flashed will find a way to leak — usually at the wall transitions and around penetrations.
Many 'mystery leaks' on Cape homes trace back to a tired flat section over an addition or porch, not the main roof at all. Getting the low-slope areas right — with correct slope to drainage and watertight detailing — is often the fix people have been chasing for years.
Repair or replace a flat roof?
If a rubber roof is relatively young and the problem is a specific seam or flashing, a targeted repair can work. If it's aged, brittle, or ponding across the field, replacement is the durable answer. We'll inspect it and tell you honestly which makes sense. For active leaks, see our storm & leak repair service.
Frequently Asked Questions
How long does an EPDM rubber roof last?
A properly installed EPDM roof commonly lasts 20–30 years. Lifespan depends heavily on installation quality — especially seams, flashing, and drainage — and on avoiding ponding water. Good detailing is what makes a rubber roof go the distance.
Why does my flat roof keep leaking?
Flat-roof leaks almost always come from seams, flashing at walls and penetrations, or ponding water that sits until it works through a weak point. A repair that only patches the surface without addressing the real detail won't hold. We trace it to the cause.
Can you put a rubber roof over my old flat roof?
Sometimes, but on the Cape we usually recommend tearing off a failed membrane so we can inspect the deck, correct the slope toward drainage, and start with a clean, properly adhered surface. We'll advise based on what we find.
Is a flat roof a good idea in a snowy, coastal climate?
Low-slope roofs work fine here when they're built and drained correctly — many Cape additions and porches have them. The key is proper slope to drainage, a quality membrane, and watertight flashing so snowmelt and coastal rain move off rather than pooling.
Ready for a straight answer on your roof?
Free inspections and written estimates across all 15 Cape Cod towns.