The black rubber roof over your porch or garage has done its job for years. Lately, though, a seam is curling up at one corner, the membrane looks tight and stretched where it meets the wall, and there’s a damp spot inside after hard rain. With EPDM roofing in the Missouri Ozarks, small problems like that are usually fixable, as long as someone catches them before the water reaches the insulation.
The hard part is knowing whether you need a patch or a new roof, and trusting the answer you get. You shouldn’t have to guess.
APC Roofing repairs and installs EPDM rubber roofs on homes, shops and small commercial buildings across southwest Missouri. We’re GAF Certified, licensed and insured, and your inspection and estimate are free. Call 913-398-5020.
What EPDM is
EPDM is a synthetic rubber membrane, usually black, that comes in wide sheets. On a house you’ll most often find it over a porch, a low addition, a garage or a carport. On commercial buildings it can cover the whole roof.
The sheets are joined at the laps with primer and seam tape or adhesive, not melted together the way TPO is. The edges are held by metal trim, and the membrane turns up walls and curbs and is covered with flashing. When an EPDM roof leaks, the problem is almost always at one of those joints or edges, not out in the open field of the sheet.
EPDM roofing in the Missouri Ozarks: what the weather does to it
EPDM handles cold well. It stays flexible below freezing, which is one reason it’s been used on low roofs in Missouri for decades. Winter still finds the weak spots. Freeze-thaw works water into tired seams, and ice storms can load the roof edge and gutters with weight.
Spring storms are the bigger test. Hail can bruise or split older rubber that’s lost its stretch, and strong wind gets under any loose edge and tries to lift the sheet. On wooded lots, falling limbs and debris add punctures and clogged drains to the list.
Summer sun ages the surface over time. A black roof absorbs heat, and years of UV leave the surface chalky and fine-cracked. That surface wear isn’t always a leak, but it tells you how far along the membrane is.
Where EPDM roofs leak
- Seams. Older roofs often used liquid adhesive at the laps. As it ages, the lap can open, starting at a corner or a T-joint where three sheets meet.
- Edges and walls. Rubber can shrink slightly over the years. When it does, it pulls on the perimeter and can lift away from the wall or stretch across inside corners, leaving a gap behind it.
- Pipes and vents. The boot or flashing around a plumbing vent or exhaust can crack or come loose.
- Punctures. A dropped tool, a branch, a misplaced ladder or hail can open a small hole that’s easy to miss from the ground.
- Drains. Leaves backing up a drain or scupper leave water sitting on the roof, which finds any weak lap.
EPDM roof repair: what a good one looks like
A lasting patch on a rubber roof depends on prep more than on the patch itself. The area gets cleaned well, because dirt and chalky residue keep primer from bonding. Then it’s primed, and the patch goes on with rounded corners so there’s no square tip for wind or water to catch. Seams get the same care: open laps are cleaned, primed and re-taped, often with a cover strip over the top.
What a repair can’t do is fix wet insulation underneath. If water has been getting in for a while, the insulation and maybe the deck below need attention first, and that changes the answer.
Repair or replace your EPDM roof?
A repair is usually the right move when the leak traces back to one or two spots and the rest of the rubber is still flexible and well attached. If the sheet is shrinking hard at the edges, seams are opening all over, or the insulation is soaked in large areas, replacement is the better use of your money.
When you replace, you can stay with EPDM or switch to TPO roofing, a white membrane with heat-welded seams. Both work in the Ozarks. EPDM’s strengths are cold-weather flexibility and a long track record. TPO reflects more summer sun and its seams are welded instead of taped. You’ll hear the pros and cons for your roof, and you make the call.
For the bigger picture on low roofs, see our flat roofing page for the Ozarks.
Hail and your rubber roof
After a hailstorm, an EPDM roof can look fine from the ladder and still be damaged. Hail can bruise the membrane or crack it at the edges of the impact, and those spots leak later. A close inspection is the only way to know. If you’re filing a claim, you file it with your insurance company and you pay your deductible. We document the damage with photos, write the estimate and work with your adjuster. More on that on our hail damage roof repair page.
How it works with APC Roofing
- Book your free inspection. Call 913-398-5020 or request a free estimate online.
- Get a clear, honest assessment and estimate. You’ll see photos of the seams, edges, flashing and drains, and hear whether a repair will hold or a new roof makes more sense.
- Get the work done and the site cleaned up. Repairs and new roofs go on in the right weather, and the crew cleans up before they leave.
Financing is available through Aqua Finance, Fortifi, Hearth and Home Run Finance.
EPDM roofing questions
Can a rubber roof that’s already been patched be patched again?
Often, yes, if the old patches are still bonded and the membrane around them is sound. A roof covered in patches, or with patches peeling at the edges, is usually telling you it’s near the end.
Why is my rubber roof pulling away from the wall?
That’s usually shrinkage. As EPDM ages it can draw in slightly, and the pull shows up at walls, curbs and inside corners. The fix depends on how far it’s pulled and whether the membrane can be re-secured and flashed.
Is EPDM a good choice for a shop or outbuilding?
It can be, on a low-slope roof. Rubber works well in the cold and is straightforward to repair. On a steeper outbuilding roof, metal is often the better fit.
Can EPDM go over my old flat roof?
Sometimes. It depends on how many layers are already there, whether the insulation is dry and what the local code allows. A moisture check tells you whether going over is an option.
A rubber roof that stays put
The goal is a low roof that stays sealed through winter ice and spring storms, with seams that hold and no water finding its way to your ceiling. Call 913-398-5020 to book your free EPDM roof inspection.
