The black rubber roof over your garage or back porch has started to look tired. The edges are pulling away from the wall, a seam is curling up, or there’s a drip inside after the snow melts. You’re looking up EPDM roofing in the Denver metro because you want to know whether this roof can be fixed or whether it’s time for a new one.

It’s hard to judge a low roof you can barely see from the yard. Some people will tell you to replace it on the first visit, and others will smear on a can of something that makes it worse. You deserve a straight answer from someone who knows how rubber roofs behave.

APC Roofing is a GAF Certified contractor, licensed and insured, and your inspection and estimate are free. Call 720-902-6940 and a roofer will walk the membrane, check the seams and edges, and tell you plainly what you’re dealing with.

Is your flat roof actually EPDM?

Flat and low-slope roofs on homes and small buildings are usually one of a few types, and each one gets repaired differently.

EPDM is a synthetic rubber sheet, almost always black. It feels a bit like an inner tube, it often has a dull, chalky surface after a few years in the sun, and its seams are joined with a wide strip of tape or adhesive.

TPO looks similar in shape but is usually white or light gray, with seams that are heat-welded rather than taped.

Modified bitumen and older built-up roofs are asphalt-based. They have a rough, granule-covered or gravel surface and often look like oversized rolled shingles. Many older homes and buildings around Denver still have one of these on a porch or addition.

Knowing which one you have matters, because the wrong patch material can damage the roof you’re trying to fix.

How EPDM ages in the Denver climate

EPDM handles cold very well. It stays flexible in a January freeze, which is one reason it’s been used on Colorado roofs for decades. The wear it does show here tends to follow a pattern.

Shrinkage at the edges. Over years of sun and temperature swings, EPDM can shrink slightly. Where the membrane turns up a wall or over an edge, that shrinkage pulls it tight, and you may see it lifting off the wall or stretched across the corner like a drum. Eventually it pulls loose or tears.

Seams letting go. The tape or adhesive at the seams is often the first thing to fail, especially on roofs where the seams were installed dirty or damp. A curled seam edge lets water run under the sheet.

Sun and hail. Strong high-altitude UV dries out the surface over time. An aging membrane that’s lost some stretch is easier for hail to bruise or puncture, and those holes are small enough to miss from a ladder.

Snowmelt that can’t drain. Snow sitting on a flat roof melts by day and refreezes at night. If the drain or scupper is iced over, the meltwater backs up and finds the weakest seam.

Repairing an EPDM roof the right way

A lot of EPDM leaks can be fixed without a new roof. The work just has to be done with materials that bond to rubber.

The repair area is cleaned and primed so the patch can grip. Then a cured EPDM patch or seam tape goes over a puncture or a lifted seam and is rolled down firmly. Pipes, corners and odd shapes get flexible uncured flashing that stretches to fit. Edges pulling off a wall can often be re-secured and flashed.

One thing to avoid: asphalt roof cement and tar don’t belong on EPDM. They don’t bond well to rubber and can soften it, so a quick fix with a bucket of tar often makes the next repair harder.

If your roof needs this kind of work, our flat roof repair in the Denver metro page covers how we track down the leak.

When a new EPDM roof makes more sense

Repairs stop being the good deal when the membrane has shrunk and split in several places, seams are failing across the whole roof, or the insulation underneath is soaked. Wet insulation is the one to watch. It keeps the deck damp under a sealed membrane, and no patch on top will dry it out.

Replacing an old asphalt flat roof with EPDM is common too. Often the old layers come off so the deck can be checked. In some cases a new membrane can go over one existing roof with a cover board in between, but only if the roof below is dry and there’s just one layer.

A new EPDM roof on a home is usually fully adhered, meaning the sheet is glued down across the whole surface, with as few seams as possible. Good edge metal, proper flashing at every pipe and a clear path for water to reach the drain matter as much as the rubber itself. You can read more about EPDM as a material on our Denver EPDM roofing page.

How it works

1. Book your free inspection. Call 720-902-6940 or request a free estimate online.
2. Get a clear, honest assessment and estimate. We identify the roof type, check every seam, edge and penetration, test for moisture if there’s a leak, and give you photos with a written estimate for repair or replacement. Financing is available through Aqua Finance, Fortifi, Hearth and Home Run Finance.
3. Your roof gets done and the site gets cleaned up. Membrane work needs dry weather, so the job is scheduled around the forecast, and the crew cleans up before leaving.

A lifted seam left through one more winter can let snowmelt soak the insulation below. A small repair in the fall is a lot easier on your budget than a wet roof in the spring.

EPDM roofing in the Denver metro: common questions

Can an old rubber roof be patched?

Usually, yes, if the membrane is still flexible and the insulation is dry. A properly primed patch bonds well to older EPDM.

Why is my rubber roof pulling away from the wall?

That’s usually shrinkage. As EPDM ages it tightens, and the flashing at walls and edges takes the strain. It can often be re-secured if it’s caught before it tears.

Is EPDM a good replacement for an old tar-and-gravel or bitumen roof?

Yes, for most porches, garages and additions. It’s light, handles cold well and is easy to repair later.

Does a black EPDM roof get too hot?

It absorbs more heat than a white roof, which can help snow melt off in winter. If the room below runs hot in summer, a white TPO roof may be worth comparing.

Get your EPDM roof checked

Call 720-902-6940 or book online. For bigger low-slope roofs, see our Denver metro commercial roofing page.

The goal is a low roof you can stop thinking about, with a dry ceiling under it and no surprise bill when the next snow melts.