Do Rubber Roofs Leak?

Yes, rubber roofs like EPDM can leak—but usually not because the material fails. Most leaks stem from installation issues, degraded seams, ponding water, or damage from debris. A properly installed and maintained EPDM membrane typically lasts 20–30 years and resists UV and weather.

Why Rubber Roofs Leak

1. Poor Installation

Most leaks happen at the seams or edges. If the installer didn’t clean the deck, prep the flashing, or bond seams correctly, water finds a way in

2. Shrinkage

Over time, the rubber membrane can shrink, pulling away from parapet walls, flashing, drains, and leaving gaps that let water sneak under.

3. Punctures and Tears

Sharp debris, winds, even foot traffic can damage the membrane if it's not thick or reinforced.

4. Ponding Water

Flat roofs that don’t drain properly let water collect, which breaks down adhesives and speeds up material fatigue .

5. Flashing Failures

Areas around walls, vents, drains require precise flashing. Poor detailing here leads to leaks—even when the main membrane is intact.

When Rubber Roofs Actually Hold

• Well-installed EPDM lasts decades: Typically 20–25 years, even up to 30–50 with ideal conditions.

• Durable against weather and UV: Especially with fleece-backed versions, tear resistance improves dramatically.

• Repairable materials: Tears and seam issues can be patched quickly with EPDM, compatible sealants and tapes.

• Energy benefits: EPDM reflects UV and resists heat transfer, reducing roof fatigue and lowering cooling costs .

What Happens If You Ignore Leaks

If small leaks or ponding are left unaddressed, expect:

• Wet insulation, destroyed R‑value

• Mold and mildew risks

• Rotting deck or framing

• Cracked plaster, water stains, sagging ceilings

Water migration under the membrane spreads quickly. A small puncture becomes structural damage fast on a flat roof.

How to Keep Your Rubber Roof Leak‑Free

• Schedule inspections twice yearly and after storm events

• Check seams, flashing, edges, drains, it’s where most issues start

• Address shrinkage before gaps form

• Repair punctures with proper sealants or patches

• Ensure proper drainage—add crickets or drains if needed

• Clean debris regularly and inspect flashing details

Rubber roofs can leak—but only when installation is poor, seams fail, or maintenance is neglected. A well-installed EPDM roof, especially one that's fleece-backed and properly detailed, will resist leaks for decades and offers real value. Quick repairs, proper drainage, and regular inspections are what keep it watertight.

Need Help With Your Rubber Roof in Philadelphia?

If your rubber roof is leaking, contact local pros familiar with Philly’s homes and flat roof challenges. Get inspections, repairs, or replacements done right, no guesswork.

📞 Call McGrath Roofing at (215) 317‑9291

📍 4540 Carwithan St, Philadelphia, PA 19136

Protect your roof before a small leak becomes a big problem.

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