Do Rooftop AC Units Cause Roof Leaks? (Video)

“Hi, my name is Greg Batista here to answer another question from the internet.

CoolAirCarl asks: Do rooftop AC units cause leaks in buildings?

Yes — they’re a common source of roof problems. Rooftop units sit on curbs, and the flashing around them often cracks or pulls away. Drain lines clog, and water ponds, leading to leaks. The National Roofing Contractors Association estimates that over 35% of commercial roof leaks are linked to rooftop equipment. In South Florida, heavy rains and hurricanes make the problem worse. Regular inspection of curbs, seals, and drains prevents damage, but neglect can lead to major interior flooding and structural deterioration. It’s not the AC itself — it’s the weak points around it that need constant attention.

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Authoritative references: National Roofing Contractors Association; ASHRAE HVAC standards.

The author, Greg Batista, PE, CGC, SI is owner of G. Batista Engineering & Construction and is a nationally-recognized engineer and contractor with more than 35 years of experience and offices in Fort Lauderdale, Florida.