3 Common Causes of Commercial Roofing Leaks

Contrary to popular belief, commercial roofing leaks are rarely random. They usually trace back to a few repeat offenders that show up again and again on flat and low-slope roofs. At Watergate Roofing, we help property owners get ahead of leaks with practical fixes, smart maintenance, and inspections that catch small issues before they turn into major disruptions. Here are the three most common causes of commercial roofing leaks we encounter.

1. Flashing Failures Around Roof Penetrations

Most commercial roofs aren’t one smooth surface. They’re full of penetrations, such as HVAC curbs, vents, pipes, drains, and skylights. The seams and flashing around these areas are supposed to act like waterproof armor, but they can loosen, crack, or pull away over time due to temperature swings, vibration, and normal aging.

To prevent leaks, prioritize routine checks around penetrations, especially after HVAC work. Even careful contractors can disturb flashing. A proactive inspection can spot lifted edges, shrinking sealant, or gaps before water starts traveling under the membrane.

2. Drainage Problems and Ponding Water

Flat roofs are designed to drain, not to hold water. When drains clog with leaves, debris, or roofing granules, water can pond and sit for days. That standing water adds weight, speeds up material breakdown, and finds the smallest imperfections in seams or coatings.

Therefore, you should keep drains and scuppers clear year-round, and pay attention to areas where puddles linger. If you notice recurring ponding, the solution may involve improving the slope, adjusting the drains, or targeted repairs to prevent long-term damage.

3. Membrane Damage From Foot Traffic and Weather

Commercial roofs take a beating. Technicians walk them. Equipment gets dragged. Wind-blown debris scrapes them. Hail can bruise or puncture surfaces. Over time, membranes can split, seams can separate, and protective coatings can wear thin, leaving the roof vulnerable.

To prevent all this, create designated walk paths and require service vendors to use them. After severe storms, schedule an inspection to identify punctures or seam issues early, when repairs are simpler and less costly.

Keep Leaks Out and Operations Moving

Leaks don’t just damage buildings; they disrupt businesses. If you manage property anywhere in the greater Indianapolis area, Watergate Roofing can help with commercial roof maintenance and inspections designed to extend roof life and reduce surprise repairs. Request an estimate with our team today at (317) 807-6637.