Skip to main content
Add as a preferred source on Google

What Causes a Flat Roof to Leak?

  • 03/01/17

Many campus buildings feature flat roofing. Because there is no pitch, these systems rely heavily on a combination of product quality, membranes and initial installation. Some reasons your flat roofs may develop leaks include:

Clogged Drainage
A flat roof relies on a drainage system to remove rain water. If the drainage system is clogged, water will pond on your roof. Ponding water eventually leads to excess strain on the roof, and inevitably the water will start to seep inside.

Damage to the Perimeter Flashing
Flashing is installed on the edges of the rooftop as well as the interior parapets to protect the roof’s membrane. Moisture and water can seep underneath this flashing and into the building if it is not installed correctly, or becomes damaged.

Open Penetrations
Penetrations are common on rooftops, including as drains and pipes. When these are not installed properly, they leave a roof prone to leaks. They should be kept watertight with flashing, wraps, rain collars and pitch pans.

Damage to the Membrane
When a roof’s membrane becomes damaged, it allows water to enter through the opening. Membranes can become damaged for a variety of reasons. Sometimes it is just a matter of age.

The Age of Your Roof
Flat roofing in areas that experience hot summers or harsh winters will eventually start to fail due to age. Most systems deteriorate at about 15 to 20 years post-installation.

This article originally appeared in the issue of .

Featured

  • Can AI Help Build Stronger Communities in Student Housing?

    Student housing success is shifting from operational performance to student experience, with belonging now at the center. A recent 2025 report underscores a growing emphasis on student well-being, community, and engagement, signaling that expectations now extend beyond logistics to ensure students feel supported in their living environments. AI is enabling that shift by reducing administrative workload and giving teams more time to focus on meaningful student engagement.

  • Vanderbilt to Partner with ABM for Campus Preservation and Modernization

    Vanderbilt University recently announced that it has selected ABM Performance Solutions for a preservation and modernization project at its New York City campus, according to a news release. ABM will deliver its end-to-end ABM Performance Solutions (APS) model to manage critical operations during renovation and maintenance.

  • Campus Safety Requires Using Every Resource Available

    Across the U.S., school and campus leaders are facing a security landscape that has changed dramatically over the past decade. Incidents on school property have increased in recent years, with several consecutive years setting record totals. According to analysis of data by CNN, dozens of shootings now occur on school grounds annually across K-12 and higher education environments.

  • Cal Poly Humboldt Starts Construction on Healthcare Education Hub

    California State Polytechnic University, Humboldt in Arcata, Calif., recently announced that work has begun on a renovation project that will turn the Stewart Building into a new Healthcare Education Hub, according to a news release. The university is partnering with Sundt Construction Inc. for construction services.