The #1 Cause of Flat Roof Failure (And How to Prevent It)

Flat roofs are extremely common on commercial buildings, but they come with unique challenges.

One of the biggest causes of roof failure is ponding water.

Water that sits on a roof for more than 48 hours can slowly break down roofing materials and increase the likelihood of leaks.

Ponding usually occurs due to:

• Poor drainage design

• Structural settling

• Blocked roof drains

• Aging roof materials

Over time, standing water can accelerate roof deterioration and damage insulation layers.

Professional roofing contractors can correct ponding issues through:

• Adding drainage improvements

• Applying spray foam to create slope

• Installing protective coating systems

Spray foam roofing is particularly effective because it can build slope and eliminate low spots while creating a seamless waterproof barrier.

For many building owners, correcting drainage issues can add 10–20 years of life to a roof system.