When Wind Pressure Finds Your Weakest Point

You don’t need a Category 5 hurricane to lose a roof system. Most failures occur well before wind speeds reach triple digits—often because of missed details in fastener patterns, edge terminations, or incomplete uplift testing.

The problem isn’t always the install. It’s the assumption that it was done right—and the lack of proof when someone demands it. And in South Florida, it’s not a matter of if that demand comes. It’s when.

Where Failures Usually Start

The most common point of failure is at the edge. That’s where the pressure is greatest, and where even a slight flutter or loose seam can lead to progressive peeling. If the perimeter flashing wasn’t fastened per spec—or the membrane wasn’t fully adhered—it becomes the launch point for the rest of the system to lift.

We’ve reviewed dozens of failure reports where everything looked correct. But on closer inspection, there were inconsistencies in fastener spacing, missed laps, or post-install penetrations that compromised the seal. None of them were caught until the roof was already gone.

Why Testing Isn’t Optional

Uplift testing isn’t just a box to check for the city. It’s a validation step for the installer. A way to prove that the system performs the way it was designed to—under real simulated pressure.

It also provides one of the most valuable things a contractor can carry into storm season: a sealed report. The kind that shifts blame away from your scope when an adjuster or owner starts asking questions.

At PES, we’ve had contractors call us weeks after a storm asking for help defending their work. When we ask for test data, photos, or inspection logs, they have none. Without documentation, there’s nothing to stand on—even if the roof held.

How to Get Ahead of the Blame Game

If you’re installing a roofing or glazing system this season, here’s what we recommend:

• Book uplift testing as soon as your system is ready
  
• Document your install clearly—photos, fastener patterns, edge details
  
• Ask your engineer for a pre-storm letter verifying system compliance
  
• Keep a digital record of everything in one centralized folder 

It’s not about paranoia—it’s about protection. The contractors who plan ahead don’t just reduce risk. They recover faster and earn more respect from their GCs and clients.

PES Insight: If you wait to defend your install until after the damage, you’re already too late. Start proving it now.