When it comes to commercial roofing and storm preparedness, most conversations center around membrane durability, drainage systems, and structural integrity. However, one of the most overlooked—and most critical—components in protecting a roofing system during high-wind events is edge metal.
As hurricane season quickly approaches, it’s crucial to understand why edge metal should never be an afterthought in your roofing system.
What Is Edge Metal?
Edge metal refers to the metal flashing systems installed along the perimeter of a roof. This includes fascia, coping, gravel stops, and other terminations that secure the roof membrane and protect against water infiltration and wind uplift.
In high-wind scenarios, the edge of the roof becomes the point of greatest aerodynamic pressure. If the edge metal fails—whether due to poor installation, corrosion, or design flaws—it can allow wind to get underneath the membrane, resulting in catastrophic blow-offs.
ANSI/SPRI ES-1 Compliance: Why It Matters
The ANSI/SPRI ES-1 standard sets engineering and performance criteria for edge systems to withstand wind uplift forces. ES-1-compliant edge metal isn’t just a best practice—it’s required by the International Building Code (IBC) for low-slope commercial roofs.
ES-1 testing evaluates:
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Pull-off resistance (ensuring the edge stays attached during wind events)
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Securement strength at the face and horizontal leg of the edge metal
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Durability under simulated wind conditions
Failing to meet ES-1 standards could void roofing warranties and leave a building vulnerable to storm damage and costly insurance claims.
Common Edge Metal Failures in Storms
From our experience in post-storm assessments, we often see:
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Loose or poorly fastened coping caps
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Rusted or deteriorated fascia flashing
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Non-compliant systems installed during re-roofs or retrofits
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Membrane detachment beginning at unsecured perimeters
These issues are especially prevalent in aging buildings or those with multiple roofing layers.
CP Rankin’s Approach to Perimeter Defense
At CP Rankin, we don’t just “check the box” on edge metal installation—we build defense into every detail. Our team ensures:
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Use of ANSI/SPRI ES-1-compliant materials
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Secure fastening with appropriate substrate anchoring
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Detailed inspection of transitions, corners, and joints
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Comprehensive weatherproofing to prevent moisture intrusion
We also offer retrofit solutions for existing buildings that may not meet current standards—without requiring a full roof replacement.
Final Thoughts
Hurricane-force winds don’t look for weak points—they create them. But when it comes to your roofing system, the edge metal is already a natural vulnerability. Proactively addressing this detail could mean the difference between weathering the storm or facing extensive roof failure.
If you’re unsure about your roof’s perimeter condition or compliance, contact CP Rankin. Let’s reinforce the edge—before the storm does.