Metal Roof Edges – What is the ES-1 Standard?

The topic of metal roof edges is one of high importance when it comes to the performance of a low-slope roof. The edge of a low-slope roof is the likely failure of the system in an extreme weather event with high winds. Factory Mutual (FM), a leading building insurance company, attributes 80% or more of all roof failures directly to failure of the roof edge.

For years, the shop-fabricated versus pre-manufactured metal roof edgings debate continued until the adoption of the ANSI/SPRI ES-1 Standard into the International Building Code (IBC). ES-1 is the "Wind Design Standard for Edge Systems Used with Low-Slope Roofing Systems" and is comprised of three pull-off tests, two for fascia and one for coping. They are based on the American Society of Civil Engineers' document ASCE-7 Minimum Design Loads for Buildings and Other Structures.

The main reason for the development of ES-1 was to improve the longevity and safety of low-slope commercial roofs and to protect the building owner’s investment by reducing the risk of edge failure, and consequentially roof failure. Basically, ES-1 provides formulas for calculating the wind load on edges of low-slope roofs and prescribes methodology for testing and evaluating the ability of edge systems to withstand those loads; as a result, this ensures wind resistance and long-term performance.


Versico's prefabricated cleat options ensure you meet building code and have the right cleat for long term performance.Click here to download Versico's SureTite Prefabricated Cleat Sell Sheet for more information.


Contact Craig Tyler at [email protected] with further questions.

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