Metal roofing systems of all types have proven to perform well in high winds. Properly detailed and installed, metal roofing typically withstands the forces of nature better than most traditional roof systems.
However, when a roof failure does occur, research shows that flashing failure can contribute to the event. In response, the Metal Construction Association (MCA) launched an initiative to create this new standard.
The locations of these flashings are also where the highest wind uplift pressures occur, so it's critical that they're designed, manufactured and installed to resist those higher wind pressures
MCA will be proposing that testing metal roof flashings per this standard be included in the next version of the International Building Code (IBC) in 2024. Meanwhile, the standard is available to specifiers and manufacturers of metal roof systems to assure proper performance of the edge flashings with metal roof systems and assemblies.
Hundreds of roof failures due to high winds have been investigated. These include hurricanes Charley, Ivan, Katrina, Ike and Irma. In every one of the these reports you will find that metal flashing failures are cited as a leading cause of roofing system failures.Bob LeClare, Director of Perimeter Edge Metal Business for ATAS International.