The Metal Construction Association (MCA) has released a new standard for testing the performance of metal flashings used with metal roofing systems. The standard, ANSI/MCA FTS-1-2019, “Test Method for Wind Load Resistance of Flashings Used with Metal Roof Systems” is available now on MCA’s website, www.metalconstruction.org.
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.
"Hundreds of roof failures due to high winds have been investigated," says Bob LeClare, Director of Perimeter Edge Metal Business for ATAS International. "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."
Flashings are fabricated sheets of aluminum, copper, steel, zinc or other metals used to help weatherproof a building. For low slope roofing, flashings are at the perimeter of the roof; on steep slope roofs they're at eaves, gables, hips, and ridges.
"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," says LeClare.
The standard consists of four key sections: Test Apparatus, Test Specimen, Loading Procedure and Test Report. 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.
Examples of Metal Flashing Failures:
About the Metal Construction Association
The Metal Construction Association brings together a diverse industry for the purpose of expanding the use of metal in construction through marketing, research, technology and education. Companies involved in MCA gain tremendous benefit from association activities that focus on research, codes and standards, market development, and technical programs. MCA’s market development efforts increase the use of metal materials in construction through the education of the building and design communities about the benefits of metal. For more information visit: www.metalconstruction.org.