MCA Establishes Metal Flashing Test Standard
According to field studies of storm-damaged buildings, metal roofing failures are typically the result of flashing failures.
Chicago, IL – 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.
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.
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 benefit tremendously 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 in
construction by educating the building and design communities about the
benefits of metal. For more information about MCA, visit www.metalconstruction.org.