MCA Updates Bulletin About Lightning Strikes And Metal Roofing

Chicago, IL - Lightning Safety Awareness Week lasts just seven days, but lightning strikes are a serious concern no matter what time of year they occur. The Metal Construction Association (MCA) addresses misconceptions about an association between metal roofs and lightning in a newly updated technical bulletin, "Lightning Strikes and Metal Roofs", downloadable at www.metalconstruction.org.

"Research shows that the material used in roof construction does not influence the risk of a lightning strike," says Karl Hielscher, MCA's executive director. "In fact, the presence of a metal roof really shouldn't statistically increase or decrease the chances of a lightning strike. There are many other factors that influence the actual chance of a lightning strike."

Factors that do affect the risk of lightning striking a building include the topography on which the building sits, the height and size of the building, and the frequency and severity of storms in the area. The material used to construct the roof is not a significant factor in determining where lightning will strike.

"Metal roofs do not attract lightning, nor do metal roofs protect buildings against it," Hielscher clarifies.

What happens when lightning strikes a building? If construction materials are electrically conductive, the electrical charge will pass through these materials and not build up heat through material resistance. The threat of fire and explosion are both reduced, thus reducing the threat to human life. Furthermore, if the construction materials are noncombustible, such as a metal roof, the threat of damage due to fire is reduced.

NFPA 780 is a standard that provides information on the materials and installation of lightning protection systems used to safeguard people and property from fire risk and related hazards associated with lightning exposure.

"As a noncombustible material, a metal roof may even be a more desirable construction option," Hielscher concludes.

About The Metal Construction Association

Founded in 1983, MCA represents over 100 member companies that manufacture and distribute products for the metal construction industry. The association’s mission is to promote the use of metal in the building envelope. Member volunteers collaborate on projects to educate contractors and architects about best practices for metal design and installation, while also ensuring compliance with evolving building codes and standards that support safety, sustainability, and performance. Companies involved in MCA benefit greatly from activities focused on research, codes and standards, market development, and technical programs. For more information, visit www.metalconstruction.org.