Скачать или смотреть Tech Tips - Metal Roofing and Lightning

When a metal roof is used on a project, it seems to heighten people’s awareness of lightning, and some question whether or not the use of metal roofing increases the risk of lightning strike.

The probabilities of a strike to a metal roofed structure are no more or less than any other kind of structure. The probability of a strike is based upon the buildings height, geographic location and surroundings.

The threats of a strike are not affected by the construction materials used both framing and roof coverings. If these materials are (electrically) conductive, the threat of fire and explosion are both reduced as the materials are non-combustible.

Because metal roofing is both an electrical conductor and a non-combustible material, the risks associated with its use and behavior during a lightning event make it the most desirable roofing material available.

To minimize risks associated with damage from a lightning strike, the use of additional lightning protection systems may be considered and the building should be properly grounded.