Steel Roofs And Lightning

Nor do metal roofs protect a building against lightning.

Steel roofs and lightning.

Metal roofing materials are non combustible so if a metal roof does get struck by lightning it is less likely to result in a fire than some other types of roofing materials such as cedar shakes. However even if metal is a great conductor of electricity it isn t a lightning magnet. It s understandable many homeowners believe metal roofing s steel tin or aluminum body can attract lightning. Decra stone coated steel is the only roofing material that adds shear strength to the roof to endure the forces of lightning shock waves as well as the high winds and hail which accompany thunderstorms.

The only way to protect a building is with a properly designed and installed lightning protection system lps. In truth high or thin points or structures that cover wide ground regardless whether they contain metal or not attract lightning. While a building s structural steel will conduct lightning it is the bonding interconnection and grounding provided by a lightning protection system lps that will dissipate lightning s harmful electricity safely to the ground. Fractured materials can generate dangerous shrapnel and it s not uncommon to find fragments embedded in walls after a lightning strike.

Metal roofs do not attract lightning strikes. A metal building system with a conductive metal roof and a conductive metal structural frame gives lightning a low resistance path to the earth. Then the metal s fire resistant properties will protect your building even further. Metal roofs are no more attractive to lightning than any other type of roofing material.

The misconception that metal roofs attract lightning is probably because metal itself is known as a good conductor of electricity and people therefore assume that a metal roof must attract lightning. Steel roofing materials are no more attractive to lightning than any other type of roofing material according to the metal roofing wholesalers website. It has been observed that installing a metal roof makes building owners think more about lightning and the dangers of lightning strikes. In reality when lightning strikes it is seeking a path to ground and almost always will strike whatever object is highest in the area that also has a direct path to ground.

The metal construction association notes that metal roofs do not attract lightning. Fire is the most destructive element of a lightning strike because most roofs will immediately combust.