A metal building system, with a conductive metal roof and a conductive metal structural frame, gives lightning a low-resistance path to the earth. The short answer is, no, a metal roof will not make lightning more likely to strike, but it may make a lightning strike less dangerous if it occurs.Click to see full answer. People also ask, does a metal roof attract lightning?The concern about metal roofs attracting lightning strikes is most likely associated with the fact that metal can be an electrical conductor. Even so, metal roofs do not attract lightning and are not struck any more frequently than other roofing materials. Lightning is attracted to: High points.Likewise, what are the disadvantages of a metal roof? Disadvantages of metal roofs Affordability. Metal roofs can be as much as two or three times more expensive than other roofing materials. Noisiness. Metal roofs can be noisy, especially during a heavy rain or hailstorm. Expansion and contraction. Inconsistency of color match. Performance. Subsequently, one may also ask, should metal roofs be grounded? The short answer is no, you don’t have to ground a metal roof, and you will incur no additional risk if you don’t ground it in most circumstances.Does a metal roof go over existing shingles?Metal roofs can be installed over your existing roof without tearing off shingles, provided local building codes allow it. Or, installing the new metal roofing over furring strips (1 x 3s or similar) will raise the metal and provide a ventilating air pocket between layers.