I understand that they attract lightening so that something else doesn’t get hit. I get that part. But, how does all of the lightening energy still not hurt the roof via the rod?
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There is a continuous path of low resistance provided from the lightning rod down to the ground. This gives the electricity a path that it will prefer over actually going into any building components.
I smaller buildings this is basically a large copper wire down to ground, in a skyscraper this might be a continuous path of steel columns/welded reinforcement that goes to the foundations.
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