Metal is extended-lasting and is not vulnerable to damage because of insects/pests. On top of that, it provides good security from severe weather conditions. Lightning Security for Historic Structures. Charles E. Fisher. Describes the heritage and parts of standard lightning defense systems; discusses inspection, evaluation, and maintenance of systems; https://jasperpbzrk.weblogco.com/22390771/5-easy-facts-about-how-to-prevent-roof-leaks-during-winter-described