Why should you build a rooftop lightning protection system with either all copper or aluminum components?
On pg. 238, about lightning protection systems, it says, "...these instructions are for copper only-do not use copper with aluminum."
Why shouldn't we use copper components with aluminum? It's essentially just a couple of lightning rods and a cable leading to a ground rod. I can scan the page if you'd like to read it. They made it sound fairly important.