Just recently someone was asking about grounding a new metal weather vane on a building on this site. That got me thinking about whether I should attach my old copper lightning rod cables to my new metal roof. The two story house had lightning rods on each of the three gable ends and at least one in the middle. Contractor would have put them back up but you end up putting holes in a new roof and the house looks more modern without them. They weren't in the best of shape after they came off of the existing roof anyway. He offered to run the copper lightning rod cables up under the tin in a channel and then run some screws through the tin and cable. I told him I would think about it and could do it myself. What is everyone doing inregards to lightning protection with a metal roof???