Just thought & question, can you do a Ground mount system, vs. roof.. Is there a reason you Must do roof? Knowing Ohio and winters, a Grd mt system would be easy to do tilting for snow removal. 7 or 8 panels would not take up much room. But on roof seen in your jpg. I would be concerned. Just on the Snow accumulation. The wind can be dealt with and snow load.. What is the pitch of the roof. another consideration, and how to go up on a cold day with ice accumations both on PV panels and roof surface.. Just some thoughts. Wish you the best.