I have been struggling with this in the planning stages. I will be using a "shed" type roof, one that is taller in front and slopes to the rear. I am using metal roofing. I can't figure out how to seal off the front, or high point, on the front side of the roof. The metal roofing has ridges and I figure rain etc. can get in under those high points on the metal. How do I enclose that? Any ideas?