https://www.openstreetmap.org/user/staydryroof">https://www.openstreetmap.org/user/staydryroof. A top quality roof will certainly have them set up all over the edge of the roofline, where upright walls meet the roof https://ezekielzmbe161057.bloggosite.com/47122326/the-best-guide-to-stay-dry-roofing