https://www.openstreetmap.org/user/staydryroof">https://www.openstreetmap.org/user/staydryroof. A high quality roofing system will certainly have them mounted around the edge of the roofline, where upright wall surfaces https://haseebjwod469808.blogmazing.com/38412551/the-ultimate-guide-to-stay-dry-roofing