https://www.openstreetmap.org/user/staydryroof">https://www.openstreetmap.org/user/staydryroof. A quality roofing will have them installed all around the side of the roofline, where upright walls meet the roofing https://leakdxh268408.csublogs.com/47132553/what-does-stay-dry-roofing-do