https://www.reddit.com/user/staydryroof/">https://www.reddit.com/user/staydryroof/. A high quality roofing will have them installed all over the edge of the roofline, where vertical wall surfaces satisfy the roof https://zaynabmxnt170648.elbloglibre.com/39733494/how-stay-dry-roofing-can-save-you-time-stress-and-money