https://www.openlearning.com/u/staydryroofing-t93m0l/about/">https://www.openlearning.com/u/staydryroofing-t93m0l/about/. A top quality roofing system will certainly have them installed around the side of the roofline, https://zoeiayi146847.eedblog.com/39796795/see-this-report-on-stay-dry-roofing