https://www.twitch.tv/staydryroof/about">https://www.twitch.tv/staydryroof/about. A top quality roofing will have them mounted all around the edge of the roofline, where vertical wall surfaces meet the roof incline, https://jimevsz268700.tusblogos.com/40018771/see-this-report-on-stay-dry-roofing