https://www.mixcloud.com/staydryroof/">https://www.mixcloud.com/staydryroof/. A quality roof will have them mounted all around the edge of the roofline, where upright walls meet the roofing incline, around pipelines https://joshjpyd042692.blogdosaga.com/39520308/the-4-minute-rule-for-stay-dry-roofing