https://www.openlearning.com/u/staydryroofing-t93m0l/about/">https://www.openlearning.com/u/staydryroofing-t93m0l/about/. A high quality roof will have them mounted all over the side of the roofline, where upright walls https://fraserdeic684965.blogscribble.com/39774425/stay-dry-roofing-questions