https://www.pubpub.org/user/stay-dry-roofing">https://www.pubpub.org/user/stay-dry-roofing. A high quality roofing will have them installed around the edge of the roofline, where upright wall surfaces meet the roof https://lilianztkn824481.dailyhitblog.com/45093841/the-25-second-trick-for-stay-dry-roofing