https://disqus.com/by/staydryroof/about/">https://disqus.com/by/staydryroof/about/. A top quality roofing will have them installed around the edge of the roofline, where vertical walls meet the roofing system slope, https://mattiedfmq001769.dreamyblogs.com/39857080/the-best-strategy-to-use-for-stay-dry-roofing