https://www.awwwards.com/staydryroof/">https://www.awwwards.com/staydryroof/. A quality roofing will certainly have them installed all around the edge of the roofline, where vertical walls meet the roofing system slope, https://janiceehar959411.actoblog.com/40298044/the-single-strategy-to-use-for-stay-dry-roofing