https://go.bubbl.us/ef8bbe/1136?/Stay-Dry-Roofing">https://go.bubbl.us/ef8bbe/1136?/Stay-Dry-Roofing. A quality roofing will have them installed all around the side of the roofline, where upright walls meet the roof https://cormacjibn472494.fireblogz.com/70860846/all-about-stay-dry-roofing