https://johnnylist.org/Stay-Dry-Roofing_323476.html">https://johnnylist.org/Stay-Dry-Roofing_323476.html. A quality roof will have them set up around the side of the roofline, where vertical walls meet the roof covering https://imogenzrzj615170.angelinsblog.com/38416886/the-15-second-trick-for-stay-dry-roofing