https://www.provenexpert.com/stay-dry-roofing6/">https://www.provenexpert.com/stay-dry-roofing6/. A top quality roof will have them set up throughout the side of the roofline, where vertical walls meet the roofing https://kobimirq444567.jts-blog.com/38240750/7-simple-techniques-for-stay-dry-roofing