https://www.reddit.com/user/staydryroof/">https://www.reddit.com/user/staydryroof/. A high quality roofing system will have them set up all over the side of the roofline, where vertical wall surfaces fulfill the roof https://declanudui815618.answerblogs.com/39917068/stay-dry-roofing-can-be-fun-for-anyone