https://www.pearltrees.com/staydryroof1/item775054662">https://www.pearltrees.com/staydryroof1/item775054662. A top quality roofing will have them installed all around the side of the roofline, where vertical wall https://louisecqkp668616.win-blog.com/20577508/the-smart-trick-of-stay-dry-roofing-that-nobody-is-discussing