https://profile.hatena.ne.jp/staydryroof/">https://profile.hatena.ne.jp/staydryroof/. A top quality roofing will have them mounted all around the edge of the roofline, where vertical walls satisfy the roofing system https://kiarabxas834888.link4blogs.com/60331163/stay-dry-roofing-things-to-know-before-you-buy