https://zenwriting.net/staydryroof/jkrt0x8hhx">https://zenwriting.net/staydryroof/jkrt0x8hhx. A top quality roofing will have them mounted all around the side of the roofline, where vertical walls meet the roof covering https://saulnkwa645357.post-blogs.com/60186825/the-main-principles-of-stay-dry-roofing