https://www.pubpub.org/user/stay-dry-roofing">https://www.pubpub.org/user/stay-dry-roofing. A high quality roof will have them installed around the side of the roofline, where vertical wall surfaces meet the roof slope, https://mohamadghhf283777.onzeblog.com/39700805/stay-dry-roofing-things-to-know-before-you-get-this