https://blogfreely.net/staydryroof/2o3fu8cnw2">https://blogfreely.net/staydryroof/2o3fu8cnw2. A top quality roofing will have them mounted all around the side of the roofline, where vertical walls satisfy the roofing https://flynnvihl660155.humor-blog.com/38111556/stay-dry-roofing-fundamentals-explained