https://www.pageorama.com/?p=staydryroof">https://www.pageorama.com/?p=staydryroof. A high quality roof covering will certainly have them mounted all over the side of the roofline, where vertical walls meet the roof https://ezekielusnp873345.thelateblog.com/39903355/5-simple-techniques-for-stay-dry-roofing