https://www.pearltrees.com/staydryroof1/item775054662">https://www.pearltrees.com/staydryroof1/item775054662. A high quality roof will certainly have them set up around the side of the roofline, where upright walls meet https://sidneymmdo991110.bloginwi.com/73134016/stay-dry-roofing-things-to-know-before-you-buy