https://www.pearltrees.com/staydryroof1/item775054662">https://www.pearltrees.com/staydryroof1/item775054662. A high quality roof will have them installed throughout the side of the roofline, where upright wall surfaces https://nelsonejcj641328.arwebo.com/61839818/the-best-strategy-to-use-for-stay-dry-roofing