https://www.pearltrees.com/staydryroof1/item775054662">https://www.pearltrees.com/staydryroof1/item775054662. A top quality roofing will have them mounted all over the side of the roofline, where vertical walls satisfy https://lexiejhra076942.blogtov.com/20176386/indicators-on-stay-dry-roofing-you-need-to-know