https://www.ted.com/profiles/50999207/about">https://www.ted.com/profiles/50999207/about. A high quality roofing will certainly have them installed all around the side of the roofline, where upright walls meet the roof https://keziaspbw589803.vblogetin.com/45558877/9-easy-facts-about-stay-dry-roofing-shown