https://bizidex.com/en/stay-dry-roofing-construction-862172">https://bizidex.com/en/stay-dry-roofing-construction-862172. A top quality roofing will have them mounted all over the side of the roofline, where upright https://maeijyr030792.shotblogs.com/4-easy-facts-about-stay-dry-roofing-shown-53529454