https://www.robertehall.com/profile/gordonperkins3310196409/profile">https://www.robertehall.com/profile/gordonperkins3310196409/profile. A quality roofing system will have them mounted around the side of the roofline, https://jadakcvb406653.blog-eye.com/39868598/the-facts-about-stay-dry-roofing-uncovered