https://www.callupcontact.com/b/businessprofile/Stay_Dry_Roofing/9941495">https://www.callupcontact.com/b/businessprofile/Stay_Dry_Roofing/9941495. A quality roofing system will have them mounted throughout the side of https://craigrwiw138509.blogocial.com/5-easy-facts-about-stay-dry-roofing-explained-75427591