Ice dams are the number one reason homeowners call residential roofing contractors during winter. Characterized by unmistakable icicles forming on the eaves of your roof, ice dams can cause massive damage, not only to the roof itself but to your attic as well. As ice dams form every winter, your roof will begin to show signs of early deterioration, which could mean you’ll be needing a replacement earlier than the expected life span of your roof.