The answer to 'downspouts ice dams' is that ice dams form when melting snow and ice cannot properly drain from your roof through the downspouts. This can cause water backup, leaks, and damage to your home. Common causes include poor insulation, inadequate ventilation, and debris buildup in the downspouts.
Symptoms of downspout ice dams include icicles forming on the edges of your roof, water stains on ceilings and walls, and even structural damage from the weight of the ice. To address this issue, you can try clearing debris from the downspouts, insulating your attic, and ensuring proper ventilation. However, for more complex problems, it's best to call a professional roofing contractor who can properly diagnose and fix the issue.