The answer to roof ice dams is that they are a common problem caused by improper insulation and ventilation in your home. Ice dams form when snow on your roof melts, usually due to heat escaping from your home, and then refreezes at the edge of your roof, creating a barrier that prevents proper drainage.
Symptoms of ice dams include icicles hanging from your gutters, water damage to your home's exterior and interior, and even potential structural damage. To solve this issue, you'll need to address the root causes by improving insulation and ventilation in your attic and along the roof's edge. This may involve adding more insulation, sealing air leaks, and ensuring proper airflow through your attic and roof vents.