The answer to 'why is my roof ice dams' is that ice dams are a common problem caused by improper insulation and ventilation in your attic. Ice dams form when heat escapes from your home and melts snow on your roof, which then refreezes at the roof's edge, creating a dam that prevents water from draining properly. This can lead to water damage inside your home.
Ice dams are often a sign that your home is not properly insulated or ventilated. Inadequate insulation in your attic allows heat to escape, leading to melting snow, while poor ventilation prevents that heat from escaping the attic. This creates the perfect conditions for ice dams to form.