The answer to 'why is my gutter guards ice dams' is that ice dams can form behind gutter guards, causing water to back up and potentially leak into your home. This is a common problem during the winter months when melting snow and ice have nowhere to drain properly.
Gutter guards are designed to keep leaves and debris out of your gutters, but they can also trap ice and snow, preventing proper drainage. As the snow and ice melt, the water has nowhere to go and can back up, forming an ice dam that can cause water to seep into your home through the roof, walls, or foundation.