How Do Ice Dams Form - Ice dams form when snow that has accumulated on the roof melts and runs down to the gutter system. When the melted water collects in gutters and refreezes, it blocks water from. As the meltwater runs into. Ice dams form when heat from the roof melts snow.
Ice dams form when heat from the roof melts snow. When the melted water collects in gutters and refreezes, it blocks water from. As the meltwater runs into. Ice dams form when snow that has accumulated on the roof melts and runs down to the gutter system.