1.   Ice dams can occur on houses with steep roofs, shallow roofs, houses with gutters, houses without gutters, slae roofs, wood roofs and asphalt roofs.

2.   Ice dams occur on the edges of the roofs of uninsulated and underinsulated houses, and unvented attics.

3.   Ice dams can occur on steep or shallow roofs.

4.   Ice dams can occur with or without gutters.

5.   Ice dams occur only when there is a heavy buildup of snow.