Roof ice dams are an annoying source of roof damage, leaks, and heat loss in the winter.
The main causes are drip melt from improperly capped warm air vent pipes and poor roof insulation.
Laying a snow melt sock onto the roof so it crosses the ice dam and overhangs the gutter
will melt through the snow and ice and create a channel for water to flow down into the gutters or off the roof.