Why Do North-Facing Roofs in St. Paul Develop Ice Dams?
North-facing roof ice dams in St. Paul can persist because shaded slopes retain snow and frozen eaves longer. Household heat can warm the upper roof deck, producing meltwater that refreezes at the colder overhang. Orientation affects ice persistence, but doesn’t establish the cause. Recurring dams require inspection of heat loss, insulation, ventilation, drainage, and roof…
