Ice dam basic ! part 2

Ice dam are common on low sloped roofs or roofs which change slope near the eaves.Large eave overhangs (wide soffits ) are more prone to ice dams.Ice dams may also occur where a roof above a heated area extends out over an unheated area such as a porch or balcony.
Very often, the northern slope of the roof is more vulnerable to ice damming than the southern section.The heat of the sun helps to melt the snow uniformly across the south roof surface and allow re-freezing in this area can create ice dam .