As you can see in picture I am getting ice dams on my house in these 8 areas (1 shown in picture) which will leak inside of home when it gets bad. It appears snow is melting on the second story roof. It then drips down on the lower roof and makes ice damns when it hits the gutters. Over the dormers the rafters are 8 inch and they are all spray foamed. There is no insulation above the ceiling on the second floor and no ventilation. What is the best way to fix this issue. Could I use blow in insulation on the 2nd story ceiling?