At this point, until the ice melts getting more ventilation (air circulation) in the roof. After the ice melts Art is correct. Ice and water shield from the edge of the roof to AT LEAST 4 feet above the exterior walls. Then figure out how to get more ventilation. I've even put a box fan up in the roof. Helps a lot. Especially after a long cold spell and before it warms up and all that ice built up on the rafters starts to melt.
