Update on my roof situation. See the orange icicles in the photo? I think the ice dam has already caused leaking through the shingles and plywood and onto the metal roof, then leaked down to cause the second icicle layer containing rust.
Even with the increased ventilation of the soffit that I did this summer, I'm still getting large ice dams. I'm not sure what to do at this point. Even worse, these icicles are hanging on my power line.