Pic related.
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That’s ice damming. Basically it can be prevented with proper ventilation of roof cladding/shingle nail board. Normally eaves, baffles, and turtle/ridge vents will be enough to prevent icicles more than. 6 in long.
Yup it certainly is. It was removed to prevent water buildup on the roof that would cause leaks.
In the spring I’ll address the root cause.