I've seen threads describing nail drips and possible causes. I had never seen this problem in my attic until now. We had our roof cleared of snow 5 days ago, and I'm wondering if having two people on the roof, clearing it off, could of in some way led to this problem. Many of the reasons in the forum seem to suggest bad ventilation. What would cause a change of ventilation suddenly? I'm seeing condensation on about 70% of the nails.
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