Moisture forming on the glass window panes or other flat surfaces.
Frozen condensation in attic.
The same thing may be happening on the inside of your attic.
Sagging ridgeline drooping ceilings water leaks on interior walls and ceilings jammed doors cracked interior walls near the center of your home creaking sounds.
This is why you see the frost.
Traces where water has trickled down the walls.
Well just like any drain line the water should exit the drain and there should be no concern about freezing.
The air in the attic has water in it and it condenses on the cold metal.
Condensation forms on the outside of the glass where the cold glass is coming into contact with the warm humid air.
If there is a condensate trap insulate it or just remove it since it probably just runs outside from an attic space.
A tool like this shoots nails through shingles.
Signs of condensation in the attic may include the following.
Recognize the signs of stress when too much snow and ice has accumulated on your roof or when you have too much condensation in your attic.
The tips of the nails are supposed to penetrate through the wood on your roof.