This is why you see the frost.
Nails in my attic are dripping wet.
I noticed that they installed 4 roof vents but did not cut them out.
Also my wife had the roof done before we married.
The nails that you see in your attic get as cold as the outdoor temperature.
I have a roof that is 10 years old gaf timberline 25.
Not sure if that has anything to do with it.
All of this is one half of your problem.
There may be no vapor barrier in your ceilings allowing the water vapor to pass into the attic.
If you have a friend in the attic ask him to direct you to a sturdy spot where the nail can bite into the wood.
Every nail chisel tip in the attic is dripping.
The nail chisel tips are rusted.
Could the roof have cooked itself in 8 years like that.
The best solution for controlling moisture is at its source.
The air in the attic has water in it and it condenses on the cold metal.
In your case a attic access hatch or doorway is leaking badly allowing quantities of water laden air to come in contact with your roofing nails.
If the problem is the result of water or moisture penetrating the foundation or floor slab there are many remedial actions which may help.
Hammer a new nail into the roof about 1 inch above the hole from the previous nail.
If the women don t find you handsome they should at least find you handy.
These same condensation points the roofing nails will often map exactly the drip stains found on the attic insulation or attic floor below each nail.
A point often overlooked is that since it s winter the water freezes on the cold nails.