humidity in the house is too high.has nothing to do with attic insulation as the attic itself would be sweating without vents and then dripping trough the drywall into the living space. and you have probably poked your head into the attic to see if any moisture marks or water in the vapour barrier plastic .

you need an exaust fan connected to a humidistat. then it will come on automatically until the humidity is below 40% .or open a window when you shower or make dinner.