probably so. my house had only a few gable vents and no soffit vents either. i put a powered vent fan in one gable and cut both the heat AND humidity significantly. cost about 75.00 for the fan, and i had a light right there to tap for power so i wired it myself.

or you could put in a few soffit vents, the more the better.

Have you gotten your issue figured out yet? Do you have water heat? I had my house re-roofed and re-sided last spring and the exact same thing has happened in my walkin attic. It is so wet in some places that it is dripping onto the floor. We just had a contractor here that said there appear to be enough vents. He said that we need to direct the bathroom vents outside instead of into the attic, and to put in a soffit vent and a fan with a humidistat(?). He said that's where we'll start, maybe put in a gable vent and add to the insulation. If you've tried something that's worked, please let me know...thanks!

End the Hard Soffits & go with Ventilated ones. If you don't you have set your roof up for Failure.

Throw in a ridge vent or gable vents as well. SolaTube makes a solar powered attci vent that is easy to install and is powered by the sun.

www.solatube.com