I have a 2 story built in 1977. One of the bedrooms upstairs has been closed and the heat turned way down. Entered and found a small amount of mold on one exterior wall. After investigating I believe the moisture is coming from the attic. I live in Minnesota. Opened attic and found frost almost everywhere!
Last summer roof was replaced, vents were plugged a new ridge vent was installed. Soffit vents were replaced last fall. I'm going to check to make sure no soffit vents are plugged with insulation, and check for a vapor barrier below the insulation.
Any other suggestions/ ideas? I've called 5 experts and they all said the same thing, but none of them work on this.
I'm guessing I will install a solar attic fan. Frustrated and dealing with a pregnant wife who is terrified of mold.