My home attic was insulated by a company that contracted with the state energy assistance program. They did a home energy assessment, air sealed, and insulated the attic. The second floor of my home is a rectangular structure built within the triangular roof area to about the upper third of the roof. The unconditioned area of the roof is about 3 feet high from above the blown in cellulose.  The lower part to that point is insulated against the rafters with blown in cellulose. The area above the ceiling of the second floor has several feet of blown in fiberglass insulation. The upper third of the attic is not otherwise insulated. 

When I measured the moisture of the wood in the attic it was between 18 & 26 percent.  When it’s freezing outside I can see a a layer of frost on the wood 

 

Shortly after this was done I experienced frost and moisture in the attic with occasional drips coming through the ceiling/wall where it meets the roof line on the second floor. The company came and vented the roof with four static vents on the back of the home near the roofline. This didn’t solve the issue completely.

I’ve had roofing and another insulation company out and none could offer any advice. I’m afraid this ongoing cycle of dampness will eventually ruin my roof which is less than a decade old not to mention my rafters. 

Here are some photos. https://drive.google.com/drive/folders/1_Sw8RDj9PhY14yrFM7syoBTTxjtYOPph