Wet underside of roof
This actually isn't a disaster yet, but I need to figure this out quickly...!
We have a 1920's cape-cod style house in Massachusetts with an asphalt-shingled roof. We had it re-roofed this summer and the contractor used ice and water shield over virtually the entire surface as an extra measure of protection against leaks.
Now that cold weather is upon us, we noticed that it seems damp in the attic eaves and some areas of the underside of the roof decking are damp.
My concern is that the roof is now so "tight" that moisture is getting trapped in the attic and condensing on the cold underside of the roof decking. (You hear stories of this sort of thing happening if people vent dryers into the attic, etc.).
Could there be a connection here? Would the solve be to improve the ventilation? I have a couple of small gable vents, but nothing in the ridge or down near the soffits. This was absolutely not a problem before we re-roofed.
I'd appreciate any advice or thoughts about what to do next.