partial re-roof

my house has a metal roof installed over asphalt shingles over plywood. part of the rear roof had a very flat pitch and was leaking. i hired a contractor to change the slope of that portion of the roof. he cut back into the steeper slope roof and framed (2 x 8) the roof to a 3:12 pitch and tied into the old fascia line. He installed the metal roofing directly over the framing. He had to cut back 8 feet on the lower edge of the old roof in order to acomodate the new framing. After I removed the old drywall ceiling and fiberglass insulation that had bee damaged by the old roof leaking this fall, I found heavy condensation every cold morning. This room is heated primarily by a wood stove, which I haven't fired up yet due to the lack of insulation and ceiling in across the first 8 feet of the room. The room is approximately 20 feet wide. Will the condensation continue to be a problem if a insulate and install the ceiling? If so, what are my alternatives? Would it help to drill holes in the old roof so that it can vent to the attic?