Brad writes from Interlochen, Michigan: "I'm building a new log home in Northern Michigan. The home has 2x12 rafters. The insulation contractor installed R-38 batt fiberglass with baffles from eve to ridge without a vapor barrier which is not code in this area. My questions - should I have them install a vapor barrier over the fiberglass before the finished ceiling material (tongue & groove pine) is installed? If so, will potential issues could I have with condensation with or without a vapor barrier?"

Answer: In the Northern Michigan area where you are building, a vapor retarder is normally used facing the warm air side of the assembly. There may be a special consideration here we don't know about. Perhaps your local building inspector may be able to help resolve your concern.