Attic vents are one of the unsung heroes in a home ... In addition, warm air that escapes the living space will condense on rafters or roof sheathing in an unvented attic. "Frost accumulation ...

Prior to insulating, install polystyrene rafter air channels ... you will need a motorized vent at one end of the attic to exhaust the heat, and an adequately sized vent on the opposite end ...