I have built a house inside of a metal building. The building is 30'X60'. The building was built on a slab, all walls and roof was insulated with 3" of insulation. I framed out the inside of the building for the house there is 3 1/2" insulation in the walls and 10" in the celling Joyce, there is an air gap of 8" in the walls between the insulation of the metal building and the wall studs. There is a 4' crawl space between the celling joyce and roof. I have an access hole from attic of the house to the garage. My question is do I need to ventilate the attic other than to the garage. What about the dead air space between the walls, there is no ventilation there. Help