Air-sealed attached garages help block the leakage of carbon monoxide and other contaminants in the garage from getting into the home. This is achieved by blocking and air sealing floor framing cavities in ceilings above the garage that extend into living spaces; seams along the adjoining living space walls and foundation; and all seams and any holes between the ceiling and any living space above. In addition, any doors between the house and the garage should be self-closing and weather stripped, including a tight-fitting threshold sweep.