What is the minimum airspace that must be provided between the insulation and the roof sheathing of an enclosed attic?

The minimum airspace required between the insulation and the roof sheathing in an enclosed attic is crucial for maintaining proper ventilation. This air barrier allows for the flow of air that helps to regulate the temperature of the attic space, preventing heat buildup and reducing the potential for condensation that can lead to moisture problems, mold growth, or structural damage.

The maintenance of a 1-inch airspace is essential to allow enough airflow while accommodating standard insulation installation practices. This air gap assists in keeping the roof sheathing cool during hotter months, thus enhancing the overall energy efficiency of the building. Having less than this specified space could compromise the effectiveness of ventilation and insulation, potentially leading to costly repairs and energy inefficiency in the long run.