What is the minimum space required between roof sheeting and insulation to allow air passage?

The minimum space required between roof sheeting and insulation to allow for adequate air passage is 1 1/2 inches. This clearance is important to ensure proper ventilation in the roofing system, preventing moisture buildup that can lead to mold growth and structural damage. Adequate airflow helps maintain a balanced temperature in the attic, enhancing energy efficiency and longevity of roofing materials. The specified distance ensures that air can flow freely, promoting effective ventilation without compromising the insulation's ability to function. Proper understanding of these requirements is critical for compliance with building codes and best practices in home improvement projects.