How does maintaining a minimum gap between the insulation and sheathing benefit a building?

Maintaining a minimum gap between the insulation and sheathing is crucial for maximizing insulation performance. This gap allows for proper ventilation and airflow, which helps to manage moisture levels within the building envelope. When insulation is tightly packed against sheathing, it can trap moisture, leading to issues such as mold growth and reduced effectiveness of the insulation due to wet conditions. The gap also ensures that the insulation can perform to its highest thermal resistance, preventing heat transfer and maintaining energy efficiency within the building. By allowing air to circulate, the gap contributes to a more effective thermal barrier, ultimately enhancing the overall performance of the insulation system.