Cross ventilation is the process of using vents or other openings in the roof or attic to create a natural airflow that helps to regulate temperature, humidity, and moisture levels in the roof and attic space. Cross ventilation relies on the principle of hot air rising and cool air sinking, creating a natural flow of air through the space.

Cross ventilation in roofing is often achieved through the use of ridge vents and soffit vents. Ridge vents are installed at the peak of the roof and allow hot air to escape, while soffit vents are installed at the bottom of the roof and allow cool air to enter. This creates a natural flow of air through the attic, helping to regulate temperature and prevent the buildup of moisture that can lead to mold and rot.