What are two types of sources for roof ventilation?

Ridge vents and soffit vents are critical components of a roof ventilation system. Ridge vents are located at the peak of the roof and allow warm, moist air to escape from the attic space, which is essential for preventing issues like condensation and mold growth. This upward airflow is crucial, especially in warmer months when heat can build up in the attic.

Soffit vents, on the other hand, are positioned at the eaves of the roof and allow cool air to enter the attic. This intake of cooler air works in conjunction with the exhaust of warm air through the ridge vents, creating a continuous airflow that maintains a balanced ventilated environment in the attic. This passive ventilation system helps regulate temperatures and protects the roofing materials and insulation from damage due to heat and moisture buildup.

The other options do not represent effective ventilation sources in the same functional way. For instance, while louvers can facilitate airflow, they usually do not work closely with soffits or ridges in the same integrated manner that ridge vents and soffit vents do. Skylights primarily serve to provide natural light rather than effective ventilation. Chimneys and gutters, while important elements of roofing systems, do not function as dedicated sources for roof ventilation.