Which of the following objective does flashing primarily serve in roofing?

Flashing serves the crucial purpose of preventing water leakage on a roof. It is typically installed in areas where the roofing material meets a vertical surface, such as walls, chimneys, or roof valleys. These transitions are prone to leaks due to the potential for water to flow into joints or gaps. Properly installed flashing directs water away from these vulnerable areas, effectively creating a barrier that keeps the interior of the building dry.

While airflow, thermal insulation, and aesthetics are important considerations in roofing design, they are not the primary functions of flashing. The primary objective is to protect the building from moisture intrusion, highlighting its essential role in maintaining a watertight roofing system.