What is the main purpose of base flashing?

Base flashing serves a crucial role in the integrity of roofing systems, particularly at the junctions where the roof meets vertical structures, such as walls or chimneys. The primary purpose of base flashing is to prevent moisture from entering the roof-wall structure. It acts as a barrier, directing water away from these vulnerable areas and ensuring that any water which may flow down the roof does not seep into the building's walls.

This prevention of moisture intrusion is vital in avoiding water damage, mold growth, and decay within the structural components of the building. Properly installed base flashing helps maintain the long-term durability of the roofing system and the overall structure by safeguarding against the elements.

While enhancing the aesthetic of the roof and providing insulation might be considerations in certain situations, they do not reflect the fundamental purpose of base flashing. Similarly, adding weight to the roofing system does not contribute to the effectiveness or necessity of base flashing. Therefore, the correct identification of the purpose of base flashing is integral in understanding its importance in roofing applications.