What is one key function of roof flashing?

One key function of roof flashing is to direct water away from critical areas. Flashing is a material, often made of metal, installed at joints where the roof meets vertical surfaces, walls, chimneys, or other projections. Its primary purpose is to prevent water intrusion at these vulnerable points, which are susceptible to leaks due to the propensity of water to flow and pool. By guiding water away, flashing helps to protect the underlying structures and roofing materials from moisture damage, mold growth, and deterioration over time.

While structural support, insulation, and aesthetics are important aspects of roofing systems, they do not directly relate to the fundamental role of flashing. Flashing's specific design and placement focus solely on water management, making it essential for maintaining the integrity and longevity of the roof and overall building structure.