What is a potential consequence of improperly installed flashing in roofing systems?

Improperly installed flashing in roofing systems can lead to significant issues, particularly water intrusion and damage. Flashing is a critical component designed to direct water away from vulnerable areas of the roof, such as where different materials meet or around penetrations like chimneys and vents. When flashing is not installed correctly, it may create gaps or allow water to seep beneath the roofing materials. This can ultimately lead to leaks, water accumulation, and, over time, serious damage to the roof structure, insulation, ceilings, and walls of the building. Aside from structural concerns, this can also prompt issues like mold growth and increased maintenance costs, underlining the importance of proper flashing installation to ensure the roof's integrity and longevity.