What is one primary reason to avoid complex flashing details in roofing?

One primary reason to avoid complex flashing details in roofing is that they can obstruct water drainage. Flashing is intended to direct water away from critical areas of the roof, such as valleys, penetrations, and joints. If the flashing design is too complex, it can lead to water pooling or improper drainage, which increases the risk of water infiltration and damage to the roof structure. Effective flashing should facilitate the smooth flow of water off the roof, enhancing its longevity and ensuring the integrity of the underlying materials. Therefore, keeping flashing details simple helps maintain optimal drainage and overall roof performance.