What is a common consequence of missing kickout flashing?

Missing kickout flashing can lead to water accumulation, particularly at the junction where a roof meets a vertical wall. Kickout flashing is specifically designed to direct water away from the roof and into the gutter, preventing it from running down the wall. Without this essential component, rainwater can seep behind siding or into the wall system. Over time, this water can lead to significant issues like wood rot, mold growth, and structural damage, as the accumulation of water allows for prolonged moisture exposure.

While green mold formation may occur due to moisture, it is not the immediate consequence of missing kickout flashing. Soil erosion typically arises from surface runoff and is not directly related to flashing issues. Air leakage is more associated with gaps or improper sealing rather than water management and flashing techniques. Thus, the direct relationship between kickout flashing and water accumulation makes it the correct consequence to consider in this context.