Building air quality is a measure of the number of pollutants, temperature, and humidity of the air. These factors can all affect not only the health and comfort of occupants, but also the longevity of a building.
If faulty flashing has resulted in a leak, it may require not only the flashing to be repaired, but also the areas that have rotted. Water rot can lead to mold and other issues.
The envelope as a building is in place to act as the barrier between the warm, dry indoor environment of the building and the potentially cold and wet environment outside of the building.
