How does humidity affect ductwork in buildings without insulation?

The impact of humidity on ductwork in buildings without insulation is significant, particularly when considering the potential for mold growth. High levels of humidity can lead to condensation forming on the surfaces of the ductwork, especially if the ducts are at a temperature that is lower than the moisture-laden air surrounding them. When this moisture accumulates, it creates an ideal environment for mold spores to thrive, resulting in mold growth.

This situation is exacerbated in uninsulated ducts because they do not have a temperature barrier, allowing outside humidity to influence the internal temperature of the ducts. Consequently, any water that condenses can lead to damp conditions, which are fertile grounds for mold development. Mold not only poses health risks to the building's occupants but can also damage the ductwork and reduce overall air quality.

Understanding this relationship is crucial for maintaining healthy indoor environments, especially in multifamily homes where shared air systems can spread contaminants easily. Thus, the concern about mold growth is a key reason why managing humidity levels is essential in dealing with uninsulated ductwork.