What is a potential consequence of inadequate vapor diffusion retarding?

Inadequate vapor diffusion retarding can lead to mold growth and other moisture-related issues because vapor diffusion retarders are designed to slow the movement of moisture through building materials. When vapor barriers or retarders are insufficient, moisture can accumulate within walls and other structural components, creating an environment conducive to mold development. This can result in significant health risks for occupants, along with potential structural damage to the building itself.

In contrast, the other options, such as increased natural light, improved indoor air quality, or lower heating costs, do not directly relate to the consequences of inadequate vapor diffusion control. Increased natural light is influenced by window placements and types rather than vapor control, while improved indoor air quality is generally a result of effective ventilation and filtration practices. Lower heating costs are typically associated with insulation properties and energy efficiency measures, rather than moisture management directly linked to vapor diffusion. Thus, the focus on mold growth highlights the critical role that proper vapor diffusion retarding plays in maintaining a healthy and safe indoor environment.