In residential construction, what does a proper drainage system primarily help prevent?

A proper drainage system is essential in residential construction as it plays a crucial role in managing water flow and preventing excess moisture accumulation around and within the home. By effectively redirecting water away from the foundation and other critical areas, a well-designed drainage system minimizes the risk of mold and moisture issues, which can lead to significant health hazards and property damage.

Water retention near a building's foundation can create an environment conducive to mold growth, which can affect indoor air quality and result in health complications for the occupants. Moreover, uncontrolled moisture can damage building materials, such as wood and drywall, undermining structural integrity over time. Thus, the primary function of an efficient drainage system is to ensure that water is properly managed, thereby reducing the potential for mold development and moisture-related problems in the residential structure.