Which impact does condensation have in poorly ventilated attics?

In poorly ventilated attics, condensation occurs when warm, moist air rises and cools down on the roof's underside, leading to the accumulation of moisture. This excess moisture can create an environment conducive to the decay of wood due to either fungal growth or deterioration of structural integrity. Without proper ventilation, this moisture stays trapped, causing wooden elements such as rafters, beams, and sheathing to become weakened over time. Therefore, addressing ventilation issues is crucial for preventing wood decay, which can ultimately compromise the structural soundness of the entire roofing system.

In contrast, the other choices do not accurately reflect the consequences of condensation in attic spaces. Options regarding promoting moss growth, enhancing roof stability, or preventing moisture damage do not align with the reality of how moisture accumulation affects building materials.