How much water can diffuse through drywall in a single year without a vapor diffusion retarder in a 100-square-foot wall?

The correct understanding here hinges on the concept of vapor diffusion through building materials such as drywall. In the absence of a vapor diffusion retarder, typical estimates indicate that approximately 1 cup of water can diffuse through a 100-square-foot wall of drywall in one year. This estimate is grounded in real-world studies and is relevant during the evaluation of moisture control strategies in building construction and home inspections.

Factors influencing this diffusion include the material properties of drywall and environmental conditions such as humidity and temperature differences between the interior and exterior of a structure. When calculating potential moisture intrusion, identifying the amount of water vapor that can move through unprotected surfaces like drywall is crucial for assessing the risk of mold growth or other moisture-related issues within a home.

While the other options present various quantities, they are either too high or too low based on standard estimates for water diffusion through drywall. Understanding this scenario helps home inspectors effectively communicate the importance of moisture management in residential properties.