Which of the following is NOT listed as a way water can enter basements and crawl spaces?

• A. Condensation
• B. Gravity
• C. Diffusion
• D. Capillary action

Answer: (A)

Moisture can enter basements and crawl spaces mainly through physical pathways that move water from outside into the structure or into its materials: water can seep in due to gravity and hydrostatic pressure, move as water vapor diffuses through walls, and be drawn upward through pores in capillary action. Condensation, on the other hand, is the process of water vapor turning into liquid when the air is cooled or becomes humid. It describes a change in moisture state inside the space, not a pathway that allows outside water to enter. So while condensation can add moisture to a basement, it isn’t a means of ingress and isn’t listed as a way water can enter.