Air transportation accounts for more than _____ of all water-vapor movement in building cavities.

Air transportation is a significant mechanism for the movement of water vapor within building cavities. It is understood that a substantial portion of moisture transfer occurs via air movement rather than diffusion alone. Recognizing that nearly all water vapor movement is linked to air movement emphasizes the importance of proper ventilation in building design.

When you state that air transportation accounts for more than 98% of all water-vapor movement, it highlights just how critical effective ventilation systems are in managing moisture levels. Adequate ventilation helps prevent issues like mold growth, wood rot, and structural damage, which can arise from excessive moisture trapped in the building envelope.

By prioritizing air movement as the primary means of moisture transport, inspectors and builders can ensure that they are addressing the most impactful aspect of moisture management in buildings. This understanding is foundational for maintaining healthy indoor environments and prolonging the longevity of building materials.