1. The driving force for air leakage is:
a. The difference in total air pressure across a building assembly, with airflow occurring from positive to negative pressure.
b. The difference in total air pressure across a building assembly, with airflow occurring from negative to positive pressure.
c. Stack Pressure d. Leaky materials in the building envelope
2. What is the driving force for vapor diffusion:
a. The difference in the total air pressure between the interior and exterior of the building.
The difference in water vapor concentration or difference in vapor pressure across an assembly.
The difference in atmospheric pressure at the top and bottom of a building due to difference in temperature. Water intrusion into a building
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