What performance requirement applies to air barrier components?

The performance requirement for air barrier components is typically expressed in terms of air leakage rates, measured in cubic feet per minute per square foot of surface area (cfm/ft²) at a specified pressure differential, often 1.56 pounds per square foot (psf) or 75 pascals (Pa).

The correct choice reflects an acceptable level of air leakage for effective air barrier systems, which plays a crucial role in the energy efficiency of buildings. It ensures that the building envelope remains effective at preventing unwanted airflow that could lead to energy loss, moisture issues, and diminished indoor air quality. An air barrier that allows a leakage of 0.04 cfm/ft² at this pressure is generally considered to meet performance standards set forth by organizations such as the ABAA, affirming its adequacy in maintaining building integrity and efficiency.

Other options present values that either exceed or fail to meet these performance thresholds, indicating less effective air control which could result in performance issues in real-world application.