What is the current whole building air leakage requirement set by USACE?

The current whole building air leakage requirement set by the U.S. Army Corps of Engineers (USACE) is 0.25 cubic feet per minute per square foot (cfm/ft²) at a pressure differential of 1.56 pounds per square foot (psf). This standard reflects a commitment to energy efficiency and building performance, as lower air leakage rates are crucial for maintaining indoor air quality and reducing energy costs.

By establishing this requirement, USACE aims to minimize uncontrolled air leakage in buildings, which can lead to higher heating and cooling demands, increased energy consumption, and reduced occupant comfort. A leakage rate of 0.25 cfm/ft² is significant in promoting better envelope performance and is consistent with contemporary energy codes and standards focused on sustainability and efficiency.