What is AeroBarrier AeroBarrier is a mist that is dispensed into the living area of the home, and when pressurized, it fills and closes gaps as small as a human hair — tightly sealing the building envelope. The process takes approximately three hours, and when complete, near-zero envelope leakage is guaranteed. With little or no envelope leakage, energy demand decreases and energy efficiency dramatically improves. The mist is GREENGUARD Gold certified. For MSDS, click here.