Masonry Magazine July 2007 Page. 38
Moisture Management
Air movement through exterior walls also significantly reduces their thermal performance and energy efficiency.
Differential air pressure results in air movement through the building envelope. Research and experience has shown that the vast majority of moisture condensation within wall assemblies is caused by movement of moist air from the warm side of the assembly to the cold side. As air moves through the assembly, it carries the humidity with it. Once the humid air reaches colder sections of the wall assembly, it condenses. Since air can move large quantities of moisture, condensation can be very significant. In addition to potential problems with condensation, air movement through exterior walls also significantly reduces their thermal performance and energy efficiency.
Air barriers are designed to prevent the movement of air through a building's exterior walls. In many cases, the air barriers should not prevent moisture permeance (refer to the section on location of air barriers, vapor retarders and weather resistive barriers). However, there are cases where an air barrier can prevent moisture permeance as well as resist penetration of liquid water. Vapor retarders and weather-resistive barriers serve these functions primarily. Although the 2006 (and prior versions of) International Building Code (IBC) published by International Code Council
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