The need to control moisture is dependent on the location of the project. In humid climates the flow of moisture moves toward the interior as a higher humidity exterior moves water to low humidity interiors. In low humidity exteriors and high humidity interiors the flow is to the exterior. Couple this with environmental concerns such as rain or snow and the issues are complex. Because of this, it is important to involve a mechanical engineer to assess the dynamics of the wall system.
In low rainfall climates, single wythe applications may behave without any problems. In high rainfall climates, the Atlas™ wall may require a drainage system consisting of vapor barriers and flashing. Contact your Interstate representative for more information.