Among its many functions, the exterior envelope typically must control the movement of heat, air, bulk water and water vapor both in and out of a building.
Over time, various systems and components have been developed to control this movement.
In a properly functioning envelope, these systems work together to maintain the building's temperature and allow components to dry quickly if they become wet. While these systems contribute to overall performance, they also contribute to the complexity of the envelope design and sensitivity to error.
David Cook, Principal Architect, Structural & Architectural Evaluation, authored this April 2013 Construction Specifier article.
The story can be viewed within the Digital Edition of the issue, on pg. 70.