Course Description: This session will provide an overview of the importance of an air barrier including the most important design considerations, common shortfalls in design and execution, and the difference between a whole building air barrier and a unit-by-unit compartmentalization air barrier. Learning Objectives: Understand difference between whole building air barrier and compartmentalization. Understand benefits of compartmentalization including energy efficiency, improved comfort, reduced pests, and enhanced indoor air quality. Articulate the pros and cons of whole building options for air barriers. Define the u2018redlineu2019 air barrier for a building and multifamily unit for unitized compartmentalization. Identify air barrier transitions and where new details are needed to confirm a continuous air barrier is maintained. Discover weak points in executing an air barrier on site. Real world examples from site photos will include typical multifamily design details, building materials, and strategies. Upon completing this 1 hour online course, students will receive a Certificate of Completion.