As building energy codes become increasingly stringent, improving the building enclosure to reduce air infiltration and thermal losses has become essential. One of the most common sources of uncontrolled air leakage is the transition between the air barrier and fenestrations or other wall openings. Although air barriers have been required by the International Building Code (IBC) for some time, the design documents often still do not provide continuity or redundancy in the connections. Frequently, discontinuities are related to a lack of understanding of the differences in the moisture management systems and primary seal locations for each system. This presentation will explore the design and detailing of air barrier connections at fenestrations, highlighting how the different fenestration systems affect detailing.