This course examines the importance of the building envelope in a sustainable, high-performance structure, as well as the structure-as-a-system building science that studies the interaction between envelope, mechanical equipment and occupants, impacting the performance (or lack thereof) of the building as a whole and the envelope itself. From insulation materials to air barriers, wall systems, roofing, fenestration and concrete to emerging technologies, advanced solutions for high-performance building shells are discussed and presented via project profiles from across North America.