It is the building enclosure where many sustainable design intentions find their physical expression. Here, as well, is where the majority of legal claims against designers find their expression. The building enclosure has three major assemblies-foundation, walls, and roof- each with as many as 10 (or more) components. Sustainable design requires integration of these assemblies and their components in a way that manages the major degradation vectors- water, air, heat, radiation, pests, and even occupants. This course will cover the building enclosures for both commercial and residential structures. A major focus of the course will be the relationships among green building, building science, energy efficiency, durability, and risk management. Students will leave the course with a new way of understanding, analyzing, and designing sustainable enclosures. An equal emphasis will be placed on design, specification, construction, and commissioning of building enclosures.