Understanding building physics is critical to proper building envelope design. This course takes a relatively complex subject and reduces it to a level that teaches practical concepts for the building designer. This course will examine how various cladding systems perform across different climate zones and applications. Basic concepts including environmental control layers and hygrothermal loads are reviewed. Emphasis is placed on the concept of the “Perfect/Universal Wall”, and how utilizing the proper sequence of wall components can greatly simplify wall design in all climate zones. Insulated metal panels (IMPs) are a unique form of the “Perfect/Universal Wall”, and we will investigate how they perform the same functions as multi-component systems, simplifying wall system design and installation.