For many years, designers, contractors, and owners have understood the value of a systematic approach to ensure the mechanical and electrical systems in buildings meet the owner’s needs. This approach is known as the commissioning (Cx) process. As a result of implementing the Cx process into the design and construction of buildings, defect claims and litigation related to these commissioned systems are relatively low. The building enclosure (sometimes referred to as the building envelope), however, has often been excluded in the Cx process. Unlike mechanical and electrical systems, poorly performing building enclosures are the most common causes for construction claims and/or construction defect litigation.1