Building failures remain significant despite recent advances in building technology and adopting performance-based building codes. The effect of incorporating innovative materials or systems in the moisture management potential of a building envelope component must be evaluated before use since the durability of the building may be compromised if these technologies lead to excessive moisture accumulation within the structure. The available analytical, numerical and laboratory experimental test cases used to assess the accuracy of these models are also based on simple geometry and boundary conditions to yield one- or two-dimensional heat, air, and moisture (HAM) transfer processes. In reality, however, HAM transport is three-dimensional and involves complex airflows and convection loops in cavities, and thermal bridging at junctions such as at wall/roof, wall/window, wall/floor and other connection points. Our research focuses on investigating the long-term hygrothermal performance of building envelope components via computer modeling and experimental study. The BSCE uses a combination of computer models, experimental investigations and field monitoring to develop and study building enclosures from an energy efficiency, inhabitant comfort and durability perspective.