A modular enclosure may include a number of components, such as floor panels, wall panels and roof panels, which may be interconnected to form a structure such as a shed. For example, the shed may include wall panels with connecting portions that are sized and configured to allow adjacent wall panels to be interconnected. The wall panels may also include outwardly extending projections that allow the wall panels to be connected to the floor panels. In addition, the wall panels may include receiving portions that may receive portions of the roof panels, such as an outwardly extending lip. Advantageously, a truss may extend through the receiving portions in the wall panels and the truss may include a channel that is sized and configured to allow any water that enters the shed through a roof panel seam to be removed from the shed.