It is vital to the long term success of any structure to employ an impenetrable building enclosure. The definition of a building enclosure or a building envelope: It is the physical separator between the conditioned and unconditioned environment of a building. This includes the resistance to air, water, heat, light, and noise transfer. There are three basic pieces to a building envelope: weather barrier, air barrier, and thermal barrier. Engineered Systems is proud to represent key manufacturers that can assemble a building design that will stand the test of time and keep the building safe from the elements.