Abstract: The containment system of this invention is an enclosure that includes an air supported canopy having walls and flooring to enclose a portion or an entire structure. The canopy is generally a flexible, puncture, air impermeable, and cut resistant canopy supported by air beams and customized air bladders. Side and end flaps or tarps hang downward from the canopy and may be held outward from the structure by air bags. The air bladders are used to support the enclosure above the structure and to hold side flaps out and away from the structure. Lower air bladders can be used along lower edges if needed. A system of wire cables enclosed in smooth, lightweight casings, or equivalent, attached and secured to the air bladders provides for movement of the enclosure along the structure. The entire enclosure can be moved without disassembly and reassembly.