This manual contains guidelines for maintaining precast concrete parking structures. It is common for a variety of nonprecast materials such as cast-in-place concrete, steel, and masonry, to be incorporated into precast concrete parking structures. Most guidelines contained in this manual are generally applicable to nonprecast materials and systems. However, some of the nonprecast components may require maintenance procedures that are not covered in this manual. In addition, mechanical/electrical, security, and revenue control systems, elevators, and other nonstructural systems have specific maintenance requirements that are typically developed by the manufacturer or supplier. These additional requirements should be incorporated into the facility's maintenance program.