Full Precast Buildings System  Combining architectural and structural precast concrete components can provide the entire building envelope. The system can take several forms, including precast columns and beams with panelized cladding or load-bearing precast walls and double-tee or hollow-core flooring. It provides a significant number of advantages. The ability to begin fabrication while permitting and site work are completed allows precast concrete to begin erection as soon as foundations are complete