Voided PT Slabs are used for construction of floor and foundation of concrete structures. Application of such slabs minimizes weight of buildings and ensures light weight of foundation. Length of these construction accessories are usually 25 feet and more. Besides saving construction cost, Voided PT Slabs eliminate the necessity of erecting beams during flat plate construction. These are also useful to minimize vibration level of concrete flooring. By reducing dead weight of floor, these slabs ensure better protection of structures against earthquake.