Commonly known as Ultrafloor, this composite flooring system is comprised of precast, prestressed concrete inverted tee-beams, spaced apart with infill panels spanning between the flanges of the beams. The floor is completed with a lightly reinforced in-situ concrete topping which, when hardened, utilises its compressive strength and acts compositely with the tensile strength of the precast beams to efficiently carry the design loading of the floor.