The Pegaso structural system’s main feature is a plane prestressed reinforced concrete slab with an open edge and diminishing in cross-section. The Pegaso slab is combined with pillars (including PVC rainwater down-pipes and overhead travelling crane bracket if needed), TH ground beams and closing gables.

The Pegaso slab diminishing in cross-section allows water to flow through the external edges, thus bypassing the construction of inside building sewer and drainage systems; in the event of extraordinary rainfalls the extrados shape and width allow a remarkable storage capacity and a fast draining of waters.