Following the architectural project, Costruire Leggero proceeds to the engineering of Light Steel Frame sy-stem structures. A new concept of building with dry anti-seismic and sustainable assembling. The structu-res are completed with external walls, internal walls, roofing systems and envelopes of all kinds. The va-rious components and sub-systems, structures, systems, envelope closures, interact with each other sy-nergistically and efficiently.