THE GREEN_ZERO SHELL The overall design of the module represents one of its distinctive traits, further highlighted by the element marking its perimeter. The module is conceived as a flat surface bending to form a C — sewn on one side with thin metal threads — which enables the project to naturally develop inside the shell. The GREEN_ZERO module is a prefabricated architectural system, in which the structural shell is made entirely from wood; it is provided with a frame and its stratigraphy, of both horizontal and vertical parts, is characterised by load-bearing and insulating elements, which allow the passage of installations, and the presence of an air chamber, created to obtain a specific assembly in accordance with climate conditions and thus being awarded the classification KlimaHaus A or KlimaHaus Gold. The cladding outer surface integrates a new thin photovoltaic panel system, which allows to supply the entire installation complex with the electrical power necessary to its functioning. The zinc-titanium membrane applied to this type of panel proves highly malleable and thus allows to perfectly fit the curved surfaces of the module and create all the technical elements fundamental to ventilation, management or recovery of rainwater. The prefabricated structure needs to be anchored to the ground on a natural stone foundation, that is a system composed of split-face stones of different grain size, compacted and retained by a metallic cage in order to achieve the ideal mechanical resistance. The external cladding is realised using a modular pattern of wooden boards, thus permitting to hide the fixing screws; its surface is polished with a natural wax coating, that can be regularly renewed, unless wood ageing and oxidation are preferred.