When a fire broke out in this retail food store, most of the building was destroyed. The damaged structure, consisting of metal posts and framework as well as façades in metal cladding, was quickly declared unfit. Although the roof resisted during the fire, the client wished to ensure its stability during the operations to clean and clear the site. The system put in place by the OSMOS teams informs the client on any changes to the roof in real time and continuously. The three optical strands installed on the purlins and roof beams, are connected to an OSMOS smart station. The sensor network, complemented by a temperature sensor and an alarm system, ensures for the client that the system will be triggered if certain thresholds are exceeded.