The model describes a steel structure for a boiler house, where an old fossil steam boiler is replaced by a new one with a total capacity of 9.8 MW. The steam generation system includes a biomass storage area, a handling and delivery system for wood chips, a steam boiler, and an ash collector. The project was executed during the ongoing operation of the existing boiler and posed high technological and executional demands. The deformation diagram was precisely modeled in RFEM. Further information from ag-i.si highlights the interdisciplinary approach within industrial and plant engineering.