The purpose of the present research is to fill that void that characterizes most of the software used today, about the use of ecoSfriendly materials. In fact, while construction techniques are improved in terms of sustainability, programs that should analyse the properties of these materials are often unable to do so. Specifically, in this study, straw bales will be investigated as a representative of sustainable materials. Details of the most important junctions of buildings made of straw bales will be investigated during a process divided into four different phases. The first phase involves the research of the literature and the domain of knowledge related to straw bales as construction material. The second phase focuses on the architectural modelling of the details selected in Autodesk Revit, implementing its material library with thermal properties of straw. The third phase concerns the investigation of the feasibility of a linear flow of data between the BIM tool and the energy analysis tool. The fourth phase is related to the energy simulation of the details in AnTherm, a software specialized in the analysis of thermal bridges and condensation risk. This analysis makes it possible to calculate the distribution of temperature, the heat streams and the vapour diffusion streams within building components made of straw bales. The final goal is to develop a decision support system that can create a connection and an easy interface among Building Constructions Techniques, Building Representation Tools and Building Performance Tools and each of them with the user. In fact, this database of standardized details of the major junctions made of straw bales, should be easily consulted and understood by specialists, students and craftsmen as a selfSlearning tool, with the possibility of next expansions of the system in the future.