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This communication presents a tool, m2m&Roofsol, which has been developed in the framework of a European project, ROOFSOL, dedicated to the study of passive cooling by roof components. This tool is based on an existing simulation tool, m2m, which allows detailed analysis and simulation of the thermal dynamic behaviour of large building envelopes, and model size reduction techniques[2][3]. Two main problems have been solved in this software extension. The first one is the coupling between an envelope model and a roof model respecting an existing m2m description strategy, the second one is the linearization of non linear models of the roof components. These modifications of m2m are extremely useful, not only for modelling roof component, but as a general modelling solution for many building components other than simple conductive walls and windows. Due to the limited length of this communication, only the principles of the methods and techniques will be shown.