The invention relates to a multilayer building panel (100) having thermal insulation properties. Such panel comprises: - a main layer (1) in an insulating material comprising a first surface (10) and a second surface (20); - a first reinforcement layer (2) connected to the main layer (1) along the first surface (10); - a second reinforcement layer (3) connected to the main layer (1) along the second surface (20). The panel is characterised in that one between the first (2) and second (3) reinforcement panels comprises a layer manufactured in polymeric material.
