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Window elements are often equipped with external shutters for the purpose of shading a room especially during nighttime. Although it is known that a shading device can have an effect on sound insulation of the overall window construction it is usually not taken into account for a prognosis of sound insulation performance. In terms of enhanced sound protection requirements during nighttime it is desirable to incorporate this effect in design and planning procedures.To investigate this effect a joint research project by ift Rosenheim, TH Rosenheim and HfT Stuttgart was started with support by German „Bundesministerium für Wirtschaft und Klimaschutz“ within the funding program „WIPANO – Normung und Standardisierung“.The project includes experimental, numerical and theoretical methods for assessment of the improvement on sound insulation of window elements by external shutters. Measurements of airborne sound insulation of window elements with and without external shutters were done in the acoustic test stand of ift Rosenheim. A variety of roller shutters with different mass per unit area, different cross sections and materials varying from plastic and aluminum to wood were combined with window elements featuring different glazing configurations.Within this paper first results and analysis of experimental investigations are reported. Measurements show a strong dependence of sound insulation of a combined element on the distance between roller shutter and glazing. Additionally, the influence of other constructive parameters (e.g. glazing configuration, mass per area of roller shutter and sealing of the shutter to the guide rail) on sound insulation were investigated and first results are presented within this paper.