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Description
The current version of the German standard for sound insulation in buildings, DIN 4109, explicitly takes into account the external noise level at night. If the external noise level at night is no more than 10 dB lower than during the day, the required sound insulation is based on the relevant external noise level at night. In this case, a surcharge in sound insulation of 10 dB must be taken into account in bedrooms due to the increased disturbance at night. For such external noise situations, temporary sound insulation in form of an external enclosure can be an economical solution if the existing roller shutters provide an improvement instead of expensive soundproof windows.As part of a research project conducted jointly with Rosenheim University of Applied Sciences (HS Rosenheim) and the Rosenheim Institute for Window Technology, (ift Rosenheim) the sound reduction of various combinations of glazings and shutters was determined in the laboratory of ift Rosenheim. Several parameters e.g. the distance between the glazing and the shutter, the surface-related mass of the shutter, the type and the sound reduction of the glazing and the airtightness of the shutter were identified as most important for the airborne sound improvement. To implement the experimental findings in the German standard DIN 4109 a simple calculation procedure with single number quantities has to be developed.