Airborne Sound Insulation of a Straw Bale Partition Wall

This paper describes the results of a scientific project focused on determining the Airborne Sound Insulation of a peripheral non-load-bearing wall made of straw bales expressed by Weighted Sound Reduction Index. Weighted Sound Reduction Index was determined by measuring in the certified acoustic laboratory at the Faculty of Mechanical Engineering at the Brno University of Technology. The measured structure of the straw wall was modified in combinations with various materials, so the results include a wide range of possible compositions of the wall. The key modification was the application of plaster on both sides of the straw bale wall. This construction is frequently done in actual straw houses. The additional measurements were performed on the straw wall with several variants of an additional wall of slab materials. The airborne sound insulation value has been also measured in separate stages of the construction. Thus it is possible to compare and determine the effect of the single layers on the airborne sound insulation.

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