The new DIN 4109 standard deals with a number of factors that influence sound insulation in buildings, including requirements, verifications, and safety concept. Rooms are divided into several groups by the standard to determine requirements for sound insulation. The revised standard also requires to determine the significant direction in case of asymmetric situations. It requires to determine
... [Show full abstract] the significant direction as geometric properties of the receiving room have an impact on the weighted standardized sound level difference. The significant direction of sound transmission always points from large to small and from noisy to silent rooms. The level of requirement is kept unchanged in comparison to the earlier version of the standard. Another new provision of the revised standard is the new calculation model for the verification of sound insulation in buildings.
