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Method of predicting Composite Sound Transmission Class rating of composite wall assemblies that do not extend to deck

Predicting the sound transmitted through a partition can be very difficult because of the range of unknowns. Typically, Sound Transmission Class, STC, data provided by vendors is available to select the appropriate wall or floor/ceiling assembly. However, when partitions are made of multiple building elements, the difficulty increases. Calculating the area of each element and having an STC rating for each element allows the Composite STC rating to be calculated from the total area divided by the Total area times the transmission loss coefficient. The larger the STC rating, the smaller the Transmission Loss Coefficient. Thus, even small areas with very low STC ratings diminish the Composite STC rating. For a wall partition that stops 15 cm above the ceiling, the area and STC rating of the common area must be included in the calculation. This means that the area of the ceiling, the penetrations of the ceiling, and the area from the top of the partition must be computed. A method has been developed to account for all the paths between two spaces that provides a good estimate of the Composite STC/NIC rating of any partition. Examples and details will be provided.