Resilient underlayments are commonly utilized as a primary method of reducing footfall noise in architectural acoustics. Although resiliency is a large component of a partition’s footfall performance, as well its ability to achieve higher AIIC ratings through ASTM E1007 AIIC testing, adding resiliency alone does not always address all of the frequencies which cause disturbances due to footfall. Particularly in lightweight construction, the density of the configuration is also a critical component of a successful solution. Due to the lack of sufficient mass in lightweight construction materials, successful treatment for impact noise disturbances in lightweight conditions becomes more difficult to achieve. This paper compares data with different flooring configurations in mock-up ASTM AIIC testing conditions in order to evaluate advantages and disadvantages of ANISPL (Absorption Normalized Impact Sound Pressure Level) performance in different frequencies. Resiliency and density are added in varying combinations in a wood frame construction in order to better understand their relationship to AIIC ratings and a partition’s success in impact noise insulation.
Impulsive sounds, such as balloon pops or the slapping of wood boards, are utilized by acoustical consultants in order to measure the reverberation time (T60) for residential applications with room volumes typically less than 150 cubic meters. However, these methods are not approved for measurement of the T60 for utilization in ASTM E336 ASTC and E1007 AIIC testing commonly practiced. Instead, the ASTM measurement of T60 requires a large loudspeaker and gated noise in order to gain performance in the low frequencies. Utilizing gated noise requires additional equipment to be carried in the field for AIIC and general T60 testing, making it a less attractive option for acoustical consultants. This paper compares T60 data collected utilizing various signal sources such as gated noise, balloon pops, and wood slaps at various source and receiving locations in rooms of varying volumes in order to compare the performance of various T60 measurement methods for use in ASTC and AIIC testing.
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