Cushioned Floor

I. The resistance to sound transmission of a floor asscmblv is measured in j two ways. Resistance to the transmis-sion of airborne sound is expressed in decibels as a sound transmission class (STC), the same as for partitions. Resistance to the transmission of impact noise is expressed in decibels as the impact insulation class (IIC). Both of these quantities need to be controlled through detailing to achieve the desired acoustical performance. The accom panying table gives recommended minimum STC and IIC values for residential floors in a varietv of situations;

higher values than these arc desirable. Because background noise masks the intelligibility of sounds, floor/ceiling constructions of lesser acoustical quality are considered acceptable in noisier neighborhoods. D>

SELECTED SOUND ISOLATION CRITERIA FOR FLOOR/CEILING CONSTRUCTIONS BETWEEN DWELLING UNITS

Very Quiet Average Very Noisy

Neighborhood Neighborhood Neighborhood

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