Stc Floor Rating Chart

Sound transmission class stc is an integer rating of how well a building partition attenuates airborne sound in the usa it is widely used to rate interior partitions ceilings and floors doors windows and exterior wall configurations see astm international classification e413 and e90.

Stc floor rating chart.

Iic impact isolation class astm e492 e989 and stc sound transmission class astm e336 e413 are both tests for sound traveling through the total floor ceiling assembly from an upper living area to a lower living area. This is usu ally because there is a pronounced dip in the test curve and the stc rating is heavily influenced by a measurement in one fre quency band. Sound transmission class stc a commonly used measure of soundproofing effectiveness is the sound transmission class or stc it is a single number that attempts to characterize the overall ability of a material to reduce the transmission of noise. In the us it is widely used to rate interior partitions ceilings floors doors windows and exterior wall configurations.

The standard requires a minimum laboratory stc rating of 50 for party walls and floor ceilings. Sound transmission class stc ratings solve that problem by giving a single value to acoustical performance for a door. 5 or 6 points in laboratory stc ratings for essentially similar assemblies. Impact sound complaints are common on floor ceiling assemblies that meet the bare minimum requirement of 50 decibels iic.