Stc Floor Rating Chart

Stc is determined by a weighted average of tl values taken over 16 frequencies which are fitted to a curve in a method defined by the astm e413 classification standard for rating sound insulation.

Stc floor rating chart.

Impact sound complaints are common on floor ceiling assemblies that meet the bare minimum requirement of 50 decibels iic. The standard requires a minimum laboratory stc rating of 50 for party walls and floor ceilings. Outside the us the sound reduction index sri iso index is used. Sound transmission class stc ratings solve that problem by giving a single value to acoustical performance for a door.

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. 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 or stc is an integer rating of how well a building partition attenuates airborne sound. 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.