Why STC Doesn’t Tell You Everything

March 1, 2005   
The sound isolating properties of wall and floor/ceiling assemblies are often presented using a single number rating system, the Sound Transmission Class (STC). The STC rating of a partition is determined by following an ASTM Standard which compares the sound

Acoustical Terms – What Are They/What Do They Mean?

June 1, 1993   
Recently we were asked “What is the difference between STC, NRC, and NC and are they interrelated?” STC or Sound Transmission Class, describes how much sound a wall or a floor/ceiling construction will block from one room to the next.