What Is the Noise Reduction Coefficient of Gypsum Board?
May 22, 2026
The noise reduction coefficient (NRC) of standard gypsum board usually ranges between 0.3 and 0.5. It measures sound absorption, not sound blocking—which is expressed through the STC rating instead. TRUSUS acoustic insight: NRC is about how sound dies inside a surface, not how it stops at the wall. NRC captures how much echo or reverberation […]
