To find out which Armstrong ceilings offer the best soundproofing properties, look for the Acoustics rating listed for each ceiling product on the Specifications tab.
NRC is a rating that tells you how much sound a surface will absorb. In practical use, a ceiling NRC rating of 0.50 indicates excellent sound absorption. Compare that to drywall, which typically rates a .05
CAC rates a ceiling’s efficiency as a barrier to sound transmission. In a suspended ceiling chosen for acoustic performance in a basement, the panels prevent most sounds from passing through the ceiling and traveling upstairs. A CAC rating > 35 indicates high performance, meaning little sound is transmitted through the panelsLearn About Sound Control