Acoustics

There are three major ratings that relate to ceiling tile acoustics: Noise Reduction Coefficient, Sound Trasmittance Class, and Ceiling Attenuation Class. Only some tiles are rated in all three categories, and the value of each rating is only meaningful in the context of the actual installation where the tile will be used. It is important to note that these values are achieved in a laboratory, and the measurements are not considered field data. Said another way: "Your results may vary," depending on where and how the tiles are used and what you expect of them.


Noise Reduction Coefficient (NRC)

Noise Reduction Coefficient (NRC) is a general rating that tells you how much sound a surface (in this case a ceiling tile) will absorb. This rating is represented as either a percentage or a decimal, with 1 (or 100%) being perfect absorption and 0 (or 0%) being perfect reflection. In other words, the higher the decimal or percent, the more sound the tile will absorb.

Type Alone With Soniguard™
Stratford NRC.85+™ Acoustical System NRC 0.85 NA*
Stratford NRC.50+™ Acoustical System NRC 0.50 NA*
Feather-Light Ceiling Tile Collection NRC 0.25 NRC 0.50
Signature Ceiling Tile Collection NRC 0.15 NRC 0.30

* Both NRC.85+ and NRC.50+ include Soniguard within the system, thus, we have chosen to represent only its NRC alone (which includes Soniguard).


Sound Transmission Class (STC)

Sound Transmission Class (STC) is used to rate several different types of building materials for their ability to block sound and prevent it from passing through them. Putting appropriate material between you and a sound source can reduce the apparent loudness of the sound. Adding material with an STC of 5 is clearly noticeable and an STC of 10 or more cuts the apparent loudness by 50%. As the STC goes up, the loudness continues to go down.

Type Alone With Soniguard™
Stratford NRC.85+™ Acoustical System TBD NA*
Stratford NRC.50+™ Acoustical System TBD NA*
Feather-Light Ceiling Tile Collection STC 10 STC 13
Signature Ceiling Tile Collection STC 15 STC 18

* Both NRC.85+ and NRC.50+ include Soniguard within the system, thus, we have chosen to represent only its total STC alone (which includes Soniguard).


Ceiling Attenuation Class (CAC)

Ceiling Attenuation Class (CAC) is a measure that tells you how much sound travels up through a ceiling, through a common plenum (the area above a suspended ceiling), and then into an adjacent interior space.

Type Alone With Soniguard™
Stratford NRC.85+™ Acoustical System CAC 9 NA
Stratford NRC.50+™ Acoustical System CAC 20 NA
Feather-Light Ceiling Tile Collection CAC 14 CAC 20
Signature Ceiling Tile Collection CAC 21 CAC 26

* Both NRC.85+ and NRC.50+ include Soniguard within the system, thus, we have chosen to represent only its total CAC alone (which includes Soniguard).

Guiding Principle #5: Be humorous. Even ceiling tiles can be entertaining.