Skip to main content
Add as a preferred source on Google

Controlling Noise in Classrooms

Acoustical performance is a vital ceiling selection criterion for classrooms. The reason: students must be able to hear and understand their instructor if they are to learn.

In the past, acoustical ceilings offered either good sound absorption to decrease unwanted sound levels, or good ceiling attenuation to block unwanted sound intrusion from adjacent classrooms or corridors, but not both absorption and blocking in the same ceiling.

Now, the science behind the ceiling is able to offer a new generation of acoustical ceiling panels that provide an ideal combination of sound absorption as denoted by their Noise Reduction Coefficient (NRC) and sound blocking as denoted by their Ceiling Attenuation Class (CAC) in the same panel.

The NRC indicates the ability of a ceiling to absorb sound. It is expressed as a number between 0.00 and 1.00, and indicates the percentage of sound it absorbs. An NRC of 0.60 means a ceiling absorbs 60 percent of the sound that strikes it. A ceiling with an NRC less than 0.60 is considered low performance, one with an NRC of 0.70 or greater, high performance.

The CAC indicates the ability of a ceiling to block sound in one space from passing up into the plenum and transmitting back down into an adjacent space that shares the same plenum. The higher the number, the better the ceiling acts as a sound barrier. A ceiling with a CAC less than 25 is considered low performance, one with a CAC of 35 or greater, high performance.

Regardless of whether it’s new construction or renovation, the best solution for both reducing the level of sound in a classroom and limiting sound intrusion into it is an acoustical ceiling panel that combines an NRC of 0.70 or greater and a CAC of 35 or greater.

This article originally appeared in the issue of .

About the Author

Sean Browne is principal scientist - Global Acoustics for Armstrong Ceilings.

Featured

  • California District Debuts New High-School CTE Center

    The West Sonoma County Union High School District (WSCUHSD) in Sebastopol, Calif., recently held a ribbon-cutting ceremony for the new CTE Center at Analy High School, according to a news release. The district partnered with Quattrocchi Kwok Architects (QKA) for the facility’s design and GCCI for its construction, and funding came from local Measure A bond funds.

  • Western Kentucky University Breaks Ground on First Phase of $350M Student Housing Project

    Western Kentucky University (WKU) in Bowling Green, Ky., recently broke ground on the first phase of a $350-million student housing initiative, according to a news release. The university is partnering with Gilbane Development through a public-private partnership (P3) to replace aging residence halls and modernize on-campus living accommodations.

  • UPenn Announces Completion of New Veterinary Education Facility

    The University of Pennsylvania in Philadelphia, Penn., recently finished construction on an 11,800-square-foot veterinary education building, according to a news release. The Gail P. Riepe Center for Advanced Veterinary Education is the first dedicated classroom facility at the New Bolton Center, a large-animal hospital and campus about 35 miles west of the campus proper.

  • DLR Group Announces New Mid-Atlantic Higher Education Leader

    Integrated design firm DLR Group recently announced that it has promoted Principal Shawn Gaither, AIA, LEED AP, to the role of higher education leader in the Mid-Atlantic, according to a news release. Gaither has served with the firm for more than 20 years, most recently as the national higher education business development leader.