Soundproofing Multifamily Silence Technology

Do you remember when you were a kid, and the closest thing you had to a cell phone was two cups with a string pulled taut between them, speaking into one cup to see if your friend holding the other could hear you? That long-ago game worked because sound travels along rigid pathways. If you let the string between the cups go slack, the sound didn’t travel. That’s the fundamental science behind soundproofing – and you’d already learned it in kindergarten.

The ABC’s of Sound – and Soundproofing

Sarah Marsh, President of  MAAI Marsh Architects in New York City, says: “There’s no such thing as soundproofing; rather the proper term is sound attenuation.” Sound attenuation is the effective reduction of sound – not necessarily its elimination.

Michele Boddewyn and Alan Gaynor, President and Founding Principal, respectively of the New York City firm Boddewyn Gaynor Architects, explain that noise in multifamily buildings can be broadly divided between two general categories: airborne noise and structural noise. Airborne noise filters in from adjacent units and outside. It includes things such as music from a stereo, raised voices, or the rumble of the garbage truck at 6:30 on a Saturday morning. Structural noise has to do with reverberations that come through the actual building structure – so the reviled ‘footfalls’ of your upstairs neighbor’s children and her high-heeled shoes clacking against the floor at the same time every day count as structural noise.

Solutions for these different types of noise vary in approach. In reality, the underlying science behind the solutions is pretty much always the same: relax the string.

An Unintentional History

Urban multifamily housing can be pretty much divided into three categories as far as sound is concerned. The first period stretches from World War I through the pre-World War II construction boom, and then on to the mid-1960s, when construction methods began to change for both economic and technological reasons. The second period covers the years from the late 1960s and early 1970s through the early 1990s. The third period goes from the 1990s to the present. 


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  • Good article except for one comment. The comment ‘glass does not act as a sound reduction agent in any way’ is inaccurate. Glass is a sound barrier material, much like plywood, drywall, concrete, mass loaded vinyl etc. Are ‘sound barrier materials’ that reflect sound and ultimately reduce sound (at certain frequencies / levels) from transmitting through that given assembly. In Toronto, many new buildings / homes are very modern and utilize glass in their designs for exterior and interior purposes. Also, Recording studios utilize glass between the control room and studio / vocal booth - chances are... if you believe that glass has zero noise reduction qualities, then it’s the frame and / or mullions that are the problem.