Sound Barriers: Absorptive vs. Reflective
Sound Barriers: Absorptive vs. Reflective
We&#;ve all seen sound barriers or sound walls along highways, neighborhoods, construction sites and many other noisy areas. They&#;re normally concrete, wood, plastic or even vinyl blankets.
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Most are quite effective at reducing highway noise, construction noise and many other forms of noise pollution. But depending on their properties, they could be causing more problems than they&#;re fixing.
This article will discuss the properties that should be considered when shopping for one of these sound barriers, specifically reflective vs. absorptive properties.
Firstly, we would like to say that the best sound barrier has both absorptive and reflective properties.
A sound barrier&#;s performance is measured in two ways. One is Sound Transmission Class (STC), and the other is Noise Reduction Coefficient (NRC). STC measures the amount of sound that passes through the wall or barrier while NRC measures the amount of sound the barrier actually absorbs vs. the amount of sound that is reflected.
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A STC rating of 30 or more means that 0.1 percent of the sound reaching the barrier passes through. If the barrier is not absorptive though, 99.9 percent of the sound is reflected. We&#;ll explain in a moment why that isn&#;t always a good thing.
Many state departments of transportation require STC ratings in the range of 24 to 32.
An NRC rating is between 0 and 1. If a barrier has an NRC rating of .85, it means that 85% of the sound reaching the barrier is absorbed and 15% is reflected.
A good sound barrier is a sound-absorbing wall with a STC rating of 30 or more and a minimum NRC rating of .85.
For more information, please visit Noise Barrier Panel.