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 Sound Barrier

Acoustic. Sound Barrier

Sound barriers are high density layers that reflect air borne noise backwards towards the source.

In contrast to sound absorbers which reduce the sound power level, barriers reflect noise but do not reduce the energy carried by the sound wave.

Barrier materials are high density materials that reflect most noise that hits them. As sound waves hit the barrier most of their energy is reflected backwards.

Unfortunately a percentage of the noise will always pass through a barrier. This is why barriers should be used with absorbing foams.


 

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        <i class="icon-chevron-right"> What materials are suitable as sound barriers?
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        <p>The higher the mass of a layer, the more effective it becomes at preventing the passage of noise. Mass is the relation of thickness and density so the most effective barrier would be a thick layer of a high density material. </p>
<p>Historically lead was used as an acoustic barrier due to its high density. Today modern non-toxic barriers are more often used instead. </p>
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        <i class="icon-chevron-right"> If a material is flexible can it still be a sound barrier?
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        <p>Yes.</p>
<p>The most important characteristic that determines sound barrier performance is the overall mass of the layer. A material can have a very high mass and still remain highly flexible. </p>
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        <i class="icon-chevron-right"> Should I use sound barrier materials or sound absorbing materials?
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        <p>A comprehensive acoustic treatment uses both high density barriers and absorbing foams. </p>
<p>Barriers are used to build acoustic enclosures or to otherwise encapsulate noise sources. The effect of this is, however, a build up of noise inside the enclosure as the waves are reflected without attenuation. </p>
<p>Lining the inside of the enclosure using a sound absorbing foam reduces the noise level within the enclosure. </p>
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        <p>The effectiveness of a sound barrier is measured by testing against EN ISO 140-3. This test gives results for each octave frequency that state the dB reductions that would be obtained by applying the sound barrier. These dB reductions are often combined into a single figure - the &#39;Rw value&#39; - by comparing actual test results against a set of pre-defined reference curves. </p>
<p>Due to the way that Rw values are calculated two products may share the same Rw but have greatly differing sound barrier performance. </p>
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How do high-mass barriers stop noise?

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