A 4 x 8 sheet made from post-recycled products is placed on your existing wall and requires a minimum existing drywall that is at least 3/8 inch thick. You simply hang the product, align the seems, spackle the seams, then finish the wall.
The manufacturer claims that the dB2-4walls can reduce airborne and structural noise up to 75% between rooms. Their acoustical tests show a standard wall with wood Studs 2” x 4”, 16” on center, and with 5/8" drywall went from an STC of 34 to 39 or a reduction of 8db above 200 HZ. Keep mind that these tests are done in a laboratory, so most likely you will not be able to achieve the same results.
You might be saying that 8db is not much, but be aware that each three decibel increment affects a 50% change in sound pressure levels. Thus, a 3 dB drop reduces sound exposure by 50%, while a 6 dB drop reduces exposure by 75%. Though reducing the decibel level produced by a sound source from 80 to 77 may not seem like a major change, it would actually represent a 50% reduction in audible sound.
You can visit the manufacturers site here.
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