Generally it may be difficult to totally eliminate all sound. The increasing degrees of sound proofing would require more materials but typically glass mineral wool and a plasterboard encasement suffices. Plastic Pipes and Acoustic Attenuation Consider a 110 mm sewage pipe made of PVC with a water velocity of 1.5 litres/sec. The sound level measured 0.6 meters from the uninsulated pipe was = 56 dB(A). A plastic pipe should be insulated with 20 - 30 mm mineral wool to get the same noise attenuation levels as for cast iron pipes.
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