One of the biggest noise problems in houses comes from water systems. Specifiers can sometimes face a challenge to reduce noise from pipes in new constructions as can those who buy homes with pipes made from materials that do little to insulate noise.
Manufacturers can often fool specifiers when it comes to acoustic levels in pipes by disguising their actual performance levels. Add to this the drive to reduce building costs and the level of soundproofing around pipes can be less than ideal.
Plastic based systems are the worst culprits for noise and ironically the old cast iron pipes they replaced still offer the best sound insulation than their cheaper alternatives. Moreover, opting for plastic based systems can end up costing more in extra insulation costs where additional materials need to be purchased to compensate for the extra noise.
According to those in the industry current standards of testing sound insulation in water pipes are not stringent enough to replicate the sound generated under normal usage conditions.
Reducing noise from pipes in an existing house is a different matter of course. It can be a major job to replace a water system therefore one option is to use acoustic heavy sound proofing in the ceiling, which can reduce noise by up to 25 db. By using glass wool and an enclosure constructed from gypsum board, it is possible to reduce the level of noise by up to 30 dB(A) in walls.