Why is there is no law about using partition walls to separate where people live to reduce noise?

There is. It's called the law of letting you find another place to live if you're not happy with the quality of the soundproofing.

There is on new production in so much states and towns within the US. New condo constructions regularly have partitions designed to be modestly sound resistant. Can't pay attention speakme, however screaming will come by way of. Old production is not anticipated to replace. In a few locations they must replace in the event that they transform. But in so much places they do not must upload sound safeguard each for a transform as it's not lifestyles threatening. The intent is sound safeguard is high priced, and in most cases fails. New production can find the money for to return and redo a few failure earlier than it's used. It is way more high priced to take action after a transform. It is not insulation that does the trick. It is mass and the way good it's sealed. Sound honestly travels very poorly by way of the air. It's desired medium is rough surfaces at a price. Heavy fabric drains the power within the vibration swiftly. So in a poorly sealed wall sound will journey across the drywall into the studs and out into the air at the different part of the wall fully heading off the drywall and insulation. Typically there's a house on the backside of the ground that's protected up through trim, however no longer sealed through production in which it could actually come by way of. It is paper skinny, however that's all it takes. In a good sealed wall sound is pressured to head by way of the drywall, into the stud(heading off the insulation), and again out by way of the drywall. This wall will muffle one other 20 decibels of sound that the above one may not. In an anti-sound wall, that inns and new residences are anticipated to construct in so much places, there don't seem to be any studs that contact either side of the wall. So sound is pressured to head by way of drywall then insulation and yet another layer of drywall to get to the following room.

because you being able to hear your neighbors constantly is not going to put you in any danger.