Quote:
Originally Posted by lachlanholmes
More critical to sound-proofing (in a formed concrete building) is what is between the units.
In my current apartment, there is a formed concrete shear wall on one side, and the sound just doesn't travel from that unit next to me. On the other side, there is no shear wall, just a basic non-load bearing interior wall and you can hear everything happening in the apartment on the other side of it — you can pretty clearly hear entire conversations being held at a regular speaking volume.
Similar story with my previous apartment, formed concrete shear wall between the apartment next door, but non load-bearing interior wall between the back of the dining room and the bedroom of the apartment behind. The sound travelled like mad in that portion.
This is a big reason I'm a fan of formed concrete construction, specifically formed concrete walls between units. Makes a huge difference.
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Our sound proofing requirements here are so lax. In many Nordic countries they are far more strict. Between units some countries will require or some developers will voluntarily use 2 layers of 5/8 drywall, with staggered studs, and soundproof and fire proof rock based insulation. That plus properly filling spaces in corners, around utility boxes and other sound dampening helps a lot. Most times here it's just a metal stud interior wall with a single layer of 5/8 fireproof drywall on each side, maybe pink insulation. It's trash.
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