If your only goal is to reduce noise, I would suggest adding a new layer
or two of drywall.
Check out http://www.soundproofing.org /
In general you want to block air exchange. Air caries sound very well.
(Try opening your car's window as a train is going by.)
Next you want weight. Heavy things (drywall lead sheets etc.) block
You also want to prevent any direct solid connections. Stagger wall
studs or use special isolation devices to keep the sound from traveling
through the wall (remember the two cans on a string (well wire actuarially
worked) you want to break the wire).
Filling in wall cavities with sound absorbing materials (acoustical
fiberglass bats) will do a little.
Point source control (special absorption material) at the source of the
sound will also help.
Hello everyone and thank you for your suggestions. I do understand
that heavier and denser materials will not transmit as much sound as
say, insulation, however none of the other suggestions would be
workable. In addition, I'm just looking for roughly a 50% reduction in
sound transmission with somewhat ease and cost, I believe I can attain
that with a insulation filler.
I really appreciate the other suggestions though.
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