Adding insulation will help some. How much depends on what kind of
sound and where it comes from.
Generally insulation, even insulation designed to absorb sound does not
For the sound of people or animals walking, carpet would be a good
choice. To quiet a bed room over the TV viewing room an extra layer of
drywall on the ceiling would do much more.
Take a look at:
http://www.soundproofing.org/ for some ideas, or other sources.
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 actually
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.
Joseph E. Meehan
26 + 6 = 1 It's Irish Math
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