Sound proofing new residential

Good old fashioned fiberglass batts seem to do pretty well, and are likely to be as cheap a solution as you're going to find.

SAB, Sound Attenuating Blankets, which are slightly denser than standard glass fiber batts are a start.

Look at Flanking Paths: electric boxes back to back within a stud space, gyp board not sealed at the edges, ducts that give a path from space to space.

In that regard, one of the most effective techniques, albeit somewhat more expensive is to use 2x6 baseplate w/ alternating 2x4 studs so that there's a break between the two walls.

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Not really.. but here are some old faithfuls:

Kay

Them better be some stout walls and floors, thats got to be heavy.

Sound reducing drywall.

on 7/14/2008 1:24 PM snipped-for-privacy@cox.net said the following:

I have vinyl siding over 3/8" foil faced polystyrene panels over the plywood sheathing, 2x4 walls with fiberglass bats, plastic vapor barrier, and 1/2" sheetrock. I can't hear vehicles going up and down my street about 90 feet away. The only time I know I have visitors pulling into my driveway is when the yorkie barks, or the people ring the door bell. If I had my druthers back then, I would have had them put in 2x6 studs for better heat insulation. That might have helped my fuel oil bills today.