vapor barriers and sound proofed walls

Old 08-03-01, 06:52 AM
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I'm in the planning phase of my basement finishing project and my question concerns where to put the vapor barriers on sound proofed walls. I live in an end unit townhome and I've read everything I can possibly read on sound proofing. I've decided to construct walls with a staggard stud configuration, 5/8" drywall on BOTH sides and insulation weaved in between the studs. I will be building three walls of this type of construction in an alcove portion of the basement, with only one of the walls being shared by my neighbor (so I don't think I'll have any moisture problems from the shared foundation wall.)

That being said, where do I put the vapor barriers if both sides of my walls will be drywalled? The outer layer of drywall is more for vibration dampening purposes than anything else, but I wouldn't want moisture to build up there either. Would greenboard be of good use for the outer portion of this type of sound proofed wall?

thanks in advance.
Old 08-03-01, 07:05 AM
Join Date: Sep 2000
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You don't need any vapor barrier on a wall or ceiling that is insulated only for sound. The only time you want a vapor barrier is when there is a significant temperature difference from one side of the wall to the other. And in these cases, you only want one vapor barrier -- on the warmer side.

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