sound dampening

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Old 03-31-08, 07:23 AM
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sound dampening

the wall my tv will be next to in my basement has the A/C and boiler on the other side. would it be better to fill the wall with insulation or just fill the space with multiple layers of drywall. (was thinking i could just do multiple layers with alll the scaps i have left from the other walls). not tryig to sound proof it just want to deduct as much as possible.
 
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Old 03-31-08, 08:01 AM
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the multiple layers will probably do a better job of muffling the sound. I insulated my recent basement remodel with 6 inches of insulation between the first floor and the basement, hoping for some sound dampening.... Not much help!! My 4 year old dancing to Mary Poppins upstairs sounds like a herd of elephants.....
 
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Old 03-31-08, 11:11 AM
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My 4 year old dancing to Mary Poppins upstairs sounds like a herd of elephants.....
But what type of floor is she dancing on? IF she's tap dancing on a hardwood floor then you have other issues to deal with, and no, insulation will not help that. If you just hear the thumping of her feet, it's probably due to the floor flexing, and again, you have other issues to deal with.

The right question is, can you hear her talking? That should be the sound you are trying to stop.

To the OP, since the wall is already open (I'm guessing from your post), do both. Use regular old pink stuff and do not "stuff" it in there, just enough to fill the space. Then double drywall (more masss = better, 5/8 better than 1/2). These are the things that are easy to do while building, hard to do after the fact and provide the best bang-for-the-buck.

After that, your most likely cause for concern wil be "flanking noise" escaping around and through other openings (around doors, unsealed top or bottom plates, through HVAC vents, etc) into your room.

Good luck,
Tom
 
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Old 03-31-08, 11:15 AM
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Good points Logan.... and, you're correct... Can't hear her talking, nor the music playing.... just her feet tap dancing on the newly laid refurbished hardwood floor.... Other than isolating the basement ceiling, which wasn't an option... I guess I'll just have to make sure she isn't dancing while I'm watching "Holmes on Homes"... LOL....
 
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Old 03-31-08, 12:00 PM
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There is out a 1/8" foam sheet like that you put down first. Then the hard wood floor. Helps stop the noise fron the floor above some. On the wall to the boiler room . Id use a R 13 insulation. Press tight with no paper and dont drywall the furnace room let the insulation open to it. If you do want to seal the wall there . Use a 2X6 for the bottom and top plate.Use 2X4 for the studs 24" center on one side of the wall and another 2X4 studs set 24" center for the boiler room 12" off the other wall studs. This way the drywall in one room is not on the same stud. As the drywall for the other room is. zig zag the insulation between them . This is the way we do condos.
 
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Old 03-31-08, 12:28 PM
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Originally Posted by Ed Imeduc View Post
This way the drywall in one room is not on the same stud.
That's the secret. 'Cause sound (vibrations) transfer through the lumber otherwise. In your case Necjeb studs on utility room side could be 2x3.
 
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Old 03-31-08, 01:21 PM
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sound dampening

Staggered studs, as Ed suggested, can be very effective. the only problem you have on a short wall is the ends and corners.

The pink junk is worthless for sound. Try rock wool (Roxall?) batts. It is much more effective if you can get it locally.
 
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Old 03-31-08, 03:16 PM
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I recently went thru this for a customer doing a basement under a living room. Researched sound insulation, very expensive and you had to order large quantities(far too much for this job), no one stocked anything. Quizzed Owen-Corning about their sound insulation saying that no one stocked it. They said, use standard insulation. I suggested that I had read elsewhere that that did not work, they said use regular insulation. I did(filled the joist bay with unfaced) but the job is not done, time will tell. But I hope my customer doesn't.
 
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Old 03-31-08, 04:08 PM
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No honest company sells "soundproofing" because, like Ed Imeduc told us, it's more about how we build than what products we buy. The guys who sell 2x4s aren't up to hawking their lumber as advanced soundproofing technology - though, used intelligently, that's just what 2x4s may be.

Sound is vibration. So we build to decouple everything that would transmit vibrations. Padding voids can be done as an afterthought.
 
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Old 04-01-08, 06:55 AM
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The pink junk is worthless for sound
I think we need to agree to disagree here. Here's a real world example, right in this thread.

thezster says:
I insulated my recent basement remodel with 6 inches of insulation between the first floor and the basement, hoping for some sound dampening.... Not much help!!
but then he says....
Can't hear her talking, nor the music playing
I based my comments on reading the experts at AVS. I'm still building my room, but that is exactly what I plan to do, along with several other recommendations. Based on their advice, there are diminishing returns for using pink stuff insulation in ceilings beyond R19. Using roxul should work better, in theory, but doesn't in reality. Using MORE pink stuff should work better in theory, but doesn't. Same for "sound board" versus regular old drywall, regardless of what its manufacturer tells you. More mass IS better, so 5/8 DW IS better than 1/2. And 2X DW is better than one.

Good luck,
Tom
 
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