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Quick question for Sound Barrier Help

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4 replies to this topic

#1 of 5 OFFLINE   Sparks



  • 45 posts
  • Join Date: Apr 01 2009

Posted November 27 2009 - 01:56 AM

Just a quick question for you guys who have possibly used this.... I am almost done with wiring and about to put up the sheet-rock. I am trying to see what would be better to use for sound deadening the room. I have seen a product at Home Depot that a salesperson showed me that is supposed to deaden the sound tremendously, and I am wondering if anyone has used it.

It is a Fiber board material 1/2" Thick. I had planned on putting up Double Sheetrock, but am wondering if this would be better to use as one of the layers. I just want to quieten the sound from going upstairs. I am not worried about totally stopping it because I know that would be hard. I plan on putting insulation inbetween the joists first, and then the 2 layers of sheetrock or whatever.

Thanks for any advice.

#2 of 5 OFFLINE   Brutusab



  • 11 posts
  • Join Date: Nov 27 2009

Posted November 27 2009 - 01:53 PM

The Fiber board will work, but it is probably more expensive.  If you are doing double drywall, i would put spacers between the two sheets, it works much better.  Another suggestion is using RC channel.  This is placed on either the studs horizontally or on the first sheet of drywall.  By doing this, it will be somewhat like having a Stagered stud wall.  This is good for walls shared with the rest of the house.

#3 of 5 OFFLINE   wiredawg



  • 14 posts
  • Join Date: Jun 27 2009

Posted November 30 2009 - 06:07 AM

Do a google search for green glue. Everything I have read indicates it is the best option if you are using 2 layers of sheetrock. It seems to dampen vibrations so they don't transfer to the second sheet.

#4 of 5 OFFLINE   Nathan Stohler

Nathan Stohler

    Second Unit

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Posted December 11 2009 - 01:05 AM

I don't know if this post comes too late, but when I built my theater, I used Roxul mineral wool insulation (4" thick in the ceiling and 3" thick in the interior wall), and I think it does a great job.  In fact, the only reason I hear anything upstairs is because of sound carried by the HVAC ducts.  Obviously, if you crank the volume, bass is still going to travel through the rest of the house, but that's where something like a Z-channel or RC channel or "room within a room" comes in.

Here's a picture of the Roxul insulation I'm talking about.  I ended up ordering it from a local building-supply company, as I was unable to find it at Menards, Home Depot, etc.

Posted Image

#5 of 5 OFFLINE   Ted White

Ted White


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  • Join Date: May 16 1999

Posted December 11 2009 - 01:32 AM

The fiberboard materials really don't add / do much. They are too dense to adequately decouple, and are also too dense to provide much absorption. Mineral fiber will perform as well as standard fiberglass in a wall or ceiling cavity. Not advisable at all to introduce spacers between drywall. We only want one air cavity. Never two. Best to decouple with framing (staggered or double stud), simple R13 fiberglass in a wall, double 5/8" drywall and then damp the drywall.
Ted White

The Soundproofing Company

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