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Old 04-23-2008, 08:48 AM   #1
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How to properly install Roxul soundproofing wool?


Does anyone know the best way to install Roxul Soundproofing wool?
We have workers installing it for us right now, and it looks like they may be trying to rip us off by not using very much batting
We are having a basement room renovated. How much space (min? max?) should there be between the wool and the floor above? How packed should the wool be? and should we worry about tightly sealing any gaps in between the pieces of wool batting?
Thanks a lot!

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Old 04-23-2008, 10:34 AM   #2
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How to properly install Roxul soundproofing wool?


Installation of any sound-proofing or sound-attenuation material requires a tight and complete insertion of the product. (Example: When installing acoustic-rated sheetrock, acoustic sealant is to be used at all floor and ceiling connections, as well as around all electrical and lighting boxes. This creates a complete seal of all possible gaps in the wall's surface materials).

The same is true when installing thermal-rated insulation.

Now, regarding the gaps in the wall's thickness: The Roxul may not have the same thickness as the wall cavities. So a space may exist between the floor sheathing and the insulation, creating an "air chamber". Leaving an air chamber can actually aid in sound reduction. Sound reduction is about "changing sound waves". Air chambers help to accomplish that.

As far as leaving gaps "around" or "between" the acoustic insulation - that pretty much defeats the purpose of it's application. It should be snug to creat a complete "barrier" within the wall of the two room/floor level - spaces you are trying to isolate.


You can review the illustration at the end of this link:
http://www.a-ztech.on.ca/insulation3.htm

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Last edited by AtlanticWBConst.; 04-23-2008 at 10:55 AM.
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Old 04-23-2008, 10:41 AM   #3
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How to properly install Roxul soundproofing wool?


Thanks for your response. At this point they have already cut and placed the pieces of wood between the ceiling joists, but it doesn't look "tight", do you think we can cut thin slices of wool to fill in the gaps, or would they have to start again?....
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Old 04-23-2008, 10:57 AM   #4
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How to properly install Roxul soundproofing wool?


They can cut smaller peices to fill in the gaps. As long as it is "snug", you are accomplishing the creation of a "solid" barrier and separation of the areas.
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Old 04-23-2008, 11:00 AM   #5
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How to properly install Roxul soundproofing wool?


thank you! much appreciated!
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Old 04-23-2008, 11:46 AM   #6
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How to properly install Roxul soundproofing wool?


We have just installed Roxul soundproofing between ceiling joists, (as snugly as we could), but we can still hear everything (!) upstairs.... any ideas on what to do before we put the drywall up?

Thanks!
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Old 04-23-2008, 01:32 PM   #7
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How to properly install Roxul soundproofing wool?


Quote:
Originally Posted by renogirl View Post
We have just installed Roxul soundproofing between ceiling joists, (as snugly as we could), but we can still hear everything (!) upstairs.... any ideas on what to do before we put the drywall up?

Thanks!
There are other ways that sound can be transmitted in a home.

Recent Discussion. I posted links on this thread that explains sound transmission and other ways to reduce sound:

http://www.diychatroom.com/showthrea...012#post118012

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