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Old 03-16-2012, 04:32 PM   #1
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Commercial Soundproofing


I have a commercial office with soundproofed wall and suspended ceiling. Above the suspended ceilign is a 3' high area where knee walls were built, insulated, drywalled and taped for soundproofing. However there are many voids around ducts and below knee walls where sound is escaping to other rooms.

Im planning on using roxul right on top of the suspended ceiling but am worried about covering lights (fire? although roxul is fire resistant) and open grills in the ceiling. Are the open grills used as a return air? Air entering the room comes in ducts.

Any help would be appreciated.

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Old 03-16-2012, 06:59 PM   #2
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Commercial Soundproofing


Quote:
Originally Posted by ordonyez View Post
...there are many voids around ducts and below knee walls
Any help would be appreciated.
Unless you OWN the space don't do anything more than to seal those gaps.
Fire stop caulk and aluminum faced duct tape. No more.

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Old 03-16-2012, 08:43 PM   #3
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Commercial Soundproofing


Talk to (ask those questions) at your local Building Dept & Inspectional services.

There are many factors and commercial codes that can be affected, as the previous poster stated.
Commercial and multi-unit codes are NOT the same as residential codes.

In addition, you can insulate all you want to try and reduce sound, but it can, and will, travel through anything metal, anything loose and unsecured within walls & ceilings, including other utility lines and certain installed materials.

"Sound-proofing" is a misnomer. Most building materials will transfer sound. The thought process is to reduce sound transmittance = "sound reduction". That is most often done by creating "layers" of materials that can act as chambers or baffles, which change the way sound waves travel.


BTW - Ruxol is fire resistant and can be placed in contact with duct-work, lighting, chimneys, etc.

More Information Here: http://www.roxul.com/home
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Old 03-17-2012, 06:48 AM   #4
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Commercial Soundproofing


I think you have some good replies here. Generally ceilings lack mass. Some place drywall squares above the ceiling grid on the back of the existing tile
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