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Old 04-21-2012, 11:40 AM   #1
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Drywall over plywood


Need advice:

I live in a house where my living room wall is right up against my neighbors wall (very common in Sam Francisco). I would like to make my living room wall a little more sound proof so I won't bug my neighbor and currently the wall only has plywood. I read somewhere that adding a piece of drywall over it will help. Any truth to it?

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Old 04-21-2012, 12:22 PM   #2
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It should be done if the wall only has plywood, especially for fire ratings. Will not stop sound, unless you use Green Glue between the sections.

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Old 04-23-2012, 09:47 PM   #3
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We used this...

http://www.nationalgypsum.com/produc...9%2000-173.pdf

on a project and it worked very well. It is basically a panel that is assembled at the factory with a layer of material similar to the Green Glue that gregzoll mentions sandwiched between 2 sheets of drywall. Finished thickness is 5/8.
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Old 05-29-2012, 06:09 PM   #4
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Better and cheaper to use two sheets of standard 5/8" drywall and a field application of damping compound. You want all the mass you can get and pre-damped specialty drywall are lightweight.

Also drywall from Home Depot is $7 a sheet.
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