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July 9, 2012 | Show All

What is the STC rating of this assembly?

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If I blow a 2x6 stud sound wall with 5/8" rock on both sides what is the STC rating for the assembly? If I need to get to STC 45 will I need a channel on one side?           

 

 

Posted At : 2:53 PM. | Posted By : KRISTIN | Link | | Comments (3)

according to the charts, You will only get an STC of between 39 to 42 with only a single layer of drywall on each side. If you add sound track on one side for decoupling, you jump to a 50 STC rating.

Posted By STEVE MALON / Posted At 7/9/12 3:24 PM

27 points uninsulated wall 14 points add insulation 2x6 wall 4 points double sided sheet rock 2 points each = 45 points no channel added

Posted By MICHAEL AMARO / Posted At 7/9/12 3:56 PM

I concur with Mr. Malon, you would require an RC channel to attain an STC of 45 or an additional layer of drywall. Some of the variables that would affect this rating would be 16" or 24" centers, nailing or screwing the sheetrock (nailing will give you a better rating believe it or not), and of course curing any bridging problems (electrical outlets, caulking top and bottom plates, etc.).

Posted By TERRY ELDER / Posted At 7/11/12 7:49 AM