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California Green Building Code 2010 - Sec. 5.714.7.4.3 - Interior sound transmission

P

PaulJi

Member
Joined
Apr 22, 2013
Messages
7
Location
Ashland, Oregon
The CGBSC 2010 requires an STC 40 for floor-ceiling assemblies between tenant spaces in a project I'm working on.

The situation is the existing building has only 3/4" T&G subflooring and Open web trusses (TJS's at 24" oc.)..without ceiling or carpet etc.

The City Plan Reviewer asked for a floor-ceiling assembly from a lab test report and would accept an assembly in the Gypsum Association's manual.

My contractor states: "I don’t understand the difference between an assembly that consists of joists with a plywood surface above and ACT below, regardless of whether it occurs at a roof or a floor. Why would the exact same assembly have a different STC rating?" in other words what is the difference between an STC rated floor-ceiling assembly and an STC rating of a ATC ceiling that one adds below a structural system with a subfloor.

Obviously the contractor would rather not provide a floor-ceiling assembly with carpet/padding/plywood or (lightweight concrete) /RC channels and drywall in addition to an ACT lay-in ceiling which by itself has an STC rating of 40.

Is this an code requirement that one could successfully negotiate with a building official?
 
I guess my question is whether the code requirements for an STC rating for a floor-ceiling assembly are radically different from the requirements for an STC rating of a ceiling assembly?

BTW There is no requirement for a fire-resistant rated floor-ceiling assembly in this building.
 
You can also look at the Catalog of STC and IIC Ratings for Wall and Floor-Ceiling Assemblies, as published by the Office of Noise Control, California Department of Health Services http://www.toolbase.org/PDF/CaseStudies/stc_icc_ratings.pdf

Or contact the truss Manufacurer for some of their tested Assemblies

And no there is not a radical difference between FC Assemblies and RC Assemblies, But there is a difference.
 
GA-600 also has some floor/ceiling assemblies with STC ratings. However, all of them have some sort of ceiling membrane (tyipically gypsum board) attached to the underside of the joists. I seriously doubt you will be able to achieve an STC 40 with only 3/4" T&G subflooring.
 
RLGA said:
I seriously doubt you will be able to achieve an STC 40 with only 3/4" T&G subflooring.
Click to expand...
You will NOT be able to achieve an STC 40 with only 3/4" T&G subflooring
 
Why am I not surprised to learn that the great state of California has an Office of Noise Control?

I wonder, do we have an Office of Nose Control?
 
ICE said:
Why am I not surprised to learn that the great state of California has an Office of Noise Control? I wonder, do we have an Office of Nose Control?
Click to expand...
I heard the DEA took over their responsibilities.
 
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