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ICC/STC Rating for Floor/Ceiling Assemblies

Also check with the GA-600-2015 or newer Fire Resistance Design Manual, put out by our friends at the Gypsum Association.
 
Look at GA-600 for gypsum board assemblies. The California Department of Health published a catalog of STC and IIC ratings. It is old (no longer published) but, in my opinion, I think they are still valid to the most extent.
 
The problem with the GA-600 or any other catalog is that I'm limited to their assemblies which often call for proprietary products and which aren't always the best options for the buildings I'm designing. Is there an approved method for adding up STC values for each element of the assembly?
 
The restriction on proprietary assemblies only applies to fire-resistance-rated assemblies per Tables 721.1(1)-(3).
 
Mitch said:
The problem with the GA-600 or any other catalog is that I'm limited to their assemblies which often call for proprietary products and which aren't always the best options for the buildings I'm designing. Is there an approved method for adding up STC values for each element of the assembly?
Click to expand...
Pretty much all assemblies are proprietary--even the generic assemblies listed in GA-600. If you look at the UL assembly associated with a "generic" GA-600 assembly, you will find that it typically lists some proprietary products.

If sound transmission is a serious concern due to potential liability risk, then I suggest hiring an acoustician as a consultant to reduce your risk exposure.
 
Mitch said:
The problem with the GA-600 or any other catalog is that I'm limited to their assemblies which often call for proprietary products and which aren't always the best options for the buildings I'm designing. Is there an approved method for adding up STC values for each element of the assembly?
Click to expand...
GA-600 is a great place to start as others have mentioned.

Also, every gyp mfg has assemblies with sound tests. Gypcrete/soundmat mfgs have tested assemblies.

Note that you don't need to follow any listed assembly to get permitted for STC/IIC requirements (there aren't really "listed" assemblies for sound). Sound ratings are not the same as fire ratings where you need to follow the exact products from the UL assy submitted to plan review to meet code. The assy only needs to pass the in situ test. There are very few AHJs which require an in situ test.
 
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