IT has been awhile since I looked at this but I think you are reading that 
section out of context. I think there are 2 trade-offs including the reduction 
of the passive rating that is restricted to the presence of a full 13 system 
throughout BUT the IBC considers a building protected throughout even when a 
13R system is installed.

Awaiting input from our code boys and gals.

Roland Huggins, PE - VP Engineering
American Fire Sprinkler Assn.       ---      Fire Sprinklers Saves Lives
Dallas, TX
http://www.firesprinkler.org





On Jul 28, 2014, at 12:37 PM, Steele, Andrew <[email protected]> 
wrote:

> There are some other building code (and possibly even insurance risk 
> assessment) issues that are likely to arise when using a NFPA #13R system; a 
> 13R system IS NOT a fully protected building.  For example, ICC Table 508 
> "required separation of occupancies" does not recognize 13R systems, so if 
> the building has or gets multiple uses, it's a "non-sprinkled" building, 
> typically doubling the required separation .
> 
> A. Steele

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