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IBC Concrete Cover for Fire

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Under the IBC there is the prescriptive concrete cover requirements for fire rating, and then there is the calculated fire rating requirements immediately following.  In the calculated section there are additional tables of minimum concrete coverage that appear prescriptive (not providing a value for any form of calculation, just this is the minimum coverage).
 
The two tables do not agree with each other.
 
When is the calculated section supposed to apply instead of the standard prescriptive values?
 
Paul Feather PE, SE
pfeather(--nospam--at)SE-Solutions.net
www.SE-Solutions.net