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Rated walls

Hang on.... depends on why the rated wall exists. If a fire wall is used to create separate buildings or a fire barrier is used to reduce fire area, then rating is higher.

Fire wall would be 3hrs per Table 706.4

Fire barrier would also be 3hrs per Table 707.3.10
 
I would double check the type of construction given that type 1 construction requires either a 1 or 1 1/2 hour rated roof assembly for the F-1 occupancy.
 
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