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Fire Resistance Rating - Pan Joist Floor

Fire Resistance Rating - Pan Joist Floor

Fire Resistance Rating - Pan Joist Floor

(OP)
I am looking at fire resistance requirements for pan joist floor, using IBC 2000, Type 1A construction.  Per Table 601, for Type 1A, structural frame (columns and beams/girders framing into the columns) requires 3 hour, floor construction requires 2 hour.  I am assuming that pan joist top slab thickness therefore can be based on 2 hour, which results in 4.6" minimum thickness per Table 719.1(3). The thing that bugs me is that Table 719.1(3) shows required slab thicknesses for fire resistance ratings up to 4 hours.  However, Table 601 does not require 4 hour for ANYTHING.  This makes me wonder if I am missing something.  Do you agree with the 2 hour/4.6" top slab thickness for Type 1A construction?    

RE: Fire Resistance Rating - Pan Joist Floor

You might also be able to get your rating with a thinner top slab and block fillers in the void between the ribs. No metal pans required for this type of construction, just a flat deck.

RE: Fire Resistance Rating - Pan Joist Floor

Similar situation - went with 4 3/4" slab thickness.  No questions from local codes or fire marshalls.

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