1 hour Fire Rated Roof-Ceiling Assembly

I am working on a commercial tenant improvement that is being converted to Type 3A construction and an A3 Occupancy. The existing panelized roof system needs to be upgraded to a 1 hour rated assembly. Do I need to wrap the existing 4x16 DF#1

(8' o.c.) purlins with gyp board?

 

I am confused with the requirements of table 602.4, which classifies a 4x6 as heavy timber, and section 721.6.3.4 which limits wood members to a minimum nominal size of 6 inches or greater. 

 

 

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