S-1?

[Sdpaddler50]

The details:
-Large warehouse.
-Rack storage class,III-IV, but also large amount of Group A, unexpanded plastics, cartoned mixed throughout – typical of most warehouses these days.
-Because of plastics, overall commodity is “high hazard” (most restrictive governs).
-Sprinkler system designed per NFPA 13 to protect high hazard (ESFR) – so adequate protection throughout entire warehouse for all commodities being stored, including the plastics.
-S-1 definition is “moderate combustible loading”, so Group A plastics are technically outside this classification.
Question:
Common terminology in my area is to call a warehouse like this S-1, but what code reference am I falling back on, if I have high hazard plastic storage? IE, what code justification do i have to call this overall S-1?
Thanks in advance for any comments.

 

[stookeyfpe]

S-1 is the correct occupancy classification. The IBC classification for Group S occupancies is not correlated to the IFC or NFPA 13 classification for commodities. The basis for the occupancy classification is IBC Section 311.2.