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Assignment 1: Commodity At The Roof

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You have asked the following question: “Commodity is cartoned, expanded Group A plastics stored on multiple row racks to 32ft. there are (4) rack levels at about 8 ft. The building height is 40 ft. There are existing K17 ESFR pendants at the roof (originally designed for 52 psi). If the alternative protection method is utilized per 17.1.2.9 and horizontal barriers are installed on the bottom two tiers on the multiple row rack and in-rack sprinklers are designed and installed per 17.1.2.9., can the remaining commodity on the top two tiers of rack (open shelves) above the top level of horizontal barrier be protected by the existing ESFR's at roof level? The top two levels of rack storage is under 16 ft. and the roof is 23 ft. above the horizontal barrier (treating the upper level of in-rack above topmost horizontal barrier to be treated as "floor").

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