We have a project with a Class IV commodity rack storage area. The building has a roof slope around 24% (5.5 / 12).
Based on NFPA 13 2022 Edition, Section 20.9.1, one option for this case is "where storage is protected with in-rack sprinklers in accordance with one of the options in Section 25.6, provided no storage is placed above the highest level of in-rack sprinklers."
The question is: if a horizontal barrier and a level of rack sprinklers are installed above the last load level, and there is not going to be any storage above this level, can a system design be done based on 25.6 omitting the ceiling sprinklers?
The gap between the top of the load and the roof is about 6.5 meters in the highest area.
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