In NFPA 13R, sprinklers may be omitted from bathrooms and closets provided they meet the area and size requirements, and are constructed with limited or non-combustible materials (gypsum/drywall).
Should sprinklers be installed in bathrooms and closets on the top floor regardless of area/size and construction to prevent a fire on the top floor from getting into the ceiling space and spreading?
I have seen other designers do this but I can't find any formal requirements for this approach.
Has anyone else ever done this? Would it matter if the ceiling and roof assembly were fire rated?
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