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We have an I-1 structure of V-B construction being constructed with an NFPA 13 system. The roof structure is a 6/12 gable roof, constructed of light gauge steel trusses and 5/8 CDF plywood sheathing (shingled roof). Because of the width of the building, the 6/12 pitch yields a rather large "attic" space above the ceiling. The sprinkler drawings that have been submitted do not provide attic coverage, citing the section (NFPA 13 8.15.1.2.1), which exempts concealed spaces of non-combustible construction.
The question is: Does the commodity fir plywood roof sheathing make this a combustible concealed space?
The question is: Does the commodity fir plywood roof sheathing make this a combustible concealed space?