When applying NFPA 13R to a mixed-occupancy (R-2 and S-2) building, what is the definition of "incidental"?
The building in question is three stories of residential over a parking garage designated for residents only. Each residential floor is approximately 2,000 sqft and the garage is approximately 3,000 sqft. The building is type V-A (wood, combustible) throughout.
IBC 2015 Section 509 defines incidental as constituting less than 10% of a given floor.
Does this entire building require a full NFPA 13 system?
If possible, please provide a code basis, thank you!
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