Again I’ve come across something I’ve never dealt with so I am going to need your help please. Recently there has been discussion concerning the fact that NFPA13R occupancies cannot be over mercantile occupancies that are not incidental to the residential occupancy. What I have is a three story building with mercantile on the ground level. The other two floors above are apartments. The entire building is designed by NFPA13 standards. The apartments are designed using the “Dwelling” section of NFPA13. So far I’m okay I think, but now I find that the floor system for second and third floor is comprised of “TJI” composite wood joist with the ceilings directly attached thus creating combustible concealed spaces and requiring the dreaded minimum 3000 sq. ft. design area. The question is does this now make the use of NFPA13 “Dwelling” null and void? It would appear to me that it would, but I need other opinions/rulings.
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