Concerning NFPA 13, 188.8.131.52.7. Have wood truss floor & ceiling assembly 16" in a R2 building. The building WILL be sprinklered. Does the concealed space within the trusses need to be sprinklered? Would it be able to filled with noncombustible insulation with a 2" air gap at the top of the space? Thank you, Lawrence L. Lukenda, Fire Subcode Official, City of Linden, NJ.