For the purpose of determining construction type (not egress capacity), is the total building occupant load calculated using:
a. total building area /occupant load factor specific to building use?
b. room by room tally of occupant load factors specific to each room's use (i.e. business, storage, etc)
AND, regarding multiple or mixed occupancy:
c. Is there a threshold allowing a certain portion of incidental/accessory occupancy within the primary occupancy classification? In other words, if some spaces are incidental to the primary use (i.e. small storage/office spaces supporting an assembly use) MUST the building be considered multiple or mixed occupancy?
Please clarify, including sections of code where it is spelled out. Or, can the AHJ require any method they choose to calculate the occupant load of the building? It seems like the code should describe the correct method to use....???