let's say we have a bank. it has a teller line, offices, and meeting rooms.
when working out the occupant load, all the general areas and offices we're using a factor load of 100 (gross).
for the board room (conference room) we are using a factor load of 15 (net). and for the teller queuing area, we are using a factor load of 5 (net).
since this is not california, we are using just the 2009 IBC and IPC. on the conservative side, we started out counting all the accessory spaces (stairs, restrooms, corridors, etc.), since we have a 'gross' load factor. but now it's requiring additional fixtures (existing facility, built it the late 60's).
so i had a thought. if the net load occupants are greater than the gross load occupants (not including accessory spaces), can we then not include the accessory space occupants? keep in mind, we are only doing this for plumbing fixture counts. for egress, i'm going the conservative route.
functionally, this bank has been in operation for along time. they don't need any more toilets than they already have. but per the new codes, if we apply a conservative view of occupant loading to the plumbing fixture counts, we have to add more.
also, because of the code requirement that fractional numbers will ALWAYS be rounded up (for plumbing fixture counts), it seems that with the gross occupant loading numbers (where you have to count restrooms), there's a double wammy going on here.
in this case, including all the gross areas, we need 2.16 toilets for men and the same for women. they have two for each right now and are happy with that. that's why i'm trying to justify a net area application to the accessory spaces to get below the +2 number.
so, let me know what you think? let me know if i'm all flush up?