MK23 asks: How do they figure out the maximum occupancy for a building? International Building Code Country Club Hills, Ill. Quincy, Mass. Enjoy this article? Answers Articles Featured Facts Misc. Maia August 28, pm. Dave S March 19, pm. Robert July 5, am.
George April 16, pm. Joyce L Treat December 15, am. Tina September 1, pm. Does the number of staff figure into the occupancy figure or is it just for the seating area? Richard Gregory Brodie January 21, am. Michael Rudmin February 7, am. Spencer June 29, am. Darci July 31, pm.
How many square feet per person for offices with cubicles and only 1 exit? Bowling Centers, allow 5 persons for each lane including 15 feet or runway, and for additional areas. Areas on the floors Basement and grade floor areas Storage, stock, shipping area.
Assembly without fixed seats Concentrated chairs only — not fixed Standing Space Unconcentrated tables and chairs. Educational Classroom area Shops and other vocational room areas. Institutional areas Inpatient treatment areas Outpatient areas Sleeping areas. Mercantile Areas on the floors Basement and grade floor areas Storage, stock, shipping area.
Skating rinks, swimming pools Rink and pool Decks. Note that it is NOT based on the occupancy group classification. When this table is used, it results in an occupant load for which a room, space and building is designed to.
Once the occupant load is established, the means of egress is then designed for at least this number. Below is Table The entire Table can be found Here. What happens if a function is not listed in this Table? The code gives the Building Official the authority to establish a function for the space that most nearly resembles a function within the table. Now before we run into an example of how to calculate the occupant load based off this table, I want to point out two important factors.
Let us see what the code defines these as. This is fairly simple to understand. The net floor area is intended to include only the area of the room used for a specific purpose and does not include the areas mentioned in the above definition and therefore is not included in the net floor area. The floor area of a building, or portion thereof, not provided with surrounding exterior walls shall be the usable area under the horizontal projection of the roof or floor above.
The gross floor area shall not include shafts with no openings or interior courts. This can be somewhat harder to understand but for simplicity the gross floor area would include the area of all occupiable and nonoccupiable spaces. Therefore based on the definition, only exterior walls, vent shafts and courts can be deducted from the building area, but other accessory areas such as corridors, stairways, etc… as mentioned in the definition above are not deducted.
It is important to mention that the code does have an exception where the Building Official has the authority to permit a design occupant load that is less than the actual number calculated by the table for an occupied space. Although this exception is there it is best to understand its intent. It is understandable that some occupancies may not typically reflect an occupant load that is consistent with the occupant load factors within the Table.
However it is not the intent of this exception to reduce code requirements, instead it is an alternative to address limited unique circumstances where the actual occupant load might be less than the calculated load. If such a change is made, it should be documented and justified, as well as understood that such consideration can impact the use of the building related to egress and other features addressed in the code.
The occupant load factor changes based on the relevant classification of the area. A copy of Table Table Divide the square footage of the area by the relevant occupant load. This is the maximum occupancy. Once the maximum occupancy is determined, multiply that number by the relevant occupancy percentage used in the reopening guidance. For the above example, the number of people allowed at any given time would be TABLE Exhibit gallery and museum 11 gross 30 net Assembly with fixed seats See Section Send Print Report.
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