Floor Area Calculation For Occupancy

The occupancy load is calculated by dividing the area of a room by its prescribed unit of area per person.

Floor area calculation for occupancy.

Measure only the area where people will sit or stand. Floor or building as the case may be is designed or 2 by using the appropriate occupant area ratios from table 6 2 whichever is larger. The floor area within the inside perimeter of the exterior walls of the building under consideration exclusive. If you have a room that is shaped irregularly separate the room into square portions for ease of measurement.

For instance the chart dictates that dormitories require 50 square feet of floor area for every room occupant. Calculate the occupancy load using the following formula. Determine the number of exits needed by determining the number of occupants in the office. Where data regarding the sq.

Occupancy rate is maximum numbers of persons per area unit. The occupant load of any space shall include the occupant load of all spaces that discharge through it in order to gain access to an exit. When calculating occupancy we do not use one calculation for the entire building we need to apply the occupancy rules for each of the various areas to attain accurate calculations. Units of area per person for specific buildings can be found in the chart at the end of this article.

The code formulates the number of exits based on the number of occupants in the office. The general guidelines for floor area allowances per occupant for a 2 occupancy is as follows. The occupant load factors used for each room come from table 7 3 1 2 in nfpa 101 life safety code. Nonoccupiable spaces like corridors stairs bathrooms electrical mechanical rooms closets and fixed equipment are subtracted from the total area to determine the net floor area.

Spaces 450 ft in area 75 ft fact sheet the floor plan below shows an example of occupant load calculations for several types of rooms commonly found in an office. Floor area occupant load factor occupancy load for office. 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. When an occupant load factor is based on the net floor area the calculation is based on the actual occupied area.

If the minimum area per person is 100 sq ft the occupation rate is 1 100 0 01 person per sq ft or 10 persons per 1000 sq ft. To calculate the net floor area of the classroom. To calculate a room s maximum occupancy determine factors such as the area of the room the available space in the room the number of useful exits and the height of the ceiling.