The building regulations Approved Document B2, ' Fire safety: Buildings other than dwellinghouses ', defines the occupant capacity of a room, storey, building or part of a building as: The maximum number of persons it is designed to hold; or. Thus, a 900 square foot classroom has a design occupant load of 45 (900 ft² / 20 ft² per occupant). : An occupant load factor of 5 (net) will be applied to the following areas: • Line or queuing spaces in front of ticket booths, concession stands, and food service Occupant Load Factor: The occupant load factor is a designation of square feet per person based upon the use of a given space. (NFPA 101-2018 Occupant Load Factor table 7.3.1.2 - Shops, laboratories, vocational rooms, pg. Figure 2: Accidents Increase as Space/Student Decreases (Elbow Space) (p<0.001) . Maximum Floor Area Allowance Per Occupant. classroom is decreased when there are additional instructional support personnel present. OCCUPANT LOAD FACTOR a. Accessory storage areas, mechanical equipment room. However, this "occupant load" does not represent the maximum allowable number of occupants that can ever occupy the room. If this classroom example is in a building constructed in 1980, it falls under the jurisdiction of Title 23 IL Admin Code Parts 175 and 185. To calculate the occupant load for an area without fixed seating, the code says to compute the area of the room or space at a rate of one occupant per unit of area using the occupant load factor found in Table 1004.1.2. The occupant load factor for business uses has been revised to one occupant per 150 square feet. Occupant load factor is not applicable. Occupancy load is the maximum number of occupants (students, teachers, paras, volunteers, etc.) The Table does not list a category for large . Agricultural building. For areas without fixed seating, the occupant load shall be not less than that number determined by dividing the floor area under consideration by the occupant load factor assigned to the function of the space as set forth in Table 1004.5. Once the occupant load factor has been determined based on the use of the space, it is then used to calculate the occupant load of that space. (3) its largest non-compartmented AFA exceeds 750m². Gross floor area is measured within the inside surface of the walls, and includes all occupiable and nonoccupiable spaces. You can look up when the building was built and then go to the relevant building code and pull out the Occupant Load table. IR A-26.CC: Occupancy Classification and Load Factors. For example, a 1,250-sq. 300 gross. 20 net . . A building or tenant space used for assembly purposes with an occupant load of less than 50 persons shall be classified as a Group B occupancy. It is used to determine occupant load by dividing the occupant load factor from the overall square footage of an area. Table 1004.5, Maximum Floor Area Allowances Per Occupant . The occupant load factor in this example is from the current building code (2015 IBC) and applies to new construction, additions, and occasionally existing buildings (depending on the level of modification). Live loads on decks and balconies increase the deck live load to one and one-half times the live load of the area served. 9. : An occupant load factor of 5 (net) will be applied to the following areas: • Line or queuing spaces in front of ticket booths, concession stands, and food service The number of occupants shall be computed at the rate of one occupant per unit of area as prescribed in Table 1004.5. Accordingly, what is an occupant load factor? Aircraft hangars. and . Occupant load factor is not applicable. IR A-26: K-12 Occupancy Classifications and Occupant Load Factors for Community Colleges. For classrooms, both the IBC and NFPA 101 list an occupant load factor of 20 net square feet per person. Certain types of occupancies and businesses will be more impacted than others. Example of occupant load determination occupant load of no less than 20 sqft per person versus the occupant load of no less than 50 sqft per person shall be imposed by CSU. For example, here in California, the max occupant load for a classroom in the current version of building code is 20 net sf/occupant per Table 1004.1.2. The following rooms and spaces shall not be classified as Assembly occupancies: 1. occupancy with an occupant load factor of 200 (gross). Educational Classroom area Shops and other vocational room areas: 20 net 50 net: Exercise rooms: 50 gross: Group H-5 . The occupant load factors used for each room come from Table 7.3.1.2 in NFPA 101. When you start to get into weird programs this comes up a lot more. CALL CENTER 50 ft x 25 ft = 1,250 ft 2 1,250 ft2/50 ft2 per person = 25 people CONFERENCE ROOM Subtract cabinets: (75 ft - 5 ft) x (50 ft - 5 ft) = 70 ft x 45 ft 70 ft x 45 ft = 3,150 ft2 The occupant load factors used for each room come from Table 7.3.1.2 in NFPA 101. Instead, the calculated occupant load is actually the . In adult education facilities, however, the IBC changes the occupancy classification from B (classroom) to A-3 (lecture hall) if the occupant load of the classroom exceeds 49. While the terminology is similar, they are not interchangeable concepts. To calculate the occupant load of a room or space, you take the area and divide by an occupant load factor. Hope this helps. The occupant load factor is based on function. For classrooms, IBC Table 1004.1.2 provides an occupant load factor of 20 square feet per person for exiting purposes. MISC. square foot classroom. The area of this room is 1,120 square feet (40′ x 28′), and the occupant load is 56 people (1,120 square feet / 20 square . Classroom area. the occupant load permitted in any building, or portion thereof, is permitted to be increased from that number established for the occupancies in table 1004.5, provided that all other requirements of the code are met based on such modified number and the occupant load does not exceed one occupant per 7 square feet (0.65 m 2) of occupiable floor … 9. To calculate the occupant load of a room or space, you take the area and divide by an occupant load factor. Every room or space which is used for assembly, classroom, dining or similar purposes having an occupant load of 50 or more shall have the occupant load of the room or space posted in a conspicuous place, near the main exit or exit access doorway. The occupant load in any building or portion thereof shall be not less than the number of persons determined by dividing the floor area assigned to that use by the occupant load factor for that use as specified in Table 7.3.1.2, Figure 7.3.1.2(a), and Figure 7.3.1.2(b). Hospital They shall comply with the following additional requirements: (1) Basement Patient accommodation area containing beds shall not be located in basement storeys. If this classroom example is in a building constructed in 1980, it falls under the jurisdiction of Title 23 IL Admin Code Parts 175 and 185. occupancy with an occupant load factor of 200 (gross). 500 gross. Calculating occupant load can be thought of in three steps: Select an occupant load factor Determine the size of the room Apply the occupant load factor to the space The IBC lists these factors in a table, and the factor for educational classrooms is 20 square feet per person. For classrooms, IBC Table 1004.1.2 provides an occupant load factor of 20 square feet per person for exiting purposes. 8.2 Carports: May be classified as a Group "U" occupancy. 303.1.2Small assembly spaces. The minimum lateral load that fire walls are required to resist is five pounds per square foot. To calculate the occupant load, the first step is to calculate the area of the space in question by multiplying the length times the width - typically measured within the interior faces of the walls. The occupant load factor for a standard classroom is 20 square feet per occupant. While the majority of studies reviewed here characterize the heating, ventilating and/or air‐conditioning (HVAC) system using measurements of ventilation rates or CO 2, other building factors that may be of importance include recirculation rates, temperature and humidity, occupant density, proximity and movement patterns, presence of control . For example, here in California, the max occupant load for a classroom in the current version of building code is 20 net sf/occupant per Table 1004.1.2. For egress purposes, a classroom use is classroom use - it doesn't matter if it is in an elementary school, high school, college classroom, or adult education. Wind speed maps updated . 101-81). Faculty or Grad Student offices would be calculated based on the office function of 100 sf/p. Both fire and building legal standards like occupancy Both ISBE and OSFM codes establish an "occupant load factor" w hich is a designation of the number of square feet per person that must be used to calculate the "occupant load" of a room. For example, if a classroom measures 30 feet by 40 feet, the nominal area is 1,200 square feet (30' x 40' = 1200 SF). FUNCTION OF SPACE. There is a common misconception that the calculated occupant load is the maximum number of occupants the space can contain. Live loads on decks and balconies increase the deck live load to one and one-half times the live load of the area served. Which is to say, it can be E and still have an occupant load and requirements of an assembly use. Therefore, you can have a Group B, higher education/college building that has classrooms that have occupant loads calculated at 20 sf/p. On the other hand, the same laboratory with 30 . Thus, a 900 square foot classroom has a design occupant load of 45 (900 ft² / 20 ft² per occupant). . Hope this helps. Occupancy grouping and use (occupant load) are separate sections of the code and actually separable designations. Applying occupant load factors to buildings To determine the occupant load of a space, divide the size of the space by the occupant load factor(s) of Table 1004.5 of the 2020 MSFC (see common ones above). Educational Classroom area Shops and other vocational room areas: 20 net 50 net: Exercise rooms: 50 gross: Group H-5 . Determine the size of the room. 402.8.2 Special Detailed Requirements Based on Occupancy and Use, Determination of Occupant Load ) and the occupant load factor as determined by Equation 4-1. Consider the occupancy type and use to understand the impact of social distancing on operations. Per Table 7.3.1.2 of NFPA 101 the occupant load factors are based on uses and not occupancy group classifications. 300 gross. Live loads on decks and balconies increase the deck live load to one and one-half times the live load of the area served. MISC. Both ISBE and OSFM codes establish an "occupant load factor" w hich is a designation of the number of square feet per person that must be used to calculate the "occupant load" of a room. To determine the occupant load based on reduced capacity due to COVID-19 restrictions, multiply the design occupant load 3 Definitions: Traditional Educational . Apply the occupant load factor to the space. In adult education facilities, however, the IBC changes the occupancy classification from B (classroom) to A-3 (lecture hall) if the occupant load of the classroom exceeds 49. In many assembly settings, there will be more than one use. The occupant load factor for business uses has been revised to one occupant per 150 square feet. . OLF = (0.00007) ( GLA ) + 25 (Equation 4-1) where: OLF . Note that it is NOT based on the occupancy group classification. Occupant load means the number of persons for whichthe means of egress in a building or part Section 1004 — Occupant load. The occupant load factor is the maximum floor area allowed per occupant as displayed in Table 1004.1.2. . ft. net/occupant. Occupancy classifications and means of egress occupant load factors are two different things. The number calculated by dividing the area of room or storey (s) (m²) by a floor space factor (m² . Calculating occupant load can be thought of in three steps: Select an occupant load factor. . Contact. The occupant load factor for business uses has been revised to one occupant per 150 square feet. The occupant load factor for a standard classroom is 20 square feet per occupant. To determine the occupant load based on reduced capacity due to COVID-19 restrictions, multiply the design occupant load Table 1004.1.2 displays the occupant load factor based on the function or use of a space or room. Conference room occupancy is . The IBC lists these factors in a table, and the factor for educational classrooms is 20 square feet per person. However, this "occupant load" does not represent the maximum allowable number of occupants that can ever occupy the room. The occupant load factor in this example is from the current building code (2015 IBC) and applies to new construction, additions, and occasionally existing buildings (depending on the level of modification). allowed in the lab site. (Please note that Table 1004.1.2 referenced in this post is from the 2015 International Building Code (IBC). Please see the following example. Classroom occupancy is calculated at 20 square feet per person. For example, if a classroom measures 30 feet by 40 feet, the nominal area is 1,200 square feet (30' x 40' = 1200 SF). Every room or space which is used for assembly, classroom, dining or similar purposes having an occupant load of 50 or more shall have the occupant load of the room or space posted in a . (3) Number of exits per ward Where both gross and net area figures are given for the same occupancy, calculations shall be made by applying the gross area . CALL CENTER 50 ft x 25 ft = 1,250 ft 2 1,250 ft2/50 ft2 per person = 25 people CONFERENCE ROOM Subtract cabinets: (75 ft - 5 ft) x (50 ft - 5 ft) = 70 ft x 45 ft 70 ft x 45 ft = 3,150 ft2 b. Posting for the first time. Occupant Load Factor: The occupant load factor is a designation of square feet per person based upon the use of a given space.