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The primary factors in the calculation are: the type of occupancy, along with the available floor space and the available means of egress.

When creating or modifying a building, the building use and occupancy load determine the fire resistance requirements. Or the desired type and occupancy load may help determine the necessary area and means of egress.

Buildings are classified by the ICC (International Code Council) by group and division.

Groups - defined

Group A - Assembly

Group B - Business

Group E - Educational

Group F - Factory and Industrial

Group H - Hazardous

Group I - Industrial

Group M - Mercantile

Group R - Residential

Group S - Storage

Group u - Utility

Each group mostly has more than one division, categorized by number; I.E.

Group A Division 1 , which is the most stringent category for fire resistant materials and means of egress code rules, is more stringent than Group A

Division 4.

Like wise , Group U Division 2, which is the lowest requirements is less stringent

than Group U Division 1 requirements.

In summary, the lower the letter and number, the more stringent are the fire

resistive , and means of egress components.

To know the fire resistive construction and means of egress requirements of your building, consult the building code book for your state ; which may supersede

the I.C.C.

To be absolutely sure ,consult with your local building department with information about what kind of use the building is intended for , how big of an occupancy intended , and whether or not it is connected or near to another business of same or different classification.

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Q: How do you calculate a Fire occupancy Load?
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