Answer:
The question here is backwards. No offence intended. With that said , the building use and occupancy load determine the fire resistance requirements.
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.