Gross Floor Area is defined as the floor area within the inside perimeter of the outside walls of the building under consideration with no deduction for hallways, stairs, closets, thickness of interior walls, columns, or other features.

Gross Floor Area is defined as the floor area within the inside perimeter of the outside walls of the building under consideration with no deduction for hallways, stairs, closets, thickness of interior walls, columns, or other features.

• A. The floor area within the inside perimeter of the outside walls with deductions for hallways and stairs.
• B. The floor area within the inside perimeter of the outside walls with no deduction for hallways, stairs, closets, thickness of interior walls, columns, or other features.
• C. The gross floor area of the entire site.
• D. The area of exterior walls only.

Answer: (B)

Gross Floor Area is the total floor area contained within the inside perimeter of the building’s exterior walls, and it includes all interior spaces without subtracting features like hallways, stairs, closets, interior wall thickness, columns, or other elements. This definition is used in NFPA 101 to establish the area basis for calculations such as occupant load and egress requirements, as well as to determine allowable floor area limits for different occupancies. The option describing deductions for hallways and stairs would be net floor area, not gross. The option referring to the entire site describes site area, not the building interior. The option for exterior walls only would measure something like wall surface area or thickness, not the floor area inside the building.

Gross Floor Area is the total floor area contained within the inside perimeter of the building’s exterior walls, and it includes all interior spaces without subtracting features like hallways, stairs, closets, interior wall thickness, columns, or other elements. This definition is used in NFPA 101 to establish the area basis for calculations such as occupant load and egress requirements, as well as to determine allowable floor area limits for different occupancies. The option describing deductions for hallways and stairs would be net floor area, not gross. The option referring to the entire site describes site area, not the building interior. The option for exterior walls only would measure something like wall surface area or thickness, not the floor area inside the building.