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Appendix B — FIRE-FLOW REQUIREMENTS FOR BUILDINGS

B104 Fire-Flow Calculation Area — 2025 California Fire Code

California Fire Code (Title 24, Part 9) · 2025 edition · updated 2026-09-25 · California

CBSC: official editions, supplements and errata

Italicized text is a California amendment to the model code, as printed in the official publication.

Cite as: 2025 California Fire Code (Title 24, Part 9) § B104 · Effective January 1, 2026 · Official source: Building Standards Commission

B104.1 General.

The fire-flow calculation area shall be the total floor area of all floor levels within the exterior walls, and under the horizontal projections of the roof of a building.

Exceptions:

  1. The fire-flow calculation area of buildings constructed of Types IA and IB construction shall be the area of the three largest successive floors.

  2. The fire-flow calculation area for open parking garages of Types IA and IB construction shall be determined by the area of the largest floor.

Exceptions & meaning →

B104.2 Area separation.

Portions of buildings that are separated by fire walls without openings, constructed in accordance with the California Building Code, are allowed to be considered as separate fire-flow calculation areas.

Exceptions & meaning →

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▸Contents — California Fire Code (Title 24, Part 9)
California Fire Code (Title 24, Part 9)

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