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Appendix B — FIRE-FLOW REQUIREMENTS FOR BUILDINGS

Section B105 — FIRE-FLOW REQUIREMENTS FOR BUILDINGS

2025 California Fire Code (Title 24, Part 9) · 2025 edition · updated 2026-07-27 · California

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

B105.1 One- and two-family dwellings, Group R-3 and R-4 buildings and townhouses.

The minimum fire-flow and flow duration requirements for one- and two-family dwellings, Group R-3 and R-4 buildings and townhouses shall be as specified in Tables B105.1(1) and B105.1(2).

on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

APPENDIX B—FIRE-FLOW REQUIREMENTS FOR BUILDINGS

TABLE B105.1(1)—REQUIRED FIRE FLOW FOR ONE- AND
TWO-FAMILY DWELLINGS, GROUP R-3 AND R-4 BUILDINGS AND TOWNHOUSES

FIRE-FLOW
CALCULATION AREA
(square feet)		 AUTOMATIC
SPRINKLER SYSTEM
(Design Standard)		 MINIMUM
FIRE FLOW
(gallons per minute)		 FLOW
DURATION
(hours)
0–3,600 No automatic sprinkler system 1,000 1
3,601 and greater No automatic sprinkler system Value in Table B105.1(2) Duration in Table B105.1(2) at
the required fire-flow rate
0–3,600 Section 903.3.1.3 of the_California Fire Code_ or
Section P2904 of the_California Residential Code_		 500 1/2
3,601 and greater Section 903.3.1.3 of the_California Fire Code_ or
Section P2904 of the_California Residential Code_		 1/2 value in Table B105.1(2) 1
For SI: 1 square foot = 0.0929 m2, 1 gallon per minute = 3.785 L/m.

TABLE B105.1(2)—REFERENCE TABLE FOR TABLES B105.1(1) AND B105.2

FIRE-FLOW CALCULATION AREA (square feet) FIRE-FLOW CALCULATION AREA (square feet) FIRE-FLOW CALCULATION AREA (square feet) FIRE-FLOW CALCULATION AREA (square feet) FIRE-FLOW CALCULATION AREA (square feet) FIRE FLOW
(gallons per
minute)b		 FLOW
DURATION
(hours)
Types IA and IBa Types IIA and IIIAa Types IV and V-Aa Types IIB and IIIBa Type V-Ba Type V-Ba Type V-Ba
0–22,700 0–12,700 0–8,200 0–5,900 0–3,600 1,500 2
22,701–30,200 12,701–17,000 8,201–10,900 5,901–7,900 3,601–4,800 1,750 1,750
30,201–38,700 17,001–21,800 10,901–12,900 7,901–9,800 4,801–6,200 2,000 2,000
38,701–48,300 21,801–24,200 12,901–17,400 9,801–12,600 6,201–7,700 2,250 2,250
48,301–59,000 24,201–33,200 17,401–21,300 12,601–15,400 7,701–9,400 2,500 2,500
59,001–70,900 33,201–39,700 21,301–25,500 15,401–18,400 9,401–11,300 2,750 2,750
70,901–83,700 39,701–47,100 25,501–30,100 18,401–21,800 11,301–13,400 3,000 3
83,701–97,700 47,101–54,900 30,101–35,200 21,801–25,900 13,401–15,600 3,250 3,250
97,701–112,700 54,901–63,400 35,201–40,600 25,901–29,300 15,601–18,000 3,500 3,500
112,701–128,700 63,401–72,400 40,601–46,400 29,301–33,500 18,001–20,600 3,750 3,750
128,701–145,900 72,401–82,100 46,401–52,500 33,501–37,900 20,601–23,300 4,000 4
145,901–164,200 82,101–92,400 52,501–59,100 37,901–42,700 23,301–26,300 4,250 4,250
164,201–183,400 92,401–103,100 59,101–66,000 42,701–47,700 26,301–29,300 4,500 4,500
183,401–203,700 103,101–114,600 66,001–73,300 47,701–53,000 29,301–32,600 4,750 4,750
203,701–225,200 114,601–126,700 73,301–81,100 53,001–58,600 32,601–36,000 5,000 5,000
225,201–247,700 126,701–139,400 81,101–89,200 58,601–65,400 36,001–39,600 5,250 5,250
247,701–271,200 139,401–152,600 89,201–97,700 65,401–70,600 39,601–43,400 5,500 5,500
271,201–295,900 152,601–166,500 97,701–106,500 70,601–77,000 43,401–47,400 5,750 5,750
295,901–Greater 166,501–Greater 106,501–115,800 77,001–83,700 47,401–51,500 6,000 6,000
— — 115,801–125,500 83,701–90,600 51,501–55,700 6,250 6,250
— — 125,501–135,500 90,601–97,900 55,701–60,200 6,500 6,500
— — 135,501–145,800 97,901–106,800 60,201–64,800 6,750 6,750
— — 145,801–156,700 106,801–113,200 64,801–69,600 7,000 7,000
— — 156,701–167,900 113,201–121,300 69,601–74,600 7,250 7,250
— — 167,901–179,400 121,301–129,600 74,601–79,800 7,500 7,500
— — 179,401–191,400 129,601–138,300 79,801–85,100 7,750 7,750
— — 191,401–Greater 138,301–Greater 85,101–Greater 8,000 8,000
For SI: 1 square foot = 0.0929 m2, 1 gallon per minute = 3.785 L/m, 1 pound per square inch = 6.895 kPa.
a. Types of construction are based on the_California Building Code_.
b. Measured at 20 psi residual pressure.

APPENDIX B-4 2025 CALIFORNIA FIRE CODE

on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

APPENDIX B—FIRE-FLOW REQUIREMENTS FOR BUILDINGS

B105.2 Buildings other than one- and two-family dwellings, Group R-3 and R-4 buildings and townhouses.

The minimum fireflow and flow duration for buildings other than one- and two-family dwellings, Group R-3 and R-4 buildings and townhouses shall be as specified in Tables B105.1(2) and B105.2.

Exception: [SFM] Group B, S-2 and U occupancies having a floor area not exceeding 1,000 square feet, primarily constructed of noncombustible exterior walls with wood or steel roof framing, having a Class A roof assembly, with uses limited to the following or similar uses:

1. California State Parks buildings of an accessory nature (restrooms). 2. Safety roadside rest areas, (SRRA), public restrooms. 3. Truck inspection facilities, (TIF), CHP office space and vehicle inspection bays. 4. Sand/salt storage buildings, storage of sand and salt.

TABLE B105.2—REQUIRED FIRE FLOW FOR BUILDINGS OTHER THAN
ONE- AND TWO-FAMILY DWELLINGS, GROUP R-3 AND R-4 BUILDINGS AND TOWNHOUSES

AUTOMATIC SPRINKLER SYSTEM
(Design Standard)		 MINIMUM FIRE FLOW
(gallons per minute)		 FLOW DURATION
(hours)
No automatic sprinkler system Value in Table B105.1(2) Duration in Table B105.1(2)
Section 903.3.1.1 of the_California Fire Code_ 25% of the value in Table B105.1(2)a Duration in Table B105.1(2) at the reduced flow rate
Section 903.3.1.2 of the_California Fire Code_ 25% of the value in Table B105.1(2)b Duration in Table B105.1(2) at the reduced flow rate
For SI: 1 gallon per minute = 3.785 L/m.
a. The reduced fire flow shall be not less than 1,000 gallons per minute.
b. The reduced fire flow shall be not less than 1,500 gallons per minute.

B105.3 Water supply for buildings equipped with an automatic sprinkler system.

For buildings equipped with an approved automatic sprinkler system, the water supply shall be capable of providing the greater of:

  1. The automatic sprinkler system demand, including hose stream allowance.
  2. The required fire flow.

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▸ Contents — 2025 California Fire Code (Title 24, Part 9)
2025 California Fire Code (Title 24, Part 9)
  1. Chapter 1 — ADMINISTRATION
  2. Chapter 2 — DEFINITIONS
  3. Chapter 3 — GENERAL REQUIREMENTS
  4. Chapter 4 — EMERGENCY PLANNING AND PREPAREDNESS
  5. Chapter 5 — FIRE SERVICE FEATURES
  6. Chapter 6 — BUILDING SERVICES AND SYSTEMS
  7. Chapter 7 — FIRE AND SMOKE PROTECTION FEATURES
  8. Chapter 8 — INTERIOR FINISH, DECORATIVE MATERIALS AND FURNISHI…
  9. Chapter 9 — FIRE PROTECTION AND LIFE SAFETY SYSTEMS
  10. Chapter 10 — MEANS OF EGRESS
  11. Chapter 11 — CONSTRUCTION REQUIREMENTS FOR EXISTING BUILDINGS
  12. Chapter 12 — ENERGY SYSTEMS
  13. Chapter 20 — AVIATION FACILITIES
  14. Chapter 21 — DRY CLEANING
  15. Chapter 22 — COMBUSTIBLE DUST-PRODUCING OPERATIONS
  16. Chapter 23 — MOTOR FUEL-DISPENSING FACILITIES AND REPAIR GARAGES
  17. Chapter 24 — FLAMMABLE FINISHES
  18. Chapter 25 — FRUIT AND CROP RIPENING
  19. Chapter 26 — FUMIGATION AND INSECTICIDAL FOGGING
  20. Chapter 27 — SEMICONDUCTOR FABRICATION FACILITIES
  21. Chapter 28 — LUMBER YARDS AND AGRO-INDUSTRIAL, SOLID BIOMASS A…
  22. Chapter 29 — MANUFACTURE OF ORGANIC COATINGS
  23. Chapter 30 — INDUSTRIAL OVENS
  24. Chapter 31 — TENTS, TEMPORARY SPECIAL EVENT STRUCTURES AND OTH…
  25. Chapter 32 — HIGH-PILED COMBUSTIBLE STORAGE
  26. Chapter 33 — FIRE SAFETY DURING CONSTRUCTION AND DEMOLITION
  27. Chapter 34 — TIRE REBUILDING AND TIRE STORAGE
  28. Chapter 35 — WELDING AND OTHER HOT WORK
  29. Chapter 36 — MARINAS
  30. Chapter 37 — COMBUSTIBLE FIBERS
  31. Chapter 38 — RESERVED
  32. Chapter 39 — PROCESSING AND EXTRACTION FACILITIES
  33. Chapter 40 — STORAGE OF DISTILLED SPIRITS AND WINES
  34. Chapter 41 — TEMPORARY HEATING AND COOKING OPERATIONS
  35. Chapter 48 — MOTION PICTURE AND TELEVISION PRODUCTION STUDIO S…
  36. Chapter 49 — REQUIREMENTS FOR WILDLAND-URBAN INTERFACE FIRE AR…
  37. Chapter 50 — HAZARDOUS MATERIALS—GENERAL PROVISIONS
  38. Chapter 51 — AEROSOLS
  39. Chapter 52 — RESERVED
  40. Chapter 53 — COMPRESSED GASES
  41. Chapter 54 — CORROSIVE MATERIALS
  42. Chapter 55 — CRYOGENIC FLUIDS
  43. Chapter 56 — EXPLOSIVES AND FIREWORKS
  44. Chapter 57 — FLAMMABLE AND COMBUSTIBLE LIQUIDS
  45. Chapter 58 — FLAMMABLE GASES AND FLAMMABLE CRYOGENIC FLUIDS
  46. Chapter 59 — FLAMMABLE SOLIDS
  47. Chapter 60 — HIGHLY TOXIC AND TOXIC MATERIALS
  48. Chapter 61 — LIQUEFIED PETROLEUM GASES
  49. Chapter 62 — ORGANIC PEROXIDES
  50. Chapter 63 — OXIDIZERS, OXIDIZING GASES AND OXIDIZING CRYOGENI…
  51. Chapter 64 — PYROPHORIC MATERIALS
  52. Chapter 65 — PYROXYLIN (CELLULOSE NITRATE) PLASTICS
  53. Chapter 66 — UNSTABLE (REACTIVE) MATERIALS
  54. Chapter 67 — WATER-REACTIVE SOLIDS AND LIQUIDS
  55. Chapter 80 — REFERENCED STANDARDS
  56. Appendix Chapter 4 — SPECIAL DETAILED REQUIREMENTS BASED ON US…
  57. Appendix A — BOARD OF APPEALS
  58. ▸ Appendix B — FIRE-FLOW REQUIREMENTS FOR BUILDINGS
    Overview
    1. Section B101 — GENERAL
    2. Section B102 — DEFINITIONS
    3. Section B103 — MODIFICATIONS
    4. Section B104 — FIRE-FLOW CALCULATION AREA
    5. Section B105 — FIRE-FLOW REQUIREMENTS FOR BUILDINGS
    6. Section B106 — REFERENCED STANDARDS
  59. Appendix BB — FIRE-FLOW REQUIREMENTS FOR BUILDINGS
  60. Appendix C — FIRE HYDRANT LOCATIONS AND DISTRIBUTION
  61. Appendix CC — FIRE HYDRANT LOCATIONS AND DISTRIBUTION
  62. Appendix D — FIRE APPARATUS ACCESS ROADS
  63. Appendix E — HAZARD CATEGORIES
  64. Appendix F — HAZARD RANKING
  65. Appendix G — CRYOGENIC FLUIDS—WEIGHT AND VOLUME EQUIVALENTS
  66. Appendix H — HAZARDOUS MATERIALS MANAGEMENT PLANS AND HAZARDOU…
  67. Appendix I — FIRE PROTECTION SYSTEMS—NONCOMPLIANT CONDITIONS
  68. Appendix J — BUILDING INFORMATION SIGN
  69. Appendix K — CONSTRUCTION REQUIREMENTS FOR EXISTING AMBULATORY…
  70. Appendix L — REQUIREMENTS FOR FIREFIGHTER AIR REPLENISHMENT SY…
  71. Appendix M — HIGH-RISE BUILDINGS—RETROACTIVE AUTOMATIC SPRINKL…
  72. Appendix N — INDOOR TRADE SHOWS AND EXHIBITIONS
  73. Appendix O — VALET TRASH AND RECYCLING COLLECTION IN GROUP R-2…
  74. Appendix P — TEMPORARY HAUNTED HOUSES, GHOST WALKS AND SIMILAR…
  75. Appendix Q — COMMUNITY WILDLAND-URBAN INTERFACE (WUI) FIRE HAZ…

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