B105 Fire-Flow Requirements for Buildings

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).

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

APPENDIX B—FIRE-FLOW REQUIREMENTS FOR BUILDINGS

Exceptions & meaning →

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.

Exceptions & meaning →

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:

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

Exceptions & meaning →