§ 14.32.220. Appendix B amended—Fire flow requirements for buildings.

International Fire Code Appendix B sections B102.1, B103.1, B103.2, B104.2, B105.1, B105.2 and Table B105.1 are amended; section B103.3 is replaced and sections B105.2.1, B105.2.2, Figure B105.1 and Table B105.2 are added to read as follows:

B102.1 Definitions. For the purpose of this appendix, certain terms are defined as follows:

FIRE-FLOW CALCULATION AREA. The gross floor area, in square feet (m ), used to determine the required fire flow. Buildings on the same lot that do not meet the setback to property line requirements of International Building Code chapter 6, Table 602, shall be treated as a single fire area.

LIMITED WATER SUPPLY SPRINKLER SYSTEM is an integrated system of piping and listed fire protection devices. Limited water supply sprinkler system components are installed in accordance with NFPA 13, NFPA 13R or NFPA 13D as applicable to the occupancy type then connected to a water supply capable of providing the required density for the most remote four sprinkler heads.

Definitions not added or amended will remain as provided in B102.1.

B103.1 Decreases. Not adopted.

B103.2 Increases. Not adopted.

B103.3 Areas without water supply systems. Limited water supply systems may be installed in accordance with provisions set forth by the fire code official. See figure B105.1.

B104.2 Area separation. Portions of buildings, which are separated by firewalls without openings, constructed in accordance with the International Building Code, are allowed to be considered as separate fire-flow calculation areas. Buildings in urban growth areas shall be limited to one firewall separation.

B105.1 One- and two-family dwellings and townhouses. Not adopted.

B105.2 Buildings other than one- and two-family dwellings. The minimum fire-flow for buildings other than one- and two-family dwellings shall be as specified in Table B105.1 and Figure B105.1. Where sprinkler systems are substituted for a reduction in construction type, the lesser construction type shall be used to determine fire flow.

Exceptions:

1. Buildings which require five hundred gallons per minute or less after applying the required modifications are exempt from the fire flow requirement.

2. Buildings protected with an approved automatic fire sprinkler system installed in accordance with nationally recognized standards need only provide the required water supply for the system design, provided such systems is not required by other sections of the code.

8105.2.1 Modifications.

1. A reduction in required fire flow of up to fifty percent, as approved, is allowed when the building is provided with an approved automatic sprinkler system installed in accordance with Section 903.3.1.1 or 903.3.1.2 of the International Fire Code.

2. Where the mitigated fire flow is less than five hundred gpm and the occupancy is not an H or an I occupancy a limited supply sprinkler system may be used.

The fire-flow requirement shall be adjusted based on the occupancy classification as specified in Table B105.2.

B105.2.2 Duration. Water supplies shall be capable of providing the required flow for at least one hour for flows of two thousand gallons per minute or less, for two hours for flows greater than two thousand gallons per minute, and for three hours for flows greater than three thousand gallons per minute.

Exception: Buildings that do not exceed the square footage at the five hundred gpm requirement do not need to adjust the fire flow based on the occupancy.

The fire-flow requirement for buildings protected throughout with an approved automatic fire detection system that includes a central station monitoring installed in accordance with the provisions of NFPA72, may be reduced an additional two hundred fifty gallons per minute.

Figure B105.1
Find the fire flow required based on construction type, apply surcharge or credit for occupancy type on Table B105.1.

TABLE B105.1
MINIMUM REQUIRED FIRE-FLOW

CONSTRUCTION TYPE
FIRE FLOW (GALLONS PER MINUTE)	I A&B	II-A III A	IV-H.T. V-A	II-B III-B	V-B
	TOTAL FIRE AREA IN SQUARE FEET
500	5,500	3,700	2,600	2,100	1,600
750	7,800	5,000	3,500	2,700	2,000
1,000	11,100	6,800	4,700	3,500	2,400
1,250	15,900	9,300	6,200	4,500	2,900
1,500	22,750	12,700	8,200	5,900	3,600
1,750	30,200	17,000	10,900	7,900	4,800
2,000	38,700	21,800	12,900	9,800	6,200
2,250	48,300	24,200	17,400	12,600	7,700
2,500	59,000	33,200	21,300	15,400	9,400
2,750	70,900	39,700	25,500	18,400	11,300
3,000	83,700	47,100	31,100	21,800	13,400
3,250	97,700	54,900	35,200	25,900	15,600
3,500	112,700	63,400	40,600	29,300	18,000
3,750	128,700	72,400	46,400	33,500	20,600
4,000	145,900	82,100	52,500	37,900	23,300
4,250	164,200	92,400	59,100	42,700	26,300
4,500	183,400	103,100	66,000	47,700	29,300
4,700	203,700	114,600	73,300	53,000	32,600
5,000	225,200	126,700	81,100	58,600	36,000
5,250	247,700	139,400	89,200	65,400	39,600
5,500	271,200	152,600	97,700	70,600	43,400
5,750	295,900	166,500	106,500	77,000	47,400
6,000	UNLIMITED	UNLIMITED	115,800	83,700	51,500
6,200	UNLIMITED	UNLIMITED	125,500	90,600	55,700
6,500	UNLIMITED	UNLIMITED	135,500	97,900	60,200
6,750	UNLIMITED	UNLIMITED	145,800	106,800	64,800
7,000	UNLIMITED	UNLIMITED	156,700	113,200	69,600
7,250	UNLIMITED	UNLIMITED	167,900	121,300	74,600
7,500	UNLIMITED	UNLIMITED	179,400	129,600	79,800
7,750	UNLIMITED	UNLIMITED	191,400	138,300	85,100
8,000	UNLIMITED	UNLIMITED	UNLIMITED	UNLIMITED	UNLIMITED

 

TABLE B105.2
OCCUPANCY FIRE FLOW MODIFIERS

PERCENTAGE OF BASE FIRE FLOW	OCCUPANCY GROUPS
CREDITS:
-25%	S-2, I-1, I-2, I-3, R-1, R-2
-20%	E-Daycare, A-1, A-2, A-3, A-4
-15%	E, I-4
-10%	A-2, A-5, B, R-4
SURCHARGES:
10%	S-1, M-FUEL DISPENSING
15%	H-4, S-1 AIRCRAFT REPAIR, VEHICLE REPAIR
20%	H-3
25%	H-1, H-2, H-5

 

(Ord. No. 14388, § 1(Attach. 1), 8-3-2010; Ord. No. 14906, § 1(Att. A), 6-25-2013; Ord. No. 15648 , § 1(Att. A, § I), 8-7-2018)