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Internaltional Fire Code Fire Flow
Requirements For Buildings.xls
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SECTION B105 |
| FIRE-FLOW
REQUIREMENTS FOR BUILDINGS |
| B105.1 One- and
two-family dwellings. |
| The
minimum fire-flow requirements for one- and two-family
dwellings having a fire-flow calculation area which does not
exceed 3,600 square feet (344.5 m2) shall be 1,000 gallons
per minute (3785.4 L/min). Fire-flow and flow duration for
dwellings having a fire-flow calculation area in excess of
3,600 square feet (344.5 m2) shall not be less than that
specified in Table B105.1. |
| All
new one- and two-family and townhouse dwellings not covered
by Exception No. 1, Exception No. 2, or Exception No. 3 of
B105.1 shall be required to meet the fire-flow requirements
of Appendix B. |
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Exception No.1:
A reduction in required fire flow of 50 percent, as
approved, is allowed when the building is provided with an
approved automatic sprinkler system. |
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Exception No. 2:
One- and two-family and townhouse dwellings not greater than
3600 square feet which are constructed on existing, legal
building lots, as defined in Section 202, are not subject to
Appendix B if they: |
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1
. |
Meet definition
#1 of "existing, legal building lot" and meet the fire-flow
requirements of the Insurance Services Office (ISO) Formula
for Needed Fire Flow; or |
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2
. |
Meet definition
#1 of "existing legal building lot" and have a fire hydrant
within 500 feet of all parts of the home, measured by way of
hard surface road, and the hydrant flows at least 750 gpm
with 20 psi residual pressure; or |
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3
. |
Meet definition
#1 of "existing legal building lot" and have a fire hydrant
within 500 feet of all parts of the home, measured by way of
hard surface road, and the hydrant flows less than 750 gpm
but not less than 500 gpm with 20 psi residual pressure and
there is a secondary fire hydrant within 1,000 feet of the
home that flows no less than 1,000 gpm with 20 psi residual
pressure; or |
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4
. |
Meet definition
#2 or #3 of "existing building lot" in which case they shall
meet the fire-flow requirements set forth by the fire code
official at the time the plat was approved or preliminarily
approved. In the
event the fire-flow requirements were not noted at the time
of approval or preliminary approval, then Appendix B shall
apply unless: |
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4.1 There is a
fire hydrant within 500 feet of all parts of the home,
measured by way of hard surface road, and the hydrant flows
at least 750 gpm with 20 psi residual pressure: or |
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4.2
There is a fire hydrant within 500 feet of all parts
of the home, measured by way of hard surface road, and the
hydrant flows less than 750 gpm but not less than 500 gpm
with 20 psi residual pressure and there is a secondary fire
hydrant within 1,000 feet of the home that flows no less
than 1,000 gpm with 20 psi residual pressure; or |
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4.3 The fire-flow
requirements of the Insurance Service Office (ISO) Formula
for Needed Fire Flow are met. |
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Exception No. 3:
One and two-family townhouse
dwellings which exceed 3,600 square feet and which are
constructed on "existing, legal building lots" shall
meet either the fire-flow requirements of the Insurance
Service Office (ISO) Formula for Needed Fire Flow or
Appendix B of the International Fire Code. |
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NOTE: See
International Fire Code amendments for definitions of an
existing legal building lot. |
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| TABLE B105.1 |
| MINIMUM REQUIRED
FIRE-FLOW AND FLOW DURATION FOR BUILDINGSa |
|
FIRE-FLOW CALCULATION AREA (square
feet) |
FIRE-FLOW (gallons per
minute)c |
FLOW DURATION (hours) |
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| Type IA and IBb |
Type IIA and IIIAb |
Type IV and V-Ab |
Type IIB and IIIBb |
Type V-Bb |
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|
0-22,700 |
0-12,700 |
0-8,200 |
0-5,900 |
0-3,600 |
1,500 |
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| 22,701-30,200 |
12,701-17,000 |
8,201-10,900 |
5,901-7,900 |
3,601-4,800 |
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 |
| 38,701-48,300 |
21,801-24,200 |
12,901-17,400 |
9,801-12,600 |
6,201-7,700 |
2,250 |
|
| 48,301-59,000 |
24,201-33,200 |
17,401-21,300 |
12,601-15,400 |
7,701-9,400 |
2,500 |
|
| 59,001-70,900 |
33,201-39,700 |
21,301-25,500 |
15,401-18,400 |
9,401-11,300 |
2,750 |
|
| 70,901-83,700 |
39,701-47,100 |
25,501-30,100 |
18,401-21,800 |
11,301-13,400 |
3,000 |
|
| 83,701-97,700 |
47,101-54,900 |
30,101-35,200 |
21,801-25,900 |
13,401-15,600 |
3,250 |
3 |
| 97,701-112,700 |
54,901-63,400 |
35,201-40,600 |
25,901-29,300 |
15,601-18,000 |
3,500 |
|
| 112,701-128,700 |
63,401-72,400 |
40,601-46,400 |
29,301-33,500 |
18,001-20,600 |
3,750 |
|
| 128,701-145,900 |
72,401-82,100 |
46,401-52,500 |
33,501-37,900 |
20,601-23,300 |
4,000 |
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| 145,901-164,200 |
82,101-92,400 |
52,501-59,100 |
37,901-42,700 |
23,301-26,300 |
4,250 |
|
| 164,201-183,400 |
92,401-103,100 |
59,101-66,000 |
42,701-47,700 |
26,301-29,300 |
4,500 |
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| 183,401-203,700 |
103,101-114,600 |
66,001-73,300 |
47,701-53,000 |
29,301-32,600 |
4,750 |
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| 203,701-225,200 |
114,601-126,700 |
73,301-81,100 |
53,001-58,600 |
32,601-36,000 |
5,000 |
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| 225,201-247,700 |
126,701-139,400 |
81,101-89,200 |
58,601-65,400 |
36,001-39,600 |
5,250 |
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| 247,701-271,200 |
139,401-152,600 |
89,201-97,700 |
65,401-70,600 |
39,601-43,400 |
5,500 |
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| 271,201-295,900 |
152,601-166,500 |
97,701-106,500 |
70,601-77,000 |
43,401-47,400 |
5,750 |
4 |
| 295,901-Greater |
166,501-Greater |
106,501-115,800 |
77,001-83,700 |
47,401-51,500 |
6,000 |
|
| — |
— |
115,801-125,500 |
83,701-90,600 |
51,501-55,700 |
6,250 |
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| — |
— |
125,501-135,500 |
90,601-97,900 |
55,701-60,200 |
6,500 |
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| — |
— |
135,501-145,800 |
97,901-106,800 |
60,201-64,800 |
6,750 |
|
| — |
— |
145,801-156,700 |
106,801-113,200 |
64,801-69,600 |
7,000 |
|
| — |
— |
156,701-167,900 |
113,201-121,300 |
69,601-74,600 |
7,250 |
|
| — |
— |
167,901-179,400 |
121,301-129,600 |
74,601-79,800 |
7,500 |
|
| — |
— |
179,401-191,400 |
129,601-138,300 |
79,801-85,100 |
7,750 |
|
| — |
— |
191,401-Greater |
138,301-Greater |
85,101-Greater |
8,000 |
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| 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. |
The minimum required fire
flow shall be allowed to be reduced by 25 percent for Group
R. |
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| b. |
Types of construction are
based on the International Building Code. |
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| c. |
Measured at 20 psi. |
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| B105.2 Buildings
other than one- and two-family dwellings. |
| The minimum
fire-flow and flow duration for buildings other than one-
and two-family dwellings shall be as specified in Table
B105.1. |
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Exception:
A reduction in required fire-flow of up to 75 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. The resulting fire-flow
shall not be less than 1,500 gallons per minute (5678 L/min)
for the prescribed duration as specified in Table B105.1. |
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