15.12.9000 Appendices adopted.
Appendices B, E, F, and G of the IFC are adopted, with the following amendments:
SECTION B101
GENERAL
B101. Scope. Fire flow requirements shall be determined by the Fire Marshal. The procedure for determining fire flow requirements for buildings or portions of buildings hereafter constructed shall be in accordance with this appendix.
SECTION B102
DEFINITIONS
B102. Definitions. For the purpose of Appendix B, certain terms are defined as follows:
“FIRE AREA”. The floor area, in square feet, used to determine the required fire flow.
“FIRE FLOW”. The flow rate of a water supply, measured at 20 psi (137.9kPa) residual pressure, that is available for fire fighting.
“ADEQUATE PUBLIC WATER SYSTEM”. A water system that meets Washington State requirements of a public water system and provides minimum fire flow as required by the Fire Marshal.
SECTION B103
MODIFICATIONS
B103.1 Decreases. Fire-flow requirements may be modified downward by the Fire Marshal for isolated buildings or a group of buildings in rural areas or small communities where the development of full fire-flow requirements is impractical.
B103.2 Increases. Fire-flow may be modified upward by the Fire Marshal where conditions indicate an unusual susceptibility to group fires or conflagrations. An upward modification shall not be more than twice that required for the building under consideration.
SECTION B104
FIRE AREA
B104.1 General. The fire area shall be the total floor area of all floor areas within the exterior walls, and under the horizontal projections of the roof of a building, except as modified in this section.
B104.2 Area separation. Portions of buildings which are separated by one or more four-hour fire walls constructed in accordance with the Building Code, without openings and provided with a 30-inch (762 mm) parapet, are allowed to be constructed as separate fire areas.
B104.3 Type IA and Type I-B. Construction. The fire area of buildings constructed of Type IA and Type I-B construction shall be the area of the three largest successive floors.
SECTION B105
FIRE FLOW REQUIREMENTS FOR BUILDINGS
B105.1 General. Applicants for building permits shall present proof of available fire flow in the form of a letter which states that the purveyor can supply the required amount of fire flow for the required duration.
B105.2 One and two family dwellings. The minimum fire flow and flow duration requirements for one and two-family dwellings having a fire area in excess of 3,600 square feet (344.5 m2) shall not be less than that specified in Table B105.1(2). Table B105.1(1) is not adopted.
EXCEPTIONS:
1. A reduction in required fire flow of 75 percent, as approved by the Fire Marshal is allowed when the building is provided with an approved automatic sprinkler system.
2. Remodels or additions to legally existing one and two family dwellings where the added square footage does not exceed 60% of the square footage of the original structure.
B105.2.1 Urban Areas. As a requirement of residential subdivision or short subdivision, the minimum fire flow requirements for one and two family dwellings within an urban growth boundary shall be 1,000 gallons (3,785 L) per minute supplied for sixty (60) minutes duration.
B105.2.2 Rural Areas. As a requirement of residential subdivision or short subdivision, the minimum fire flow requirements for one and two family dwellings outside of an urban growth boundary shall be 500 gallons (1,895 L) per minute supplied for thirty (30) minutes duration. Fire flow requirements for those areas identified as Wildland Urban Interface/Intermix by CCC 15.13.030 shall be provided in accordance with CCC 15.12.917.
B105.2.3 Main Extensions. When development occurs within an urban growth boundary or within 1,000 feet or an adequate public water system outside of an urban growth boundary water mains shall be extended to and throughout the development site for the purposes of supplying the required fire flow.
EXCEPTION: Where a short subdivision occurs outside of an urban growth boundary that involves not more than two lots in its entirety and is located within 1,000 feet of an adequate public water system water main extensions may not be required if in the opinion of the Fire Marshal and the fire district chief the level of fire fighting capability will not be impaired.
B105.2.4 Fire Hydrants on Main Extensions. When water mains are extended from an existing public water system capable of supplying all or a portion of the required fire flow, fire hydrants shall be installed throughout the development site in accordance with Section 508.5.
B105.2.5 Where the public water system is incapable of supplying a minimum of 100 gallons (379 L) per minute for 30 minutes duration fire hydrants may be omitted subject to the provisions of subsection (e) below.
B105.2.6 Satellite Water Systems. Satellite water systems capable of supplying all or a portion of the required fire flow for the required duration may be approved. Such systems shall be provided with fire hydrants and mains in accordance with Section 508.5.
B105.2.7 Where a satellite water system is incapable of supplying a minimum of 100 gallons (379 L) per minute for 30 minutes duration fire hydrants may be omitted subject to the provisions of subsection B105.10.
B105.2.8 When satellite water systems are developed on an interim basis they shall be connected to the surrounding or extending public water system immediately upon the system’s availability.
B105.2.9 Methods of Achieving Required Flows. Fire flow requirements may be satisfied or reduced according to Table B105.2.9. Where fire flow is not provided in the full amount by a public water system the side and rear setbacks for all buildings shall be increased to thirty (30) feet.
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Method |
Credit/Reduction |
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Extension of an existing Public Water System capable of supplying at least 100 gpm for 30 minutes-rural areas or 60 minutes-urban area. |
Quantity actually supplied. |
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Development of a Satellite or Interim Satellite Water System capable of supplying at least 100 gpm for 30 minutes. |
Quantity actually supplied. |
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Automatic Fire Sprinkler System. |
75% reduction of required fire flow. |
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Fire District Tanker Credit. |
250 gallon per minute fire flow credit. |
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Class A or B or other Noncombustible Roof Covering and creation of a 30 foot defensible space in accordance with Clark County Code Section 14.05.501.4. |
250 gallon per minute fire flow credit. |
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Increased defensible space. |
Credit proportional to the increase not to exceed 325 gallons per minute total fire flow credit due to the creation of defensible spaces. |
In the case where a local fire district has no tanker credit alternate water supplies may be approved subject to the concurrence of the Fire Marshal and the local fire chief provided that the total credit for such alternate supply does not exceed 125 gallons per minute of fire flow.
B105.2.10 Future Provisions. Where an extended public or satellite water system is incapable of supplying at least 100 gpm for 30 minutes duration fire hydrants may be omitted provided that an agreement acceptable to the fire marshal exists whereby the fire hydrants will be installed at such time as the system is capable of supplying fire flow in excess of 100 gallons per minute.
B105.3 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 B-105.1(2). Table B105(2) is not adopted.
EXCEPTION: 1. A reduction in fire flow of up to seventy-five percent (75%) as approved by the Fire Marshal, is allowed when the building is provided with an approved automatic sprinkler system. The resulting fire flow shall not be less than 1,000 gallons per minute (3,785 L/min.).
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FIRE FLOW CALCULATION AREA (square feet) |
FIRE FLOW (gallons per minute)b |
FLOW DURATION (hours) |
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Type IA and IBa |
Type IIA and IIBa |
Type IV and V-Aa |
Type IIB and IIIBa |
Type V-Ba |
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0 – 16,000 |
0 – 8,000 |
0 – 6,000 |
0 – 4,000 |
0 – 2,000 |
1,000 |
2 |
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16,001 – 19,300 |
8,001 – 10,200 |
6,001 – 7,100 |
4,001 – 4,900 |
2,001 – 2,900 |
1,250 |
2 |
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19,301 – 22,700 |
8,001 – 12,700 |
7,101 – 8,200 |
4,901 – 5,900 |
2,901 – 3,600 |
1,500 |
2 |
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(Remainder of table is as stated in International Fire Code) |
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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. Types of Construction are based on the International Building Code.
b. Measured at 20 psi.
(Sec. 58 of Ord. 1985-05-28; amended by Sec. 29 of Ord. 1990-02-01; amended by Sec. 15 of Ord. 1990-10-46; amended by Sec. 29 of Ord. 1996-02-02; amended by Sec. 1 (Exh. A) of Ord. 2004-06-05; amended by Sec. 42 of Ord. 2007-06-19; amended by Sec. 1 of Ord. 2008-06-02; amended by Sec. 28 of Ord. 2016-07-02)