Section 503 Ignition-Resistant Construction and Material
Buildings and structures hereafter constructed, modified or relocated into or within wildland-urban interface areas shall meet the construction requirements in accordance with Table 503.1. Class 1, Class 2 or Class 3, ignition-resistant construction shall be in accordance with Sections 504, 505 and 506, respectively. Materials required to be ignition-resistant materials shall comply with the requirements of Section 503.2.
|FIRE HAZARD SEVERITY|
|Moderate Hazard||High Hazard||Extreme Hazard|
|Water Supplyb||Water Supplyb||Water Supplyb|
|Nonconforming||IR 2||IR 1||IR 1||IR 1|
|Conforming||IR 3||IR 2||IR 2||IR 1||IR 1||IR 1|
|1.5 × Conforming||Not Required||IR 3||IR 3||IR 2||IR 2||IR 1|
- Access shall be in accordance with Section 403.
- Conformance based on Section 603.
- Conformance based on Section 404.
- A nonconforming water supply is any water system or source that does not comply with Section 404, including situations where there is no water supply for structure protection or fire suppression.
Ignition-resistant building materials shall comply with any one of the following:
- 1.1. Flame spread. Material shall exhibit a flame spread index not exceeding 25 and shall not show evidence of progressive combustion following the extended 30-minute test.
- 1.2. Flame front. Material shall exhibit a flame front that does not progress more than 101/2 feet (3200 mm) beyond the centerline of the burner at any time during the extended 30-minute test.
- 1.3.1. Method A "Test Method for Accelerated Weathering of Fire-Retardant-Treated Wood for Fire Testing" in ASTM D 2898, for fire-retardant-treated wood, wood-plastic composite and plastic lumber materials.
- 1.3.2. ASTM D 7032 for wood-plastic composite materials.
- 1.3.3. ASTM D 6662 for plastic lumber materials.
- Noncombustible material. Material that complies with the requirements for noncombustible materials in Section 202.
- Fire-retardant-treated wood. Fire-retardant-treated wood identified for exterior use and meeting the requirements of Section 2303.2 of the International Building Code.
- Fire-retardant-treated wood roof coverings. Roof assemblies containing fire-retardant-treated wood shingles and shakes that comply with the requirements of Section 1505.6 of the International Building Code and classified as Class A roof assemblies as required in Section 1505.2 of the International Building Code.