SPECIAL BUILDING CONSTRUCTION REGULATIONS
501.1 Scope. Buildings and structures shall be constructed in accordance with the International Building Code and this code.
Exceptions:
1. Accessory structures not exceeding 120 square feet (11 m2) in floor area when located at least 50 feet (15 240 mm) from buildings containing habitable spaces.
2. Agricultural buildings at least 50 feet (15 240 mm) from buildings containing habitable spaces.
501.2 Objective. The objective of this chapter is to establish minimum standards to locate, design and construct buildings and structures or portions thereof for the protection of life and property, to resist damage from wildfires, and to mitigate building and structure fires from spreading to wildland fuels. The minimum standards set forth in this chapter vary with the critical fire weather, slope and fuel type to provide increased protection, above the requirements set forth in the International Building Code, from the various levels of hazards.
The fire hazard severity of building sites for all buildings hereafter constructed, modified or relocated into wildland-urban interface areas shall be established in accordance with Appendix C.
The fire hazard severity is allowed to be reduced by implementing a vegetation management plan in accordance with Appendix B.
503.1 General. 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.
504.1 General. Class 1 ignition-resistant construction shall be in accordance with Section 504.
504.2 Roof covering. Roofs shall have a Class A roof covering or a Class A roof assembly. For roof coverings where the profile allows a space between the roof covering and roof decking, the space at the eave ends shall be firestopped to preclude entry of flames or embers.
On small screens, each row is shown as a card so every table heading and value remains visible.
| DEFENSIBLE SPACEc |
FIRE HAZARD SEVERITY | |||||
|---|---|---|---|---|---|---|
| Moderate Hazard | High Hazard | Extreme Hazard | ||||
| Water Supplyb | Water Supplyb | Water Supplyb | ||||
| Conformingd | Nonconforminge | Conformingd | Nonconforminge | Conformingd | Nonconforminge | |
| Nonconforming | IR 2 | IR 1 | IR 1 | IR 1 N.C. |
IR 1 N.C. |
Not Permitted |
| Conforming | IR 3 | IR 2 | IR 2 | IR 1 | IR 1 | IR 1 N.C. |
| 1.5 x Conforming | Not Required | IR 3 | IR 3 | IR 2 | IR 2 | IR 1 |
a. Access shall be in accordance with Section 402.
b. Subdivisions shall have a conforming water supply in accordance with Section 402.1.
IR 1 = Ignition-resistant construction in accordance with Section 504.
IR 2 = Ignition-resistant construction in accordance with Section 505.
IR 3 = Ignition-resistant construction in accordance with Section 506.
N.C. = Exterior walls shall have a fire-resistance rating of not less than 1-hour and the exterior surfaces of such walls shall be noncombustible. Usage of log wall construction is allowed.
c. Conformance based on Section 603.
d. Conformance based on Section 404.
e. 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.