Chapter 15.06
WILDLAND-URBAN INTERFACE CODE

Sections:

15.06.005    Adoption of wildland-urban interface code.

15.06.010    Amendments to Chapter 1, Scope and Administration.

15.06.020    Amendments to Chapter 2, Definition.

15.06.030    Amendments to Chapter 3, Wildland-Urban Interface Areas.

15.06.040    Amendments to Chapter 4, Wildland-Urban Interface Area Requirements.

15.06.050    Amendments to Chapter 5, Special Building Construction Regulations.

15.06.060    Amendments to Chapter 6, Fire Protection Requirement.

15.06.070    Amendments to Chapter 7, Referenced Standards.

15.06.080    Adoption and amendment of appendices.

15.06.005 Adoption of wildland-urban interface code.

The city hereby adopts the 2015 International Wildland-Urban Interface Code with amendments identified in WAC 51-54A-8200 Appendix N and local amendments as defined in Section 15.06.010 et seq. (Ord. 1533 § 8 (Exh. 82) (part), 2017).

15.06.010 Amendments to Chapter 1, Scope and Administration.

Chapter 1 of the International Wildland-Urban Interface Code, 2015 Edition, is adopted with local amendments and amendments consistent with WAC 51-54A-8200 Appendix N as follows:

101.1 Title. These regulations shall be known the Wildland-Urban Interface Code of the City of Chelan, hereinafter referred to as “this code.”

101.5 Additions or alterations. Additions or alterations may be made to any building or structure without requiring the existing building or structure to comply with all of the requirements of this code, provided the addition or alteration conforms to that required for a new building or structure.

EXCEPTION: Provisions of this code that specifically apply to existing conditions are retroactive. See Sections 402.3, 601.1 and Appendix A.

Additions or alterations shall not cause the existing building or structure to become unsafe. An unsafe condition shall be deemed to have been created if an addition or alteration will cause the existing building or structure to become structurally unsafe or overloaded; will not provide adequate access in compliance with the provisions of this code or will obstruct existing exits or access; will create a fire hazard; will reduce required fire resistance or will otherwise create conditions dangerous to human life.

[A] 103.1 Creation of enforcement agency. The department of Planning and Building is the enforcement agency, and the building official shall be known as the code official. The code official shall consult the appropriate fire marshals of fire districts serving the subject properties under review through the permit review process.

[A] 106.1 General. To determine the suitability of alternative materials and methods and to provide for reasonable interpretations of the provisions of this code, there shall be and hereby is created a board of appeals consisting of the Hearing Examiner consistent with CMC 15.04.070. The Hearing Examiner shall adopt reasonable rules and regulations for conducting its investigations and shall render decisions and findings in writing to the code official, with a duplicate copy to the applicant.

[A] 106.2 Limitations of authority. The Hearing Examiner shall not have authority relative to interpretation of the administrative provisions of this code and shall not have authority to waive requirements of this code.

[A] 107.3 Work exempt from permit. Unless otherwise provided in the requirements of the International Building Code or International Fire Code, a permit shall not be required for the following:

1. One-story detached accessory structures used as tool and storage sheds, playhouses and similar uses, provided the floor area does not exceed 200 square feet (18.58 m2) and the structure is located more than 50 feet (15,240 mm) from the nearest adjacent structure.

2. Fences not over 6 feet (1,829 mm) high.

Exemption from the permit requirements of this code shall not be deemed to grant authorization for any work to be done in any manner in violation of the provisions of this code or any other laws or ordinances of this jurisdiction.

The code official is authorized to stipulate conditions for permits. Permits shall not be issued where public safety would be at risk, as determined by the code official.

108.3 Site plan. In addition to the requirements for plans in the International Building Code, the code official may require site plans which include topography, width and percent of grade of access roads, landscape and vegetation details, locations of structures or building envelopes, existing or proposed overhead utilities, occupancy classification of buildings, types of ignition resistant construction of buildings, structures and their appendages, roof classification of buildings, and site water supply systems. The code official is authorized to waive or modify the requirement for a site plan.

108.4 Vegetation management plans. When required by the code official or when utilized by the permit applicant pursuant to Section 502, vegetation management plans shall be prepared and shall be submitted to the code official for review and approval as part of the plans required for a permit. See Appendix B.

108.7 Vicinity plan. When required by the code official, the requirements for site plans shall include details regarding the vicinity within 300 feet (91,440 mm) of property lines, including other structures, slope, vegetation, fuel breaks, water supply systems and access roads.

(Ord. 1533 § 8 (Exh. 82) (part), 2017).

15.06.020 Amendments to Chapter 2, Definition.

Chapter 2 of the International Wildland-Urban Interface Code, 2015 Edition, is adopted with amendments as follows:

WILDLAND-URBAN INTERFACE AREA. That geographical area where structures and other human development meets or intermingles with wildland or vegetative fuels.

The wildland-urban interface area specifically contains:

A. The primary zone defined as: Property and structures that are located within moderate or above wildland, intermix or interface risk areas establish the primary zone and are subject to all the provisions of the code. Within the primary zone are:

1. Moderate, High, and Very High Wildland Areas represented by relatively continuous fuel with limited presence of structures, roads and other human-caused disturbances.

2. Moderate, High, and Very High Intermix areas characterized by a higher density of structures, roads and other infrastructure breaking up the continuity of natural fuel on the landscape.

3. Moderate and High Interface Areas which may be threatened by flame impingement on one or two sides, ember cast and smoke from adjacent areas.

B. The secondary zone defined as: Property and structures within the city limits that are not located within the moderate or above wildland, intermix or interface risk areas are included in the secondary zone.

(Ord. 1533 § 8 (Exh. 82) (part), 2017).

15.06.030 Amendments to Chapter 3, Wildland-Urban Interface Areas.

Chapter 3 of the International Wildland-Urban Interface Code, 2015 Edition, is adopted with amendments as follows:

302.1 Declaration. Specific boundaries of natural or man-made features of Wildland-Urban interface areas shall be as shown on the Wildland-Urban Interface Area map. These areas include:

A. The primary zone defined as: Property and structures that are located within moderate or above wildland, intermix or interface risk areas establish the primary zone and are subject to all the provisions of the code. Within the primary zone are:

1. Moderate, High, and Very High Wildland Areas represented by relatively continuous fuel with limited presence of structures, roads and other human-caused disturbances.

2. Moderate, High, and Very High Intermix areas characterized by a higher density of structures, roads and other infrastructure breaking up the continuity of natural fuel on the landscape.

3. Moderate and High Interface Areas which may be threatened by flame impingement on one or two sides, ember cast and smoke from adjacent areas.

B. The secondary zone defined as: Property and structures within the City limits that are not located within the moderate or above wildland, intermix or interface risk areas are included in the secondary zone. Properties in the secondary zone shall be regulated equivalent to the Moderate wildland, intermix, or interface areas, provided that properties within the secondary zone are exempt from Chapter 6 defensible space requirements.

302.2 Mapping. The wildland-urban interface areas shall be recorded on maps, and on file with the City Clerk, and available for inspection by the public.

302.3 Review of wildland-urban interface areas. The code official shall reevaluate and recommend modification to the wildland-urban interface areas in accordance with Section 302.1 on a 3-year basis or more frequently as deemed necessary by the legislative body.

302.4 Interpretation. Where uncertainty exists as to any of the boundaries as shown on the Wildland-Urban Interface Area map, the following rules apply:

A. Where a Wildland-Urban Interface Area boundary is indicated as approximately following roads, alleys, waterbodies, topographic lines or other manmade or natural features, the boundaries shall be construed as such.

B. Where a Wildland-Urban Interface Area boundary divides an ownership, the location of the boundary, unless it is indicated by dimensions shown on the map, shall be determined by scale measurement.

(Ord. 1533 § 8 (Exh. 82) (part), 2017).

15.06.040 Amendments to Chapter 4, Wildland-Urban Interface Area Requirements.

Chapter 4 of the International Wildland-Urban Interface Code, 2015 Edition, is adopted with the addition of Section 401.4.

401.4 Consistency with City Development Standards. Section 402 Applicability, Section 403 Access, Section 404 Water Supply, and Section 405 shall be read in conjunction with Development Standards adopted pursuant to Chapter 25.05 CMC. The most restrictive standards shall control.

Elements of Section 402 are amended consistent with WAC 51-54A-8200 Appendix N as follows:

402.1.1 Access. New subdivisions, as determined by this jurisdiction, shall be provided with fire apparatus access roads in accordance with the International Fire Code.

402.1.2 Water supply. New subdivisions, as determined by this jurisdiction, shall be provided with water supply in accordance with the International Fire Code.

402.2 Individual structures. Individual structures shall comply with Sections 402.2.1 and 402.2.2.

402.2.1 Access. Individual structures hereafter constructed or relocated into or within wildland-urban interface areas shall be provided with fire apparatus access in accordance with the International Fire Code.

402.2.2 Water supply. Individual structures hereafter constructed or relocated into or within wildland-urban interface areas shall be provided with a conforming water supply in accordance with the International Fire Code.

EXCEPTIONS:

1. Structures constructed to meet the requirements for the class of ignition-resistant construction specified in Table N503.1 for a nonconforming water supply.

2. Buildings containing only private garages, carports, sheds and agricultural buildings with a floor area of not more than 600 square feet (56 m2).

402.3 Existing conditions. Existing address markers, roads and fire protection equipment shall be in accordance with the International Fire Code.

403 Access. This section not adopted.

404 Water supply. This section not adopted.

(Ord. 1533 § 8 (Exh. 82) (part), 2017).

15.06.050 Amendments to Chapter 5, Special Building Construction Regulations.

Chapterwide change: References to “extreme hazard” equate to “very high” in the city’s wildland-urban interface area. Regulations identified as applicable to “extreme hazard” areas shall apply to areas mapped as “very high” in the city’s wildland-urban interface area. Properties in the secondary zone shall be regulated equivalent to the moderate wildland, intermix, or interface areas.

Section 501.1, Scope, is amended as follows:

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 200 square feet (18.58 m2) in floor area where located not less than 50 feet (15,240 mm) from buildings containing habitable spaces.

2. Agricultural buildings not less than 50 feet (15,240 mm) from buildings containing habitable spaces.

Table 503.1 is amended consistent with WAC 51-54A-8200, Appendix N, as follows:

Table 503.1

Ignition-Resistant Constructiona

-

-

-

Fire Hazard Severity

Moderate Hazard

High Hazard

Extreme Hazard

Water Supplyb

Water Supplyb

Water Supplyb

Defensible Spacec

Conforming

Nonconforming

Conforming

Nonconforming

Conforming

Nonconforming

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

- aAccess shall be in accordance with Section 402.

- bWater supply shall be 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.

- cConformance based on Section 603.

(Ord. 1533 § 8 (Exh. 82) (part), 2017).

15.06.060 Amendments to Chapter 6, Fire Protection Requirement.

Chapterwide change: References to “extreme hazard” equate to “very high” in the city’s wildland-urban interface area. Regulations identified as applicable to “extreme hazard” areas shall apply to areas mapped as “very high” in the city’s wildland-urban interface area. (Ord. 1533 § 8 (Exh. 82) (part), 2017).

15.06.070 Amendments to Chapter 7, Referenced Standards.

Chapter 7 is adopted without amendment. (Ord. 1533 § 8 (Exh. 82) (part), 2017).

15.06.080 Adoption and amendment of appendices.

A. Appendix A is adopted.

B. Appendix B is adopted with the following amendment to Section B101.1:

B101.1 Scope. Based on scale or location of the development within high or very high fire risk areas, the code official may require preparation of a vegetation management plan to demonstrate optimal implementation and on-going management of vegetation. Vegetation management plans shall be submitted to the code official for review and approval as part of the plans required for a permit.

C. Appendix C is adopted. (Ord. 1533 § 8 (Exh. 82) (part), 2017).