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<br />E. A nonconforming water supply is any water system or source that does not comply with <br />Section 404, including situations where there is no water supply for structure protection <br />or fire suppression. <br />504.5 Exterior walls. Exterior walls of buildings or structures shall be constructed with one of the <br />following methods: <br /> <br />1. Materials approved for not less than 1-hour fire-resistance-rated construction on the exterior side. <br />2. Approved noncombustible materials. <br />3. Heavy timber or log wall construction. <br />4. Fire-retardant-treated wood on the exterior side. The fire-retardant-treated wood shall be labeled for <br />exterior use and meet the requirements of Section 2303.2 of the International Building Code. <br />5. Ignition-resistant materials on the exterior side. Ignition-resistant materials shall include materials <br />treated with a fire retardant product tested in accordance with ASTM E84 or approved by an <br />independent testing laboratory. Testing shall be performed by a certified scientific and objective testing <br />agency such as Underwriters Laboratories or CSA Group Testing and Certification Inc. The Code official <br />shall have authority to approve of testing agencies. The applicant shall provide an affidavit confirming <br />that all fire retardant products were applied according to the product specifications and shall record a <br />notice to title notifying future landowners of requirements for future reapplication of the product. <br /> <br />Such material shall extend from the top of the foundation to the underside of the roof sheathing. <br />504.7 Appendages and projections. Unenclosed accessory structures attached to building with habitable <br />spaces and projections, such as decks, shall be a minimum of 1-hour fire resistance-rated construction, heavy <br />timber construction or constructed of one of the following: <br />1. Approved noncombustible materials, <br />2. Fire-retardant treated wood identified for exterior use and meeting the requirements of Section <br />2303.2 of the International Building Code, <br />3. Ignition resistant building materials in accordance with section 503.2. or <br />504.10.1 Vent locations. Attic ventilation openings shall not be located in soffits, in eave overhangs, <br />between rafters at eaves, or in other overhang areas, except when openings are approved by Cal Fire, <br />approved by an independent testing laboratory such as Underwriters Laboratories, American National <br />Standards Institute (ANSI), or ICC Evaluation Service (ICC-ES), or approved by the Code Official per <br />Section 105.2. Gable end and dormer vents shall be located not less than 10 feet (3048 mm) from lot <br />lines. Underfloor ventilation openings shall be located as close to grade as practical. <br />505.7 Appendages and projections. Unenclosed accessory structures attached to building with habitable <br />spaces and projections, such as decks, shall be a minimum of 1-hour fire resistance-rated construction, heavy <br />timber construction or constructed of one of the following: <br />1. Approved noncombustible materials, <br />2. Fire-retardant treated wood identified for exterior use and meeting the requirements of Section <br />2303.2 of the International Building Code, <br />3. Ignition resistant building materials in accordance with section 503.2 or