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WUIC CODE REQUIREMENTS FOR NON-COMBUSTIBLE MATERIALS <br />WUIC 504.5 Exterior walls. <br />Exterior walls of buildings or structures shall be constructed with one of the following methods: <br />1. Materials approved for not less than 1 -hour fire -resistance -rated construction on the exterior <br />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 <br />labeled for exterior use and meet the requirements of Section 2303.2 of the International <br />Building Code. <br />5. Ignition -resistant materials complying with Section 503.2 on the exterior side. <br />Such material shall extend from the top of the foundation to the underside of the roof <br />sheathing. <br />WUIC 503.2 Ignition -resistant building material. <br />Ignition -resistant building materials shall comply with any one of the following: <br />1. Material shall be tested on all sides with the extended ASTM E 84 (UL 723) test or <br />ASTM E 2768, except panel products shall be permitted to test only the front and back <br />faces. Panel products shall be tested with a ripped or cut longitudinal gap of 1/8 <br />inch (3.2mm).Materials that, when tested in accordance with the test procedures set forth in <br />ASTM E 84 or UL 723 for a test period of 30 minutes, or with ASTM E 2768, comply with <br />the following: <br />1.1. Flame spread. Material shall exhibit a flame spread index not exceeding 25 and <br />shall not show evidence of progressive combustion following the extended 30 - <br />minute test. <br />1.2. Flame front. Material shall exhibit a flame front that does not progress more <br />than 10 '/ feet (3200 mm) beyond the centerline of the burner at any time <br />during the extended 30 -minute test. <br />1.3. Weathering. Ignition -resistant building materials shall maintain their <br />performance in accordance with this section under conditions of use. Materials <br />shall meet the performance requirements for weathering (including exposure to <br />temperature, moisture and ultraviolet radiation) contained in the following <br />standards, as applicable to the materials and the conditions of use: <br />1.3.1. Method A "Test Method for Accelerated Weathering of Fire - <br />Retardant -Treated Wood for Fire Testing" in ASTM D 2898, for fire retardant - <br />treated wood, wood -plastic composite and plastic lumber <br />materials. <br />1.3.2. ASTM D 7032 for wood -plastic composite materials. <br />1.3.3. ASTM D 6662 for plastic lumber materials. <br />1.4. Identification. All materials shall bear identification showing the fire test results. <br />Exception, Materials comprised of a combustible core and a noncombustible <br />exterior covering, comprised of made from either aluminum at a minimum 0.019 inch <br />(0.48 mm) thickness or corrosion -resistant steel at a minimum 0.0149 inch (0.38 mm) <br />thickness shall not be required to be tested with a ripped or out longitudinal gap. <br />2. Noncombustible material. Material that complies with the requirements for <br />noncombustible materials in Section 202. <br />3. fire-retardant4reated wood. Fire -retardant -treated wood identified for exterior use and <br />meeting the requirements of Section 2303.2 of the International Building Code. <br />4. Fire -retardant -treated wood roof coverings. Roof assemblies containing fire-retardanttreated <br />