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Section R315 Flame Spread and Smoke Density
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Wall and ceiling finishes shall have a flame-spread classification of not greater than 200.
Exception:
Flame-spread requirements for finishes shall not apply to trim defined as picture molds, chair rails, baseboards and handrails; to doors and windows or their frames; or to materials that are less than 1/28 inch (0.91 mm) in thickness cemented to the surface of walls or ceilings if these materials have a flame-spread characteristic no greater than paper of this thickness cemented to a noncombustible backing.
Wall and ceiling finishes shall have a smoke-developed index of not greater than 450.
Tests shall be made in accordance with ASTM E 84.
As an alternate to having a flame-spread classification of not greater than 200 and a smoke developed index of not greater than 450 when tested in accordance with ASTM E 84, wall and ceiling finishes, other than textiles, shall be permitted to be tested in accordance with NFPA 286. Materials tested in accordance with NFPA 286 shall meet the following criteria:
During the 40 kW exposure, the interior finish shall comply with Item 1. During the 160 kW exposure, the interior finish shall comply with Item 2. During the entire test, the interior finish shall comply with Item 3.
- During the 40 kW exposure, flames shall not spread to the ceiling.
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During the 160 kW exposure, the interior finish shall comply with the following:
- Flame shall not spread to the outer extremity of the sample on any wall or ceiling.
- Flashover, as defined in NFPA 286, shall not occur.
- The total smoke released throughout the NFPA 286 test shall not exceed 1,000 m2.
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