Section 50.43. Classification

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(a) NFPA Standard. Interior finish materials shall be classified in accordance with NFPA Standard 255, tests of surface burning characteristics of building materials, 1979 Edition as listed in this section.
(b) Class A Interior Finish. Flame Spread 0-25 includes any material classified at 25 or less on the test scale. Any element thereof when so tested shall not continue to propagate fire.
(c) Class B Interior Finish. Flame Spread 26-75 includes any material classified at more than 25 but not more than 75 on the test scale.
(d) Class C Interior Finish. Flame Spread 76-200 includes any material classified at more than 75 but not more than 200 on the test scale.
(e) Exposed portions of structural wood members complying with the size requirements in § 50.11(c) (relating to construction tables) shall not be considered interior finishes.

                    
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