3.1.5.19. Combustible Piping Materials

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3.1.5.19. Combustible Piping Materials

1) Except as permitted by Clause 3.1.5.2.(1)(d) and Sentence (2) and (3), combustible piping and tubing and associated adhesives are permitted to be used in a building required to be of noncombustible construction provided that, except when concealed in a wall or concrete floor slab, they

a) have a flame-spread rating not more than 25, and

b) if used in a building described in Section 3.2.6., have a smoke developed classification not more than 50.