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3.1.13.6. Corridors
1) Except as permitted by Sentence (2) and (3), the flame-spread rating shall be not more than 75 for the interior wall finish of
a) a public corridor,
b) a corridor used by the public in an assembly occupancy, or
c) a corridor serving classrooms.
2) The flame-spread rating for corridors specified in Sentence (1) is permitted to be waived, provided the flame-spread rating is not more than
a) 25 on the upper half of the wall, and
b) 150 on the lower half of the wall
3) Where the floor area is sprinklered, the flame-spread ratings for corridors specified in Sentence (1) and (2) shall be not more than 150
4) the flame-spread ratings specified in Sentence (1), (2) and (3) apply to occupancies in the corridor as well as to the corridor itself.
5) except as provided in Sentence (6), the interior ceiling finish of corridors and occupancies referred in Sentence (1) and (4) shall have a flame-spread rating not more than 25.
6) Where the floor area is sprinkelered throughout, the flame-spread rating of the interior ceiling finish of corridors and occupancies referred in Sentence (1) and (4) shall be not more than 150.
Question:
When are decorative wood finishes permitted in a public corridor?
Please have your answer by comments.