3.1.13.6.

(1) Except as permitted by Sentences (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,

(i) an assembly occupancy, or

(ii) a care or detention occupancy,

(c) a corridor serving classrooms, or

(d) a corridor serving sleeping rooms in a care or detention occupancy.

(2) The flame-spread rating limit specified in Sentence (1) does not apply to corridors referred to in Sentence (1) 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) The flame-spread rating limits specified in Sentences (1) and (2) for corridors referred to in Sentence (1) does not apply to a corridor in which the flame-spread rating is not more than 150 provided the floor area is sprinklered.

(4) The flame-spread rating limits specified in Sentences (1), (2) and (3) apply to occupancies in the corridor as well as to the corridor itself.

(5) Except in a floor area that is sprinklered and as permitted in Sentence (6), the interior ceiling finish of corridors and occupancies referred to in Sentences (1) and (4) shall have a flame-spread rating not more than 25.

(6) The flame-spread rating limits specified in Sentence (5) do not apply to a corridor in which the flame-spread rating is not more than 150 provided the floor area is sprinklered.