A corridor finish is specified as IBC Class B interior wall finish. Which flame-spread index range corresponds to Class B?
Correct Answer
B) 26-75, the Class B range
IBC interior finish classification defines Class B as flame-spread index 26 through 75. Other choices correspond to Class A, Class C, or outside the Class A/B/C classification.
Why This Is the Correct Answer
IBC interior finish classification defines Class B as flame-spread index 26 through 75. Other choices correspond to Class A, Class C, or outside the Class A/B/C classification.
Why the Other Options Are Wrong
Option A: 0-25, the Class A range
In finishes, 0-25, the Class A range is the wrong selection for Interior finish Class B: 0-25, the Class A range is an IBC dimensional value for a different stair, door, or egress condition.
Option C: 76-200, the Class C range
Choice C gives 76-200, the Class C range. Its specific error: 76-200, the Class C range is an IBC dimensional value for a different stair, door, or egress condition.
Option D: 201-450, outside the standard A/B/C ranges
Choice D (201-450, outside the standard A/B/C ranges) is rejected because 201-450, outside the standard A/B/C ranges is an IBC dimensional value for a different stair, door, or egress condition.
Memory Technique
Use a index tab memory cue for interior finish Class B: the stem's condition unlocks 26-75, the Class B range.
Reference Hint
Open International Building Code 2021 or 2024; use IBC 2021/2024 Section 803 interior wall and ceiling finish classification to confirm that IBC interior finish classification defines Class B as flame-spread index 26 through 75.
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