A finish schedule lists an interior wall finish as Class A under the IBC flame-spread classification. What flame-spread index range defines Class A?
Correct Answer
A) Class A: 0 through 25
IBC interior finish classification defines Class A as flame-spread index 0 through 25. Other choices describe Class B, Class C, or a range outside the standard Class A/B/C grouping.
Why This Is the Correct Answer
IBC interior finish classification defines Class A as flame-spread index 0 through 25. Other choices describe Class B, Class C, or a range outside the standard Class A/B/C grouping.
Why the Other Options Are Wrong
Option B: Class B: 26 through 75
In finishes, Class B: 26 through 75 is the wrong selection for Interior finish Class A: Class B: 26 through 75 is an IBC dimensional value for a different stair, door, or egress condition.
Option C: Class C: 76 through 200
The trap in C is Class C: 76 through 200. That selection is wrong because Class C: 76 through 200 is an IBC dimensional value for a different stair, door, or egress condition.
Option D: Outside Class A/B/C: 201 through 450
Choice D gives Outside Class A/B/C: 201 through 450. Its specific error: Outside Class A/B/C: 201 through 450 is an IBC dimensional value for a different stair, door, or egress condition.
Memory Technique
Link interior finish Class A to its book condition; a different condition means a different answer than Class A: 0 through 25.
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 A as flame-spread index 0 through 25.
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