A commercial building is being modified to include a new roof assembly. Which of the following fire ratings is required for the new roof assembly?
- A1-hour fire rating
- 2-hour fire rating
- C3-hour fire rating
- D4-hour fire rating
Exam tip
Always check the required fire ratings for new roof assemblies to ensure compliance with the code.
Why B is correct
Option B is correct as per Section 703.2.1 of the 2021 IBC, which requires a 2-hour fire rating for the new roof assembly in a commercial building. Option A is incorrect because it is not the minimum required fire rating. Option C and D are also incorrect as they exceed the minimum required fire rating.