ICC Commercial Building Inspector Practice Test

What is the flame spread index range for Class C interior wall and ceiling finishes?

1. 0-25

2. 26-75

3. 76-200

4. 201-500

The correct answer is: 76-200

The flame spread index for Class C interior wall and ceiling finishes is indeed in the range of 76-200. This classification is part of the broader system used to evaluate the fire performance of building materials, which includes testing how fast flames spread across surfaces. Class C finishes are considered to have a moderate flame spread potential, making them suitable for certain applications where the fire risk is present but not overly severe. Buildings may utilize Class C finishes in areas where increased fire resistance is not as critical as in areas that utilize Class A or Class B finishes, which respectively have lower flame spread indices. Understanding the flame spread index helps inspectors and builders ensure that the materials chosen for construction meet the necessary fire safety standards, and it is crucial in creating safe environments within commercial buildings.