In occupancies where a Class A or Class B interior finish is required, which of the following is the allowable amount of Class C materials?

In occupancies where a Class A or Class B interior finish is required, which of the following is the allowable amount of Class C materials?
A . 5 percent
B . 10 percent
C . 15 percent
D . 20 percent

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Answer: B

Explanation:

The use of interior finish materials is regulated by NFPA 101®, Life Safety Code®, Section 10.2.3. In occupancies where Class A or Class B interior finishes are required:

A limited percentage of Class C materials may be allowed as incidental decoration or finish, provided it does not pose significant fire risk.

The allowable amount of Class C materials is limited to 10 percent of the total wall and ceiling area within the space.

This restriction ensures that the overall fire performance of the interior finish remains within acceptable safety limits.

5 percent (A): Too restrictive compared to NFPA allowances.

15 percent (C) and 20 percent (D): Exceed the permissible amount under Class A or B requirements.

Reference: NFPA 101, Section 10.2.3: Interior finish requirements and allowable material classifications