The use of interior finish materials is regulated byNFPA 101®, Life Safety Code®, Section 10.2.3. In occupancies whereClass AorClass B interior finishesare required:
A limited percentage ofClass C materialsmay be allowed as incidental decoration or finish, provided it does not pose significant fire risk.
The allowable amount ofClass C materialsis limited to10 percentof 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, , ]
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