Class C interior wall and ceiling finishes are classified by a flame spread rating of what range?

Class C interior wall and ceiling finishes are categorized with a flame spread rating that falls within the range of 76 to 200. This classification is vital for understanding fire safety and building code compliance, as the flame spread rating is an indicator of how quickly flames can spread on a surface.

Finishes that fall into Class C do not provide as much protection as those in Class A or B, which have lower flame spread ratings. For example, Class A finishes have a flame spread rating of 0-25, while Class B finds its range at 26-75. The higher the flame spread rating, the more vulnerable those surfaces are in the event of a fire, making it crucial for inspectors to identify and assess the appropriate classifications to enforce safety standards in commercial buildings.