What is the finish rating in fire investigations?

The finish rating in fire investigations refers to the time determined for specific temperature rises in protected assemblies. This rating is crucial for understanding how different materials and assemblies react under fire conditions. By assessing the finish rating, investigators can determine the fire resistance of materials, which is vital for evaluating how a fire spread, the potential for flashover, and the overall dynamics of the fire scene.

In many investigations, understanding the temperature rise and how long an assembly can withstand heat before failing contributes to a clearer picture of the fire's progression and the effectiveness of fire prevention measures. This information is often gathered through specific tests and standards that identify how long materials can endure fire exposure before reaching critical failure points. Hence, B accurately reflects the definition and significance of finish rating within the context of fire investigations.