The interior trim of plastic must not constitute more than what percentage of the specific wall or ceiling areas to which it is attached?

The correct percentage for the interior trim of plastic to not exceed when attached to specific wall or ceiling areas is 10%. This requirement is in place to mitigate safety risks associated with the fire performance of materials in a building. Excessive use of combustible materials, like plastic trim, can contribute to fire spread, smoke production, and potential structural failure during a fire event.

By limiting the percentage to 10%, building codes ensure that the overall fire load is minimized, maintaining a safer environment for occupants and allowing for more effective firefighting measures if necessary. This standard encourages the use of non-combustible or less combustible materials in critical areas of the building to help control fire risks.

Understanding these fire safety regulations is crucial for a commercial building inspector to promote the safety and integrity of structures.