What is a device installed in a ceiling membrane of a fire-resistance-rated assembly to limit radiative heat transfer?

A device installed in a ceiling membrane of a fire-resistance-rated assembly to limit radiative heat transfer is essential in maintaining the integrity of fire-rated constructions. This device can include various forms of insulation or other protective materials that help to contain heat and flames during a fire event, thus preventing them from spreading to adjacent areas or floors.

Both floor/ceiling and roof/ceiling assemblies can be equipped with these devices since they serve the same fundamental purpose of improving fire resistance by limiting heat transfer through the ceiling. In fire-resistance-rated assemblies, the goal is to provide improved performance under fire conditions, and these forms of assemblies can be subject to the same principles of thermal protection.

By recognizing that both types of assemblies (floor/ceiling and roof/ceiling) can include mechanisms for limiting heat transfer, it becomes clear why either choice A or choice B would be appropriate. This understanding underlines the importance of evaluating the specific construction types and their fire-resistance features in building inspections.