When penetrating a concrete fire-resistive wall with RMC, is it acceptable to use mortar to fill the annular space?

Using mortar to fill the annular space when penetrating a concrete fire-resistive wall with rigid metal conduit (RMC) is not acceptable because it does not meet the requirements set forth in the building codes and standards regarding fire-resistance. Mortar does not provide the necessary fire-stopping characteristics needed to maintain the integrity of the fire-resistive wall.

Proper methods usually involve the use of fire-stopping materials specifically designed to prevent the passage of smoke, flames, and heat through penetrations in fire-rated walls. These materials often include silicone sealants, intumescent sealants, or firestop putty that can expand and seal the space in case of a fire.

Some alternative options for filling the annular space are evaluated based on their fire-resistance ratings and compliance with local building codes, which is why selecting appropriate materials is crucial when making penetrations in fire-resistive walls.