What materials are typically used for fire stopping?

Fire stopping materials are specifically designed to prevent the spread of flames, smoke, and gases from one compartment of a building to another during a fire. The correct choice highlights materials that possess these necessary fire-resistant properties. Mineral wool, for instance, is known for its high melting point and excellent insulation properties, making it effective in sealing gaps and spaces around fire-rated walls. Cementitious materials are often used to create fire barriers and can withstand high temperatures without deteriorating. Fire-resistant sealants are essential in filling joints and penetrations through fire-rated assemblies, thus maintaining the integrity of fire separations.

In contrast, the other options include materials that either do not provide effective fire resistance or are not typically used for this purpose. Wood and plastic, for example, can combust easily, making them unsuitable for fire stopping. Plywood and drywall may provide some degree of fire resistance, but they do not function as effective firestopping materials on their own. Glass and aluminum, while they may have specific applications in fire-rated assemblies, do not fulfill the role of fire stopping materials as effectively as the selected choice. Understanding the proper materials for fire stopping is crucial for maintaining building safety and complying with fire codes.