Which form of construction utilizes a top and bottom plate that acts as a firestop?

Platform frame construction is characterized by its use of horizontal framing members, known as top and bottom plates, that are integral to the structure's overall integrity. These plates serve not only as structural components that support the vertical studs but also play a critical role in fire prevention.

In platform frame construction, when a wall is erected, the bottom plate is anchored to the floor, while the top plate connects to the ceiling or the framing above. This design effectively creates a partition that can slow the spread of fire between levels of a building. The continuous horizontal members act as firestops by limiting the vertical movement of flames and smoke through the wall cavities.

Understanding the function of these plates as firestops is essential for fire inspectors, as it directly impacts building safety and compliance with fire codes. This framework not only provides structural support but also enhances the safety features of the building by helping to compartmentalize fires, thereby providing additional escape time for occupants and aiding in firefighting efforts.

The other options, such as rafters, party walls, and projected windows, do not fulfill the same role of acting as firestops within the framework of platform frame construction. Rafters are primarily designed to support the roof, while party walls are structural walls that