What does the sole plate of a floor frame rest on?

The sole plate of a floor frame functions as the bottom horizontal member that provides support and stability for the structure above. It typically rests directly on a concrete foundation. This foundation serves as a solid base that helps distribute the load of the building, preventing shifting and settling over time. The concrete foundation is designed to withstand the compressive loads of the building and helps protect against moisture intrusion, which is crucial for maintaining the integrity of the wooden components above.

In contrast, while wooden beams and foundation walls may play roles in the overall stability of a building, they are not where the sole plate is directly positioned. Floor joists are also horizontal members within the framing that help support the flooring above but do not serve as the base for the sole plate. The specific placement of the sole plate on a concrete foundation provides a durable and stable foundation for the floor framing above.