To what does a floor joist typically attach?

A floor joist typically attaches to the sub-floor, which serves as the base layer for the flooring in a building. The sub-floor provides structural support and is crucial for distributing the weight of the flooring material and any furniture or occupants above it. By connecting to the sub-floor, the floor joist helps to create a sturdy, level surface that is essential for the overall stability and integrity of the structure.

In construction, floor joists are horizontal members that span between walls or beams, and they are fundamental components in both residential and commercial buildings. Their primary function is to support the sub-floor, which can then be finished with various flooring materials such as hardwood, tile, or carpet. Thus, the connection of floor joists to the sub-floor is a fundamental aspect of framing that facilitates the proper function of a building's floor system.