A horizontal structural member used in framing a ceiling defines the space above a room. These elements, typically made of wood or engineered lumber, span the distance between walls or supporting beams, providing a base to which the ceiling material is attached. For example, gypsum board is commonly affixed to these members to create a finished interior surface.
The structural integrity of the roof and the stability of the building envelope rely on these components. They resist gravity loads from the ceiling below, and in many cases, resist uplift forces from wind or snow above. Historically, these elements were fashioned from solid timber, but modern construction practices also incorporate engineered alternatives that offer increased strength and span capabilities. Correct installation according to building codes helps ensure long-term structural performance.
