What are two 2x4's nailed together that connect studs to a ceiling referred to as?

The term used to describe two 2x4s that are nailed together to connect the studs to a ceiling is commonly referred to as double top plates. This construction technique provides added strength and stability to the wall framing. The double top plates serve as a supportive horizontal member at the top of the wall, distributing weight and providing a secure anchoring point for the ceiling structure above.

Using double top plates is a common practice in carpentry as it helps to reinforce the connection between the vertical studs and the horizontal elements of the wall assembly. This helps to ensure that the wall is capable of bearing loads, resisting lateral forces, and maintaining overall structural integrity. In many construction methods, this is considered standard practice, especially in residential framing.

Other options such as double bottom plates would refer to the horizontal members at the bottom of the wall assembly, framing braces are used specifically for stabilization purposes, and stud connectors serve a different function, mainly associated with attaching studs to each other or to other framing components. Hence, the context clearly aligns double top plates with the function of connecting studs to the ceiling.