Which framing members create a rough floor opening?

The framing members that create a rough floor opening are trimmers, headers, and tail joists. Trimmers, also known as trimmer joists, are the joists that support the opening of a floor, often placed on either side of the opening. Headers serve as the structural support across the top of the opening, transferring loads from above to the trimmers. Tail joists are positioned at the end of the floor joists, supporting the edge of the opening. Together, these components form a sturdy and safe framing structure around the opening, ensuring that it can support weight and maintain the overall integrity of the flooring.

The other options, while related to structural framing, do not specifically pertain to the creation of rough floor openings. Studs, panels, and girders are generally used in wall construction and overall structural framing. Beams, posts, and joists are more related to the load-bearing elements of floors and ceilings without directly addressing openings. Sills, blocks, and braces pertain to stabilization and support in other areas of a structure, but not specifically for forming rough openings in floors.