What is required for the trimmers and headers of the lumber surrounding an opening for an attic drop down stair that measures 5 x 4-6?

The requirement for headers and trimmers surrounding an opening for an attic drop down stair measuring 5 x 4-6 stipulates that both must be doubled. This is essential to provide adequate structural support, ensuring the opening can accommodate the weight and stress that may be placed on it when the stairs are in use. Doubling the headers and trimmers strengthens the frame, enhances stability, and decreases the risk of sagging or failure over time.

Additionally, since the opening is relatively large compared to standard framing, it is critical that both components are robustly constructed. Properly doubling these elements helps distribute loads more evenly and supports the functional integrity of the ceiling structure around the opening. The other options would not meet the structural requirements or may compromise safety and durability.