What structural element is typically used for support over wide window openings in framed walls?

The choice of a double 2 x 8 header as the correct answer is based on the need for adequate structural support over wide window openings in framed walls. Headers are crucial in transferring loads from above the window down to the wall studs on either side.

A double header, utilizing two 2 x 8 pieces, provides greater strength and load-bearing capacity compared to a single header, making it more suitable for wider spans. The increased thickness and overall size of the double header allow it to support vertical loads effectively, including the weight of the roof or upper floors, while also ensuring that the wall remains stable.

In contrast, options such as a single 2 x 6 header would likely not provide sufficient support for wider openings due to its reduced depth and structural integrity. Similarly, while a single 2 x 10 header offers additional height, it does not utilize the benefits of a double configuration for enhanced strength across a wider span.

Thus, the double 2 x 8 header strikes an optimal balance between adequate load support and compatibility for typical framing practices in construction, which is why it is considered the correct answer.