If a two-floor building has a width of 36 feet and a span of 4-10, what is the size of the jack stud?

The correct choice for the size of the jack stud in this scenario is 3-2 x 10.

In construction, jack studs are used to support headers or beams above doorways and windows. The dimensions of these studs need to provide adequate support for the load above, particularly in a two-story building where additional weight may be present.

Given the width of the building (36 feet) and the span (4 feet 10 inches), the jack stud must effectively carry the weight of the structure above while accommodating the width of the header that it supports.

The designation of "3-2 x 10" signifies that the jack stud is effectively comprised of two 2-inch by 10-inch boards laminated together, which increases its strength and load-bearing capacity. This configuration is advantageous, particularly in scenarios where increased support is necessary, such as with wider openings in a two-story structure.

Selecting the appropriate size of jack studs is critical for maintaining structural integrity and ensuring safety, especially in multi-story buildings. The other options do not meet the structural requirements as effectively as the 3-2 x 10.