Two 2x12 headers can span a maximum of how many feet?

Two 2x12 headers can span a maximum of how many feet?

• A. 7 feet 9 inches
• B. 8 feet 1 inches
• C. 9 feet 9 inches
• D. 8 feet 6 inches

Answer: (A)

The main idea here is how far a built-up header can span before it needs to be larger. A header made from two 2x12s is a deep, stiff member, and depth is the key factor in resisting bending under load. For typical residential loads (roof plus one floor above), a double 2x12 header is commonly rated to span about 7 feet 9 inches. That limit comes from standard header span tables used in practice, which balance strength with practical construction. If you tried to span longer than about 7'9" with that two-2x12 header, you’d usually need a larger header (for example, three 2x12s or an engineered beam) or additional support. The other options exceed what a standard double 2x12 header is generally designed to carry under ordinary conditions, which is why they’re not chosen.

The main idea here is how far a built-up header can span before it needs to be larger. A header made from two 2x12s is a deep, stiff member, and depth is the key factor in resisting bending under load. For typical residential loads (roof plus one floor above), a double 2x12 header is commonly rated to span about 7 feet 9 inches. That limit comes from standard header span tables used in practice, which balance strength with practical construction.

If you tried to span longer than about 7'9" with that two-2x12 header, you’d usually need a larger header (for example, three 2x12s or an engineered beam) or additional support. The other options exceed what a standard double 2x12 header is generally designed to carry under ordinary conditions, which is why they’re not chosen.