A floor opening near the center of a wood-framed span measuring 3'8" by 4' requires which framing?

A floor opening near the center of a wood-framed span measuring 3'8" by 4' requires which framing?

• A. Single header and double trimmer
• B. Double header and single trimmer
• C. No header needed
• D. Two headers

Answer: (A)

When a floor opening interrupts a line of joists, you must bridge that gap with a header so the joists’ loads aren’t lost into the opening, and you need trimmer (jack) studs to carry that header down to the bearing. For a mid-span opening about 3'8" wide, a single header across the opening with a trimmer on each side is sufficient to transfer the loads from the cut joists to the supporting walls. This setup provides the needed support without unnecessary complexity—two headers would be overkill for this size, and no header would leave the joists unsupported. So, one header spanning the opening, supported by a pair of trimmer studs on either side, is the correct framing approach for this case.

When a floor opening interrupts a line of joists, you must bridge that gap with a header so the joists’ loads aren’t lost into the opening, and you need trimmer (jack) studs to carry that header down to the bearing. For a mid-span opening about 3'8" wide, a single header across the opening with a trimmer on each side is sufficient to transfer the loads from the cut joists to the supporting walls. This setup provides the needed support without unnecessary complexity—two headers would be overkill for this size, and no header would leave the joists unsupported. So, one header spanning the opening, supported by a pair of trimmer studs on either side, is the correct framing approach for this case.