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I'm putting in an 11' wide door opening in a walkout basement exterior wall. There are 2 more floors above the basement. I have the engineered sized steel beam as the header.

Can I do a 2x6 temp wall, studs directly under each floor joist, about 2' in from the existing exterior wall to be on top of, and parallel to the basement floor joist below.

The floor joists in the basement floor that will support the temp wall run parallel to the exterior wall and are steel 2x6's. See pics below. If they were perpendicular I wouldn't think too much of it.

Below the floor is a dirt crawl space, so not too easy to support under the basement floor.

Thinking I could distribute the load across more of the floor joists if I put several 4x4's perpendicular to the basement floor joists to span 4 of them, then build the temp wall on top of that?

Any other ideas, thoughts?

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    It sounds good, but with two floors above, why did you not have the engineer advise on the support wall when designing the header needed. I doubt that any engineer without seeing the house will give advice over the internet. You did use an engineer?
    – crip659
    Commented Jul 22, 2023 at 20:10
  • Ditto Crip's comments. This screams for an engineer to be involved.
    – RMDman
    Commented Jul 22, 2023 at 20:35
  • @crip659 yeah I can ask the engineer that sized the steel header beam.
    – crichavin
    Commented Jul 22, 2023 at 20:38
  • For the prices houses go for, you really do not want someone on the internet designing this. But then I am surprised by people who try the stuff on tictok.
    – crip659
    Commented Jul 22, 2023 at 20:49
  • I certainly wouldn't take 1/2 the load of the floors above and transfer it to a single one of the crawl space 3" tall? metal joists. If you are going 2' out I'd pick the point and make a pony wall in the crawl that takes the load to the slab. Commented Jul 23, 2023 at 21:21

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