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Answer by Jon Raynor for What can I do about this gap between the sill/exterior board and the subfloor?

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There should be no gap. Looks like shoddy construction.

See figure 16 from this page for proper alignment:

enter image description here

Also I have never seen a "band" or "rim" joist that are configured in the fashion described by your image. It can't be good that half of the wall is resting out in space.

You could rip a board to fit the gap so that the weight of the wall is transferred to the foundation evenly, but I would probably call a professional to see if that option is even structurally sound. I would not fill it with spray foam. Fix the structure first, then insulate.


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