Is this legal? And should we use 2 by 8s?

Question

I posted a couple of days ago about joists not reaching the end of the wall, and it was only a subsection.
We’ve stripped off all floorboards and this is what we see.

Now the question is, these joists measure as 2"x 4"s, Surely the new ones we put in should be 2"x 8", no?
Not sure how they would fit and I’m not sure why they weren’t originally 2"x 8" either. There’s a good meter between the 2 bottom beams.
Is this common?
What should the span between beams be when laying 2"x 4"s or 2"x 8s"?
See full video with joists taken out here:
https://streamable.com/4hb7w1

Alaska Man · Answer

What should the span between beams be when laying 2"x 4"s or 2"x 8s"?

If your question is only what should the floor joist spacing be then; if you go with 2"x 8" floor joist    16 "  on center (OC) will be sufficient.
I would not use 2"x 4"s.
If you use 2"x 6"s then i would go 12" OC.
If your question is how should i rebuild this then; I would rip it all out, Bolt rim joists to the concrete wall with anchor's and run the joist from wall to wall (left to right in the photo) hung on the rim joist with Simpson joist hangers and then re-do the plumbing.

Is this legal? And should we use 2 by 8s?

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