Walls – remove these walls

demolitionengineeringload-bearingwalls

I'm doing kitchen renovation and want to remove a few walls. Those are on the first floor of a 2 story house(no basement).
I've opened a few of them and did my best to provide all the pictures.
I opened the ceiling and checked how joists run above those walls. Looks like they just run through them a few feet past the walls I'm considering to remove.

1&2 is a small closet. 3&4 is has only 1 wire inside which is going into the slab.
the niche between those walls was supposed to be a built in desk

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  1. Can I remove them (Wall 1,2,3,4) and make the back wall flush?
  2. Should I reinforce those joists? For example I can do sistering with a plywood from both sides of them.

Edit:

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Wall 1/2 Intersection with trusses:

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Best Answer

1 and 2 don't seem structural, because they don't go under the strong points of the truss-joists.

3 and 4 are hard to tell, you're asking me "Is this wall holding something up" I can't see from here.

I would guess probably not structual, but they don't seem to serve any other purpose.

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