Framing question: ceiling/floor joists
First time poster here. Thanks for all the great information here.
We are trying to remodel our kitchen which involves removing a wall. We have an architect/engineer creating the plan, but there is some question on the joist size.
The wall that is to be removed is currently identified as non load bearing. But once it is removed, the joists will span a lot longer than the maximum allowed for the size. So we would need to replace with larger joists. The current size is 2x8 and after wall removal, they need to span 18ft. The kitchen is on 2nd floor and there is another floor above it.
My question is, if the wall is not load bearing, how can the current joists be resting on that wall at all? The current joists are clearly too small to go across the two rooms. Does that mean the joists are resting on the wall and the wall is in fact load bearing? If that's not the case, what does maximum allowed span mean? Is the wall just preventing sagging and not taking any loads (dead or live)?
Thanks in advance!