In my dinning room the floors near the walls are nice and firm but towards the center of the house sink in a little and have some give. The wall show in this photo, however, does not have any support directly beneath it. There is a load bearing beam a feet away.
As a result, over the years the joists have taken a beating and previous owners have sistered the joists to prevent further damage. It seems that this has been an OK fix but the joists they put in didn't span the whole way.
I would also like to frame in some of my basement so that the furnace doesn't draw in as much cold air and so the basement is a little more temperate.
As I think about adding more support, load bearing beams or walls, I am trying to think about where I can add them without having to add more concrete footing. I don't really know what areas of my basement have reinforced footing. Any help on this? The area in most need is the first 3-4 joists from the door into the unfinished area of the basement.