I am in the process of replacing the subfloor, a few joists, sill plate and header board. With the help of this community I have either worked out a plan or completed most of the parts of this task. From what I have read, to replace the subfloor under my load bearing walls, I need to brace it, pull the footer and hammer it back in when the floor is in. What is the best way to brace this wall so I can get a full 4×8 sheet of plywood under it?
Edit
I added a pic of the rafters in the attic, the row before the vent is sitting directly on that wall. Pic with the purple board is of the top of wall, there is another 2×4 hidden by ceiling. Obviously pic of bottom is just that.
Best Answer
If that wall is not a load bearing wall, and from your pictures it sure does not look like it, you could consider just dismantling it temporarily. Then just pull up the bottom plate. This would leave you fully open to replace the sub-flooring after which you can just rebuild that short piece of wall. It is only 5 studs and less and about two additional sheets of new drywall.
From your other pictures it certainly appears that you have quite a bit of rebuilding work to do already so re-doing that wall would not be too much additional.