Rolling the joists

All the joists are hung, it's surprising how impossible they are to walk across like this because of how it resonates since there is no ceiling attached to the bottom and nothing on top.

This is how I did around the toilet, I left more space than I needed to so it's easy to work in if I need to, plus it shouldn't be hard to add some blocking for support if its needed.

I talked to my civil engineer friend, and he said I should add a cross-joist under where the one bedroom wall is, since it might end up being load bearing when there is a lot of snow on the roof.  To do this, I'm running a 2x8 perpendicular to the joists, with each notched out so they fit together, and then using brackets to tie it all together.  Here's the markings for the notches

While I was cutting the notches, I ended up cutting through one of the nails in the double 2x8, so that's cool looking

After seeing the state of the subfloor in the bathroom from all the water, I decided I want to be able to replace it down the road easily.  So instead of putting the bottom plate for the wall on top of the sub floor like normal, I'm putting it directly on the joists.  I decided to put it in now so can more easily walk across the joists (it was surprising how much it helped).  This picture also shows the notching.

I notched the perpendicular 2x8 as well, here's what it looked like

 
Then tried to put it in, but the wood split on the end

Since I had the extra wood I decided to give it another shot, and loosen up some of the notches in the joists so I wouldn't need to hammer so much.  And it happened again, so at this point I was done for the night.