[john70t]

tcar, It's a 17' span on both runs. Interior walls are mostly parallel.

I cancelled the friday delivery of heavy 3/4" and am going to get a structural engineer. (aka call the guy)
I'm personally sort of 'leaning' towards using 1/2" and beefing up every other joist per advice here.

The stairs are narrow so there would be little storage use up there. I'm sure it was a summer sublet for some kids back in the day.

At this point there are probably a few other factors involved in the house which need beefing up.
It's a cobbled web, everywhere, the more it's thought about.
What I could only do is probably fix part of it, but that would affect somewhere else. Then there would be shifting and popping and repainting for years.

Can 'o worms situation.
There is a balance between doing what is right, and doing what is possible, and doing what is affordable.


Thank you all again for the advice.