There you go, the last stud should always be doubled in any wall.That double stud is my doing, I wanted to remove that last stud, so I doubled up the one next to it just in case to add support. Lol
He has standard stair framing. Are your stairs as steep as they look?I have the same exact situation. The double joist is the load bearing bean - the support beam. I also removed most of that wall - you can see on the picture how far to the left it used to go. To be sure, I suggest simply look at the blueprints. If it is loadbearing then the blueprints will clearly indicate it. View attachment 639667
Measure the run and rise, 40 would be pushing it you would like to be around 37*@Nealtw They are 44 degrees. I never thought of them as very steep, but now since you mentioned it Maybe that's why my dog doesn't go downstairs?
7 3/4 max for rise and we usually cut the tread at 10 and put an 11 inch tread on it.Just measured. RIse 8inches, run 10 inches. I know it's 44 degrees because this is the angle I set on my saw when cutting that slanted piece.
Next time look for a stair calculator on line.I guess it is steep, but I never questioned it since I didn't know any better.