I'm trying to mount a pull up bar to the studs behind my drywall. The studs are 16" apart, but seem to be of different widths. Specifically, I see a 3.5" stud, 3.5", 2", 2", 3.5". Are these just 2x4s in different orientations? Is there a preference for which I should mount on?
The 3.5" studs are either doubled-up 2x4s, or a sideways 2x4. I would use the 2" studs to mount it on because if the 3.5" studs are sideways, they will be more likely to bow out under load, and a regular 2x4 is more than strong enough to hold body weight.