I'm wanting to mount a pull-up bar that needs 48" OC spacing to the exterior basement wall. However, it has drywall attached with broad-side 2x4's (rather than on edge), which is attached to cinderblock. I could very well be wrong, but it is my understanding that 2x4's attached broad-side like that don't have the same holding/hanging strength vs. when attached on edge. In addition, I'm very uncertain about attaching into cinderblock, mainly because I have never done it before and have no frame of reference -- intuitively it seems like it would be more brittle potentially? My plan was to use 3/8" x 3" Tapcon concrete bolts, pre-drilled with a 5/16" concrete drill bit. Before I start drilling unnecessarily, I wanted to make sure what I'm doing would be safe for anyone hanging on it and/or the cinderblock and my wall.
Each side of the pull-up bar attaches with 4 bolts, for a total of 8 bolts on both sides. I appreciate any help or suggestions!