I have a 40lb punching bag that I want to hang for kids but I want to do this in a way that I can upsize the bag as needed. My basement is finished, and I'm ok with cutting out some ceiling drywall to do this but I'm wondering if it's OK to do it without removing drywall.
What I was thinking was a [2/4]x[4/6] would be bolted to 2 floor joists through the drywall. I would countersink the top so I can put the bolt through without needing to push into drywall above.
Am I better off just cutting out the drywall or is this sufficient? Are there modifications I can make to improve this?
If I were to cut out the drywall my plan would be to put a 4x4 between the joists and then another 2x4 bolted to that from underneath, so that it was flush with joists. (please correct me if that's no good either).
In the image, the dark blue are floor joists, brown is a [2/4]x[4/6], light blue are additional 2x4's that I'm not sure are needed.