If I did this I imagine I would first drill the holes for the bolts, then glue fibreglass sheeting over the whole area, and then pierce the sheet just over the holes in order to place the bolts. My question is: would adhering fibreglass sheets to the ceiling where I place the bolts help to improve the ceiling's tensile strength and reduce the chance of the concrete cracking/failing? Originally I planned to use two expanding bolts and an epoxy to help secure them but now I'm not sure. I've read similar questions and responses here and the the issue seems to be tensile strength of the concrete. My ceiling is also my neighbour's floor, the building is from 1958. The slab is 180mm (7inches) thick and the (static) weight which I would need to support would be 70-90kg (155-200lb). I'm investigating the possibility of hanging a pull-up bar/ rock-climbing training board from the concrete ceiling in my apartment.
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