I'm putting in a "hanging chair" in the basement and it's supposed to hang from a single hook in the ceiling. The ceiling is reinforced concrete.
Now, I'm about 125 kilograms (275 lbs) so I reckon the hook should easily be able to bear twice that for safety. Is that a good enough margin?
What would be the easiest and best way to mount a hook in the ceiling that will hold about 250 kgs (550 lbs)?