[belgianbeerlover]

I used to have a similar sized punching bag. I installed it in 2 different apts. with no problems. I simply took a good sized (3/8" should be plenty) eye hook and screwed it through the sheetrock into the ceiling joist. The ceiling joist is 1-1/2" thick, so you must make sure it is centered. Find the outside edges of the ceiling joists using finish nails. If the finish nail drives very easy, your at the edge. The finish nail holes are easily patched as is the eye bolt hole.