If you're planning to install a new ceiling fan or chandelier that will put some weight on the ceiling, be sure something above the ceiling will support that weight. If a beam is directly above the fixture, all you have to do is mount the fan or chandelier. If no beam exists, and you don't have access from the attic, your best bet is to install a hanger bar.
Instructions
1. Purchase a ceiling fan expandable metal hanger bar. This will provide the support needed, while enabling you to bridge whatever size gap exists between the beams or joists.
2. Remove the existing junction box from the ceiling.
3. Expand the hole in the ceiling with a jig saw, if needed, for the end of the hanger bar to slip through.
4. Slip one end of the hanger bar up through the hole to guide the whole piece through.
5. Expand the hanger bar until it is snugly against both beams.
6. Use a wrench to give the expansion screw a full turn so that the prongs of the hanger bar dig into the beams. These prongs will provide the support for the fixture.
7. Patch the ceiling if your cut for the hanger bar made the hole too large. Continue with fan or chandelier installation.
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