I want to hang something and I want to make sure it doesn’t fall
Ceiling – How much Weight can a drywall ceiling hold
ceiling
Related Solutions
Ideally this should be screwed/anchored into a joist for maximum support. However, if you really want to use a drywall anchor, you should use a toggle bolt or a ceiling anchor. Instead of just screwing into the wall, these expand to several times their size which gives you a good hold, especially when the force is pulling directly down. 10lbs might be pushing it though, it will depend on the thickness of your drywall and the overall condition. The worst case is you just have to patch the hole and repaint; drywall is pretty forgiving like that!
Just because you can't see the joists doesn't mean you cannot use your beam approach for exposed rafters. The structure is essentially the same, except for a thin layer of sheetrock between the two, which has little impact on the forces involved. The best thing to do is distribute any concentrated load over multiple connections. Use a flat 2x4, or better yet 2x6 that's long enough to span 4 joists, about 4 to 6 feet. Place the chair connection at the center using a large through eye bolt, using an over sized washer to spread the load into the wood. The nut and bolt end will end up punching into the ceiling, but that's OK. Holes are easy to patch if the beam is ever removed, otherwise, it doesn't show anyway.
Attach the 2x beam to each joist with two 1/4" dia. lag screws. Use a screw long enough to penetrate 2 inches into the joist material, probably 4 inches. Drill a 5/32 inch pilot hole before placing each lag to prevent splitting the joist. The resulting 8 screws is more than adequate to support any adult and will not significantly weaken the joists.
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Best Answer
It is recommended to not hang anything just from the ceiling drywall by itself. Particularly anything you have concern that it could fall due to its weight or safety of people or things under the hanging object.
Instead you need to locate the structure that holds the drywall in place and screw the hooks / brackets / retainers into that structure. The type of things you screw in would be dependent upon whether the ceiling structure was wood, metal rails or concrete. But since we have no guidance from you yet as to what type of structure you have suggestions are limited.