John Rumm wrote:
Peter Purr wrote:

I need to hang something from a single point on a ceiling. The load
will be about 300Kg max, after allowing a suitable safety factor
(actual load closer to 100Kg).

You are talking about a 1 to 3kN imposed point load which is quite a bit
- especially as you have no control over what load will be placed on top
of the ceiling (i.e. in the flat above).

Any ideas or caveats?

I expect it owuld be simpler to make up a steel frame/gantry that would
rest on your floor and carry the load.

I'm keeping that in mind as a last resort, but without some pretty
creative design it could look hideous which SWMBO wouldn't wear & in any
case she's the one who wanted the fecking thing - I just get to make it
happen.

I meant to look for a joist tonight in an out of the way location
(probably a cupboard), make a hole in the ceiling there & have a prod
about, as I'm not sure how much variation there is in possible
structure, but the battery's flat in my stud detector, so that'll have
to wait until tomorrow.

To make any stab at an answer we would need to know the joist width and
depth, the span, and where along the span you wanted the load fitted.

That's what I expected. I'll try to get this info tomorrow if I have
time & get to prod about.

For example, close to a supporting wall at the end of a joist may be
doable. The middle of a room is unlikely to be easy.

Understood. No figures yet, but it wouldn't be at an end - probably four
to six feet away. Also, one of the walls is internal - it has the boiler
behind it - not that I know if that's likely to correlate with a
supporting wall or not; I'll have to check that out too. Thanks for the
comments.

--
Peter Purr