On 13/06/2020 13:57, Clive Arthur wrote:
On 13/06/2020 11:44, Lee Nowell wrote:
Hi All,

My daughter is getting a hanging chair for her bedroom.Â* It is
essentially made of ropes which end with a single loop at the top to
hang it from.Â* There are no other fittings with it so wondered what
the best way to hang it from the ceiling is?

Assuming I can screw it into a joist where she wants it I have the
following questions
1. What fitting to use?Â* Having had a look in Screwfix was wondering
if something like these would work
https://www.screwfix.com/p/magnodur-...5-x-15mm/527jf
https://www.screwfix.com/p/easyfix-z...-10-pack/15851


or anything better?
2. If I end up with a plate type thing (such as the first link),
assume I will need to cut the plasterboard to ensure it is on the
joist itself to avoid the ceiling cracking?

If I can't get to the joist now what are my options? 3/4" ply screwed
between 2 joists (either on ceiling or between the joists) and then
what fitting?Â* Assume I will need a much broader plate type thing with
several screws to distribute the load?

Sense this is all fraught with danger and the fitting is many times
more complicating than buying the thing in the first place

thanks

Lee.

My view is that joists are not designed to take point loads this way,
the floorboards normally spread the load.Â* Maybe that's over-cautious.

The peak load on a point source compared with one spread over a whole
beam is IIRC 2:1 bending moment

Atypical chair with 4 legs is spread over only a couple of beams max,
The floorboards don't really spread that much load further than that



Is there a loft above which you can get to?Â* If so, some 3/4 ply used
atop some joists to spread the load is the way I'd go.

won't spread a damned thing really.
Far better to e.g. double up the joist the chair hangs from





--
€œIt is hard to imagine a more stupid decision or more dangerous way of
making decisions than by putting those decisions in the hands of people
who pay no price for being wrong.€�

Thomas Sowell