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My fiancée has decided she’d like an indoor hanging chair, like this one: https: //www.wayfair. co. uk/garden/pdx/bay-isle-home-vasilla-swing-chair-tiny1253.html
It comes with a welded eye hook that simply screws into the ceiling joist. I’m confident enough to actually install the hook into the joist, but before I do I want to be certain either of us sitting on the chair (although I can’t see me ever using it!) won’t bring the ceiling down!
Our house is a 1920s ex-council house. The joists are 2x4s, spanning 12’. There is 400mm between each joist, and from what I can see from lifting the insulation up, they’re not braced. The loft is above the ceiling, and AFAIK the joists form part of the roof structure. The chair will be hung roughly in the middle of the span.
I think she’s only likely to use it for an hour at a time, probably three or four times a week - until the novelty wears off and we fall out because I’ve wasted my money!
As they are currently, will the joists be strong enough to support this use?
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How can you spread the load? It is less towards the edges of the span and sistering a thick joist or a steel would cost a bomb but even that would have a certain degree of flex. Unfortunately you need a short span and a thick beam.