Thank you for the info and the words of encouragement. Yes, I would still prefer to have it hanging than have it on floor. It allows me to put on or take it off to store it away when not in use. And of course, could also be used for other (kinky) applications, which is a bonus. ;-)

With that said, I'll see if I can find an engineer for such small job to reassure everything is ok.

Thanks again.

Thanks!

Got it. Thanks for your thoughts on this.

Based on the comments in this thread and after confirming the type of roof I have, I gave up going ahead with this idea. It might be able to support it ok but I do not want to find out.

By the way, the plan was to hang a Hammock Chair like this which would not be bearing the load 24x7.

Thank you very much for all your insights and detailed response. I really appreciate it.

Based on the comments in this thread and after confirming the type of roof I have, I gave up going ahead with this idea. It might be able to support it ok but I do not want to find out.

Someone suggested to transfer the load to the floor. One option I could see would be to support the 4x4/2x4 on two opposite walls in the room. I know the walls use metal studs and I assume it would need to lay on top of stud post that goes to the floor, not between studs. Anyway, I am giving up this idea for now.

By the way, the plan was to hang a Hammock Chair like this which would not be bearing the load 24x7. I also liked the "romantic/intimate" swing idea.... LOL.

Got it. So let's say you are right and it's not joists it's the bottom chord of the engineered roof trusses. Would that mean you can't put any load on it? I am genuinely asking because I know people walk on top of it in attics. If someone were to hang from the bottom of it (across more than one), wouldn't it be the same?

That metal is just the framing from the underneath drywall work. Not structural at all.

I am not sure how long is the span because of all the insulation but based on the portion I was able too see I have an impression it's pretty long.

I will try to take better pictures to see if it helps.

Yes, it's 2x4 joists. It is close to the outside wall and another internal wall but the internal wall is just aluminium framing and I don't think it plays any structure role in it.

I am trying to understand what you proposed. Doing some research. Thanks.

I believe this is the type of roof I have: https://ibb.co/NrBks8n

I know for a fact that the joists where the drywall ceiling is hanging from are 2x4's.

Based on your answer I got the impression that the drawing I did is so bad that it might be giving the wrong impression on where I plan to lay the 4x4/2x4.

My plan is to lay it on top of the joists, not at all connected directly to the roof structure. Once laid down, I would put the insulation on top of it again. It would be flush with the ceiling.

Does it make sense? If not, what "four anchor points on the two trusses" are you referring to?

You might be right and I don't want to be that person that does what wasn't supposed to be done. That's why I am double checking before even starting. :-)

Realistically it would be around 350lb but I am calculating 500lb as a safety margin. Instructions say to hang it to just one joist. I am being more conservative and planning to fix to a 4x4/2x4 over several joists to spread the load.

It is a two story house and this is in the upper floor. I am not sure what type of framing it is but here is a picture of it: https://ibb.co/xGXxs2Q

The red circle is where I plan to add the eye hook from beneath.

The purple markings in this picture is where I was planning to lay the 4x4 or the 2x4. The plan was to have the eye hook hanging from the 4x4/2x4 and not the ceiling trusses. The 4x4/2x4 would lay on top of the joists where the drywall is fixed to. Here is the picture: https://ibb.co/HtN6QvF

Does this make sense? I don't want to do anything that is not safe, that's why I am checking before even starting. Any help is appreciated.

Edit to say:
My plan is to lay the 4x4/2x4 on top of the joists, not at all connected directly to the roof structure (sorry for the bad drawing). Once laid down, I would put the insulation on top of it again. It would be flush with the ceiling just above the joists.