I would like to mount a hammock chair like the one below to the roof of my balcony. Or rather put a rope around a wooden bar (see the next photo) just like I were mounting it on a tree branch. However, I am not sure the wooden bar and its mounting points can stand the weight of me in the hammock (around 80kg). I've tried to do some pull ups and the bar seems stable enough, but I'm not sure if it would stand longer stresses and movements of the hammount chair.
What could I do to make sure?
Mounting of ceiling member to a root rafter:
Best Answer
The horizontal board (rafter tie) and roof boards (rafters) are sized large enough for your purpose. The connection between the two is also adequate.
I don't think it necessary but if you were to want to increase the strength then I would start by adding (2) #8 x 3" screws to the connection from the rafter tie to the roof rafter. For more, I would suggest sharing the load with more rafter ties by placing a 2x4 or 4x4 over the top of (2) rafter ties (if you want to hang the chair between rafter ties) or over (3) rafter ties (to hang directly from a rafter tie as you plan). This can be attached with #8 screws (they are not structural, they just keep the board from moving)