Would a 4x4x10 beam with a 4x4 joist handle a bench swing/hammock chair? It's already anchored to the ground with 2ft of cement.

  • 3
    How are the two pieces connected and supported and how and where is the chair attached? What is anchored to the ground? A diagram would help.
    – jay613
    Commented Jun 11 at 13:25
  • 1
    A beam and a joist? Your description is confusing. You also didn't mention span, which is critical. Please revise to be more clear, and take the tour.
    – isherwood
    Commented Jun 11 at 14:31

1 Answer 1


Handle? Yes. Handle well? No. Too much flexing.

I had tried to re-use a 4x4 for an A-frame swing and ended up replacing the top beam with a 4x6 (with the 6" being vertical); 4x4 legs were fine. Even with light loads (children), it flexed too much. I didn't think it would break, but the flexing kind of ruined the experience.

  • Is there a way for me to strengthen it without changing the 4x4 post? Strengthen with another 4x4?
    – Jon
    Commented Jun 11 at 0:48
  • Or a 2x4 as a brace with a screw on 4 points of the post?
    – Jon
    Commented Jun 11 at 1:31
  • The A-frame swing I built for my kids has a 4x6 top beam, and it still flexes a lot! But a bench swing does not attach to the center of the beam, but closer to the ends, so I image it would flex less.
    – Cheery
    Commented Jun 11 at 14:57
  • It's probably not the posts, @Jon, that are the problem. It's the 4x4 as your top beam. That's the one that should be a 4x6
    – FreeMan
    Commented 8 hours ago

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