I built a simple swing set for my toddler daughter. I just want to make sure that the beam can hold up for the two swings. I have two 6x6x12 post set 3 ft deep at 23 inch apart for a slide. Than I ran a 6x4x12 beam across the top of the two post. On each side of the post I have a swing. I will be adding sport 4x4 post connecting the 6x6 to the 6x4 on each side (drawn in red). Any support would be great. Used #2 pressure treated wood.

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  • Please fix your sideways image. That's rather jarring to your readers.
    – isherwood
    Commented Jun 2, 2021 at 16:50
  • It looks like your beam is flat (oriented horizontally). Is that correct? Also, I don't understand your statement about adding support. Please revise to clarify.
    – isherwood
    Commented Jun 2, 2021 at 16:51
  • 4
    Experience tells me this is likely to work for a toddler, for a while, until larger children (cousins, etc) come to play. Stabilizing with an A-frame on the end of the beam is a must, sooner or later. Commented Jun 2, 2021 at 17:03
  • 1
    Cross-brace the two poles to provide rigidity from skewing from side to side. Also use the slide to provide front-to-back bracing by planting a post in concrete under the bottom end of the slide and screwing the front lip of the slide to it. If the slide isn't strong enough to provide bracing, run a diagonal beam directly underneath it, from the existing verticals to a new post in a concrete bed under the front lip of the slide. If you do all that, and you stick with the plastic swings and nylon ropes, your structure won't be the weak point.
    – jay613
    Commented Jun 2, 2021 at 17:36
  • 1
    With time, the free end tends to deflect downward which renders the swing uncomfortable or unsafe. Also, you need to make sure the posts are buried deep enough to resist the force caused by the swing. Travis has a good point.
    – r13
    Commented Jun 2, 2021 at 17:41


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