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Old 12-20-2012, 01:00 PM   #1
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Need help with zip line


Purchased 90 foot zip line for my son. Do not have trees to attach. Was planning on buying 4x4x12 post from lowes and putting 4 foot in ground and having 8 foot above. Called manufactor of zip line and they said I need at least 12" diameter to attach to. Their experience is that 4x4 and 4x6 post will bend over time. My question is, if I attache 2 posts together, and then bury it in concrete, will that double the strength and keep the posts from bending...thanks

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Old 12-20-2012, 01:49 PM   #2
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Need help with zip line


No. And please check with your insurance company before proceeding. They may drop your coverage if you install a zip line on your property. That was quite common years ago when trampolines were all the rage.

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Old 12-20-2012, 09:12 PM   #3
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Need help with zip line


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Originally Posted by Jack121883 View Post
Purchased 90 foot zip line for my son. Do not have trees to attach. Was planning on buying 4x4x12 post from lowes and putting 4 foot in ground and having 8 foot above. Called manufactor of zip line and they said I need at least 12" diameter to attach to. Their experience is that 4x4 and 4x6 post will bend over time. My question is, if I attache 2 posts together, and then bury it in concrete, will that double the strength and keep the posts from bending...thanks
If I am reading your post correctly, are you suggesting to go against your manufacturer's instruction/recommendation?

Sorry, I can't help you much more...

Just be careful...
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Old 12-20-2012, 11:16 PM   #4
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Need help with zip line


4X4 is way too small, and using two of them is still not even close. If you want to build a suitable endpoint for the zip line using lumber (rather than heavy timber or a live tree) you will need to build some kind of frame. Three anchor points would be the minimum, I think, since you need rigidity in two directions. Planting a section of utility pole would probably be easier and cheaper, even if you contract a drilling company to make the hole.
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Old 12-20-2012, 11:19 PM   #5
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Need help with zip line


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Originally Posted by mpoulton
4X4 is way too small, and using two of them is still not even close. If you want to build a suitable endpoint for the zip line using lumber (rather than heavy timber or a live tree) you will need to build some kind of frame. Three anchor points would be the minimum, I think, since you need rigidity in two directions. Planting a section of utility pole would probably be easier and cheaper, even if you contract a drilling company to make the hole.
Exactly, I was just going to suggest a utility pole, should be plenty beefy enough
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Old 12-21-2012, 01:41 PM   #6
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Need help with zip line


I suggest you return the zip line and buy your son a bicycle instead. Or an electric train. Even if your insurance company doesn't cancel you, your premium will surely go up just because of the liability.
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Old 12-21-2012, 03:06 PM   #7
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Need help with zip line


I say go for it and let natural selection run its course. Do you have any big pieces of fireworks you or your son can carry while zipping down the line?

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Old 12-23-2012, 04:58 AM   #8
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Need help with zip line


count me in as a supporter of natural selection, too,,, got to happen sometime,,, otherwise he'd know 4 x 4's are akin to matchsticks - unless he's an atty, of course no motorcycle helmets, either,,, show me where the world is a better place because of gary busey

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