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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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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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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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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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mpoulton said:
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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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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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?

B
 

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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 :whistling2: no motorcycle helmets, either,,, show me where the world is a better place because of gary busey :laughing:
 
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