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Old 08-18-2010, 11:19 AM   #1
Mike K
 
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2x10 Joist working load 14' span


I would like to hang a 600 lb motorcycle in my garage from two 1500lb boat trailer winch's. One winch will be bolted to the 10" steel beam running the width of garage and length of the home. The other winch would have to bolt to the ceiling with 2x10 joists ,16" centers, 14' span, but only 4' away from the 10" steel beam.

My plan is to lag bolt a 6" steel beam under the joists for the winch to bolt to. My question is how many joists do I need to span to carry the 600lb motorcycle safely?

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Last edited by rebar; 08-18-2010 at 11:22 AM.
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Old 08-18-2010, 11:59 AM   #2
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This sounds like a plan of potential dire consequences. That much weight should be on the ground. I put the 700 lb bike in the shed as there's no room in my 2 car garage.
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Old 08-18-2010, 01:27 PM   #3
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That's definatly a lot of dead weight on 2x10"s at 14' heck I would never suppend something that heavy, but that is me... if you where really set on doing it, I'd for safety have a steel I beam with brackets looped around it and welded in place
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Old 08-18-2010, 01:41 PM   #4
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To use the existing beam that is rated for the load already on it and probably not much more would be foolish. I doubt the builder put in an extra strong one as they cost more. Adding a point load to joists that are rated for a distributed load is another problem. To try and figure the withdrawal strength of the lag bolts and the attachment would require a Structural Engineer to accept the liability involved. Have you looked into the lifts available? If for storage, could you build a removable ramp onto a raised platform?

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Old 08-18-2010, 09:48 PM   #5
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I should have added before that this project is intended to replace a bike lift. My knees have had it and I have a few bikes I maintain. And the space in my garage is limited. A bike lift is over 7" tall when lowered. That's to tall to even park a bike on it etc etc.

The 1970 10x6x1/2 steel I beam is plenty over engineered . I had a Cal King water bed above it years ago with no problems.

The additional I beam lag bolted to the 2x10's is another situation. But Im positive 4 adults equaling more than 600 lbs standing directly above the hang spot wouldn't be a issue. Unless both situations.. Bike hung with 4 teenages jumping above, occur at the same time. Wont ever happen..

If I locate centerlines of the 2x10's accurately by poking around with a small drill bit. I know a 6x4x1/2" I beam lag bolted to lets say.. Seven 2x10's, extending all the way and anchored to the concrete foundation would hold 400 lbs easy. The I beam might weigh more.

Last edited by rebar; 08-18-2010 at 09:51 PM.
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Old 08-19-2010, 01:52 PM   #6
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So is hanging the bike from the roof for storage purposes or to work on the bikes at a more acceptable level? If it is the latter, it would be cheaper and safer to get yourself a higher motorcycle lift.
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Last edited by drtbk4ever; 08-19-2010 at 01:56 PM.
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