Garage ceiling I-beam, how much weight can I hoist on it?

Hi there I have a double garage with a 20' I-beam above, and I want to know how much I might be able to safely hang on it using a hoist and trolley. Its 10' high, and holds up a bedroom upstairs.
I-beam size = 20' long, 12" tall, 6.5" wide, 1/2" thick at flange. It's welded to a 4" steel pole embedded in concrete on one end, and rests on a basement wall on the other side.
What do you think I should be able to lift? House feels pretty solid.
Thanks
Dean
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You need to have someone do a load calculation, even though it appears to be strong enough, it might not hold up to what you want to hoist. I had a similar issue when I added a storage space above my garage. Ron

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Depends on what it is already holding up above.
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dean wrote:

Well few builders will put a beam in larger than necessary to carry the weight of the structure. You need to know what it is already supporting.
--
Joseph Meehan

Dia duit
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Once you determine that, I'd still put in a vertical support under the beam while I was doing the lifting.
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Edwin Pawlowski wrote:

And I would make the vertical support have a very large base in order to NOT crack my concrete floor with a point load.
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Robert Allison
Rimshot, Inc.
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Robert Allison wrote:

Good point. :)
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Say you use a 4x4 as the support. Isn't there a max base size that's going to do any good? If it was 3/4 plywood, at some size of the plywood and load, woulnd't the ply "buckle" upwards and reduce the area that is transfering the load to the concrete?
--
charles

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Charles Bishop wrote:

Of course! But you don't have to use plywood, in fact, I wouldn't use plywood. I would use a steel base with reinforcing gussets to transfer the load to as large an area as possible and place that on a sheet of plywood.
Of course, it is also possible that the I beam in question is large enough to support whatever he is going to lift without any help at all. Impossible to determine from here. But if it isn't, and you use a support, then you had better spread the load, hope there is a footing under that point, install a footing under that point, or just hope for thick concrete and no cracks.
--
Robert Allison
Rimshot, Inc.
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I think they did in this case: a 12" I-beam can carry an awful lot of weight... but I agree with the recommendation to have an engineer do a load calc, especially if the OP is planning to use this I-beam for hoisting auto engines.
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Regards,
Doug Miller (alphageek at milmac dot com)
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You can stretch a string under the beam and see how much sag you have already. If there is very little sag, then you can use the string to keep track as you lift your weight.
Or you can spend a couple of thousand and hire an engineer. Your choice.
Jiml
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i had a 12" 25ft i beam 1/2" thick in a garage and we pulled engines out of cars and lifted the front of some big lawn tractors and it never budged.i did do most of the lifting within 10 feet of the wall if that matters. i dont think any of the engines were over 1000 pounds..when you lift .you can see it if it sags ,just put some kind of homemade guage on it . lucas
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Do a test by hoisting your mother-in-law up there. Come back in a week and see if she's still yakking.
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Ok so could someone tell me what the center deflection would be with, for example, a 1000 lb center weight applied to this beam? I used to have a beam calculator, not sure where it is now.
Thanks
Dean
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