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.
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.
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?
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
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
Doug Miller (alphageek at milmac dot com)
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
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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