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