hoist mounting options

[Bigmac0603]

I am planning to mount a hoist to the ceiling of my garage. First, it is capable of supporting the weight. 2x12's on 12" centers across the whole ceiling. It is the also the floor to my second story (unfinished) man cave. It was designed for 40lbs/sq inch load bearing. I am thinking about a beam and trolley setup but I am not sure how to mount the beam to the ceiling. Any suggestions?

Chris

 

[Lkdelta]

I have 2 "ten-foot high floor jacks" standing on the concrete garage floor holding up a 2"X6"X12' span I nailed and glued together and centered between the "upstairs floor joists".
Add a short piece of 2X4 at the end of the beam so the floor jacks don't squeeze the beam tight to the upstairs floor in the miiddle of the beam. You'll need to get chain, rope what-ever around the beam as a lifting anchor unless you do find the trolley

There is no weight load added on the upstairs floor, just some short 2X4 to keep the lift straight, square and not moving when there is a load on the beam I built

 

[PAToyota]

I'm guessing that you meant 40lbs/sq ft? Per square inch and you'd be talking industrial steel framing! I designed things for my second floor wood shop with 100lbs/sq ft for the floor. 40lbs/sq inch would be nearly three tons per square foot...

I'd recommend columns supporting the beam rather than hanging a steel beam from wood joists.

Despite the ability of the joists to hold the weight "on paper," the attachment becomes critical or you could end up with only a few joists actually supporting the weight rather than the weight being uniformly distributed across many joists. A trolley or lifting from different points at different times would also cause different loading on different joists.

And, over time, this could change as the joists sag and move due to loading on the second floor or even just as the joists age.

 

[Bigmac0603]

I'm guessing that you meant 40lbs/sq ft? Per square inch and you'd be talking industrial steel framing! I designed things for my second floor wood shop with 100lbs/sq ft for the floor. 40lbs/sq inch would be nearly three tons per square foot...

I am repeating what my builder told me. I am not an engineer so I don't really know. Just for comparision reasons what what did you do to get to 100lbs/ sq ft? ie.. what size joist, on center spacing, and span.

I'd recommend columns supporting the beam rather than hanging a steel beam from wood joists.

Despite the ability of the joists to hold the weight "on paper," the attachment becomes critical or you could end up with only a few joists actually supporting the weight rather than the weight being uniformly distributed across many joists. A trolley or lifting from different points at different times would also cause different loading on different joists.

And, over time, this could change as the joists sag and move due to loading on the second floor or even just as the joists age.

I know this is the best method and will probably try and figure something out along this line just not sure how since I want the beam to run down the center of the garage and not across.

Chris

 

[edl]

maybe a combination?

so i have a steel i beam as the header of the garage door (builder did it...so it is just there) - maybe you do that on one end and a floor mounted support on the other

the only problem there is the height would be 9' - in my case that would cut off 3' of vertical space to the 12' ceiling...

 

[PAToyota]

I am repeating what my builder told me. I am not an engineer so I don't really know. Just for comparision reasons what what did you do to get to 100lbs/ sq ft? ie.. what size joist, on center spacing, and span.

My floor is 2x12 on 16" o.c. with 12' spans and a 3/4" subfloor glued and screwed to create a diaphragm all sitting on W14x26 beams - which is what my gantry runs on.

There is no way to get 40lbs/sq in bearing out of 2x wood framing.

 

[LEVE]

There's a difference in how floor joists react to loads placed on top of them, and how they react to loads screwed into the bottom of them.

I'd be tempted to take an I-beam and span the expanse of the garage, resting the beam on two 4X4 columns in each wall. Then, I'd fab a third 4X4 post I could slide back and forth anywhere along the length of the I-beam. Then, you'll have a stable load-bearing capable I-beam from which to hang a load.

 

[PAToyota]

just not sure how since I want the beam to run down the center of the garage and not across.

Are you saying inline? Like from the garage door in?

The other questions are how far you are spanning and what sorts of loads you are talking about being able to lift.

I have three beams running parallel to the direction that the cars pull in. From these is a third beam that runs on trolleys on those three beams. On that is a trolley with the hoist. So I can run back and forth nearly in any direction.

 

[Bigmac0603]

Are you saying inline? Like from the garage door in?

Yes

The other questions are how far you are spanning and what sorts of loads you are talking about being able to lift.

20' span. small block v8 Engine/trans combo would be the most I would possibly lift.

I have three beams running parallel to the direction that the cars pull in. From these is a third beam that runs on trolleys on those three beams. On that is a trolley with the hoist. So I can run back and forth nearly in any direction.

This sounds good. Do you have any pictures of this setup.


So mine is obviously not the 40lbs/in I was told but it should be somewhere close to yours with 2 x 12 joist, 12" o.c., and 20 foot spans. I have a wider span but closer spacing on the joist. I also have a glued and screwed 3/4" floor for the second story. I know the closer spacing was the higher load bearing option that I choose.

 

[PAToyota]

So mine is obviously not the 40lbs/in I was told but it should be somewhere close to yours with 2 x 12 joist, 12" o.c., and 20 foot spans.

Actually, psf starts dropping off as you go above 12' spans. If you look here, you see that 12"oc and 18' to 21' spans you're only getting 40psf dead load and 10psf live load.

I'll get some pictures up today.

 

[PAToyota]

Easiest way to show it is from the design drawings.

 

[hobie1dog]

 

[PAToyota]

For lighter loads that is an excellent option. I'm guessing that the brackets are each fastened into a ceiling joist?

I have seen people "open up" those barn door tracks trying to hoist heavier loads. The track just spreads and deforms until the trolley falls out of it.