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Joined: Jan 2005
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10 point
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10 point
Joined: Jan 2005
Posts: 2,580 |
Hanging harbor freight electric hoist in the garage ceiling to lift the convertible hardtop using a unistrut trolley. The ceiling joists are 2x14 i-joists so I'm going to have to hang blocking between them to support.
The whole rig (hoist with hardtop) will be about 100 pounds. I'm pretty sure 2x lumber will support the weight with 2 attachment points, but does 2x give enough meat to drive lag bolts into? Should I consider 4x to make sure there's enough material for a lag bolt to grab into? I have also seen a guy use 4x4 and drill all the way through it to bolt through with a washer or plate on top, which may be overkill for my load.
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Joined: Sep 2004
Posts: 37,396 Likes: 66
Freak of Nature
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Freak of Nature
Joined: Sep 2004
Posts: 37,396 Likes: 66 |
not sure for your application. I used three I-beams 10-11 inch...2 uprights and 1 across. Trolly hanging off the one horizontal beam. I use it to lift 1000lb bag of deer feed out of my truck bed. Uprights bolted to concrete floor. Works like a charm, I can unload truck in 10 minutes by myself. Harbor Freight 2 ton hoist and HF trollies.
how much are you lifting????
Last edited by BhamFred; 03/16/24 06:08 PM.
I've spent most of the money I've made in my lifetime on hunting and fishing. The rest I just wasted.....
proud Cracker-Americaan
muslims are like coyotes, only good one is a dead one
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Joined: Jan 2005
Posts: 2,580
10 point
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10 point
Joined: Jan 2005
Posts: 2,580 |
how much are you lifting????
The hardtop is about 75 pounds, the hoist itself is maybe 25 so I'll have 100 pounds total supported from 2 attachment points. Key is I need to mount it to the ceiling to lift a removable hardtop off of the convertible .
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Joined: Dec 2013
Posts: 28,325 Likes: 565
a.k.a. Dingle Johnson
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a.k.a. Dingle Johnson
Joined: Dec 2013
Posts: 28,325 Likes: 565 |
Hanging harbor freight electric hoist in the garage ceiling to lift the convertible hardtop using a unistrut trolley. The ceiling joists are 2x14 i-joists so I'm going to have to hang blocking between them to support.
The whole rig (hoist with hardtop) will be about 100 pounds. I'm pretty sure 2x lumber will support the weight with 2 attachment points, but does 2x give enough meat to drive lag bolts into? Should I consider 4x to make sure there's enough material for a lag bolt to grab into? I have also seen a guy use 4x4 and drill all the way through it to bolt through with a washer or plate on top, which may be overkill for my load. Tension capacity of lag bolts is as follows: 1/4 inch lag bolt - up to 100 pounds per inch of thread. 5/16 inch lag bolt - up to 200 pounds per inch of thread. 3/8 inch lag bolt - up to 272 pounds per inch of thread. However I would double check the weight of everything: Hardtop, Rigging, winch, attachment material, everything and then design the bolted connections for at least 150% of what you calculate. Personally I would have at least 4 attachment points to the joists and make a "H" shaped mount out of 2x4's with all 4 ends of the "H" lag bolted to the joists. Can you simply bolt through the flanges of the joists? How much Flange width do the joists have? Anecdotal engineering... I've personally seen porch swings mounted to ceiling joists with 1/4" lag screw eye bolts and those things routinely hold 2 adults, plus the dynamic loading of the swing going back and forth. Two mother in laws on that thing and you'd be going over 600 pounds. 
Last edited by Irishguy; 03/16/24 06:29 PM.
"When I say ever thing I mean ever thing." - Frankie
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Joined: Jan 2017
Posts: 5,760 Likes: 75
12 point
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12 point
Joined: Jan 2017
Posts: 5,760 Likes: 75 |
If you can access the ceiling from the attic I would put a 4x4 across the tops of the the joists and and put a rod up though the ceiling and through the 4x4 and use washer and nut to secure. I have done this with a porch swing and it is rock solid.
"It is the mark of an educated mind to be able to entertain a thought without accepting it"
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Joined: Sep 2012
Posts: 24,103 Likes: 296
Freak of Nature
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Freak of Nature
Joined: Sep 2012
Posts: 24,103 Likes: 296 |
If you can access the ceiling from the attic I would put a 4x4 across the tops of the the joists and and put a rod up though the ceiling and through the 4x4 and use washer and nut to secure. I have done this with a porch swing and it is rock solid. This ^^^^ is the way to do it.
Dying ain't much of a living boy...Josey Wales
Molon Labe
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Joined: Jan 2005
Posts: 2,580
10 point
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10 point
Joined: Jan 2005
Posts: 2,580 |
Hanging harbor freight electric hoist in the garage ceiling to lift the convertible hardtop using a unistrut trolley. The ceiling joists are 2x14 i-joists so I'm going to have to hang blocking between them to support.
The whole rig (hoist with hardtop) will be about 100 pounds. I'm pretty sure 2x lumber will support the weight with 2 attachment points, but does 2x give enough meat to drive lag bolts into? Should I consider 4x to make sure there's enough material for a lag bolt to grab into? I have also seen a guy use 4x4 and drill all the way through it to bolt through with a washer or plate on top, which may be overkill for my load. Tension capacity of lag bolts is as follows: 1/4 inch lag bolt - up to 100 pounds per inch of thread. 5/16 inch lag bolt - up to 200 pounds per inch of thread. 3/8 inch lag bolt - up to 272 pounds per inch of thread. However I would double check the weight of everything: Hardtop, Rigging, winch, attachment material, everything and then design the bolted connections for at least 150% of what you calculate. Personally I would have at least 4 attachment points to the joists and make a "H" shaped mount out of 2x4's with all 4 ends of the "H" lag bolted to the joists. Can you simply bolt through the flanges of the joists? How much Flange width do the joists have? Anecdotal engineering... I've personally seen porch swings mounted to ceiling joists with 1/4" lag screw eye bolts and those things routinely hold 2 adults, plus the dynamic loading of the swing going back and forth. Two mother in laws on that thing and you'd be going over 600 pounds. The ceiling is 2x14 i-joists, the top and bottom flanges are 2x1 with I think 1/2" osb vertical web. I plan to reinforce both sides of the web with 3/4 osb or plywood and hang dimensional blocking between the joists with top-flange mounted joist hangers to lag my trolly track into. The only thing going on it is about a 25# electric winch that will lift the 75# hardtop off of my convertible to keep it elevated instead of taking up floor space in the garage.
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Joined: Jul 2011
Posts: 39,938 Likes: 130
Freak of Nature
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Freak of Nature
Joined: Jul 2011
Posts: 39,938 Likes: 130 |
If you can access the ceiling from the attic I would put a 4x4 across the tops of the the joists and and put a rod up though the ceiling and through the 4x4 and use washer and nut to secure. I have done this with a porch swing and it is rock solid. This ^^^^ is the way to do it. Yep. Simple and strong, 1/2" all-thread should do it. I'd double nut it too.
"Why do you ask"?
Too many people spend money they don't have , on things they don't need, to impress people they don't know.
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Joined: Nov 2015
Posts: 21,456
Freak of Nature
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Freak of Nature
Joined: Nov 2015
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I have two in my shop. One small one (400 lb) mounted in unistrut the whole length of the shop (40’ ft). I only lift stuff that is 100-150 pounds max these brackets are bolted to each truss. https://www.amazon.com/gp/aw/d/B0B9LZCLK2/ref=ox_sc_saved_image_2?smid=&psc=1. The trolley will hit the head of the bolts unless you use trex framing screws with wide heads. I Mostly move stuff from assembly tables to trailer. I have another winch mounted to the roof in the attic to lift things from the shop to the attic. This spans four trusses and quarter inch steel brackets welded. I have lifted 60 gallon air compressor, blast cabinet, christmas stuff, etc into attic. For lathes, presses, Bridgeport, etc I use my gantry crane. i own heavy crap 
Last edited by jmudler; 03/16/24 10:33 PM.
Isaiah 5:20 Woe to those who call evil good and good evil, who put darkness for light and light for darkness, who put bitter for sweet and sweet for bitter.
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Joined: Nov 2013
Posts: 3,446 Likes: 28
10 point
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10 point
Joined: Nov 2013
Posts: 3,446 Likes: 28 |
If you can access the ceiling from the attic I would put a 4x4 across the tops of the the joists and and put a rod up though the ceiling and through the 4x4 and use washer and nut to secure. I have done this with a porch swing and it is rock solid. This ^^^^ is the way to do it. Yep. Simple and strong, 1/2" all-thread should do it. I'd double nut it too. About as simple as it gets
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Joined: Dec 2004
Posts: 20,179 Likes: 81
Freak of Nature
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Freak of Nature
Joined: Dec 2004
Posts: 20,179 Likes: 81 |
I deal with a lot of material hoists at work and design the rigging to go with them, depending on the application. OSHA calls for a 2:1 safety factor when dealing with material hoists. I know OSHA isn’t involved here but it’s still a good guideline to go by. So…if your lifting 100 lbs max, make sure your rigging is rated for 200 lbs minimum
Last edited by ford150man; 03/17/24 09:51 AM.
If voting made any difference, they wouldn’t let us do it.-Mark Twain
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Joined: Jan 2005
Posts: 2,580
10 point
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10 point
Joined: Jan 2005
Posts: 2,580 |
I deal with a lot of material joists at work and design the rigging to go with them, depending on the application. OSHA calls for a 2:1 safety factor when dealing with material joists. I know OSHA isn’t involved here but it’s still a good guideline to go by. So…if your lifting 100 lbs max, make sure your rigging is rated for 200 lbs minimum It is. I think I've figured out that I'll use 3 2x6 blocking between the i-joists to give my trolley rail 3 attachment points with 5/16 lag bolts. Should be plenty for this application.
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Joined: Dec 2004
Posts: 20,179 Likes: 81
Freak of Nature
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Freak of Nature
Joined: Dec 2004
Posts: 20,179 Likes: 81 |
Edited my response to say “hoists” rather than “joists” that it autocorrected to.
If voting made any difference, they wouldn’t let us do it.-Mark Twain
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