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Heavy weight on a stud wall...

Old 01-18-2020, 02:46 PM
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Default Heavy weight on a stud wall...

Mounting (2) 24"x24" heavy welded and braced steel c-channel brackets on a garage wall, spaced 9 feet apart that will need to hold max of about 800 to 1000 pounds of steel stock up to 20 feet in length. Using (3) 1/4x3" lag bolts per bracket, fastened dead center of 2x4 stud in wall brackets about 7 feet up on a 10 foot exterior wall.

Not worried about the strength of the brackets; they are very stout. Just worried somewhat about the pullout force of the lags or even the studs buckling or tearing out from the top plate. MFG says over 700 pounds shear per bolt so that aspect shouldn't be an issue.

One buddy says they will hold 2x that weight another one says, need another bracket to be safe. Since everything I do is overkill and 800lbs of steel raining down would ruin my day, I think I'm going with buddy #2's advice. I'm also thinking that distributing heavy weight over more studs than just two would be better? Any input from the peanut gallery in case I'm over or underthinking this.









Old 01-18-2020, 03:22 PM
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To me it looks like if the weight is kept close to the wall it shouldn't be an issue but the farther away from the wall you get the more support you need. I would try to secure the bracket to the ceiling to play it safe. Just a thought


Old 01-18-2020, 03:25 PM
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Because I'm paranoid, and you are worried (some) double the amount of screws. Get a 1/4" drill and add three more holes in those brackets (evenly spaced) and have a total of six screws per bracket.
Or even more, while your at it. Figure some teenager or kid will likely try to swing from the storage unit or some such prank, or some numbskull will put the kitchen sink up there.

More fasteners is what I'd do.
Old 01-18-2020, 03:27 PM
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Adding the support in the front to the ceiling and you couldn't get the metal you're storing in onto the shelf. I'm thinking more about having the rear support into the studs going all the way up to the ceiling if you want more support.
Old 01-18-2020, 03:33 PM
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This might help on the pull-out strength of a lag bolt:
Screw%20Pull-out.pdf
A 10 foot tall 2x4 wood stud is pretty 'spindly' It might make sense to buy 15 minutes of a structural engineer to see if it works. I'm an architect not an engineer so it's beyond my ability to calculate but on the face of it I would be concerned about the 10' 2x4 more than the fasteners.
Old 01-18-2020, 03:33 PM
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I would absolutely use 4 mounting brackets over 4 or more studs.

Heck, I would have one bracket per stud that is within that span. With the long list of things that could happen, one failure is way too many.

Your first photo shows a lag Screw and not what I consider a lag bolt. Why not 3/8" lag bolts with backing washers?

Last edited by round2it; 01-18-2020 at 03:44 PM.
Old 01-18-2020, 03:36 PM
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Extend the vertical piece thats screwed to the wall , to the cieling and add a couple more screws.
Old 01-18-2020, 03:37 PM
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I'm on the route of a metal strap to ceiling joist if your going to have serious weight.
Old 01-18-2020, 03:38 PM
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IMO That's scary. I'm not a structural engineer, but that's a lot of weight on some 2X4"s. Can you stack the steel up vertically in a corner? I'd lay it on the floor.
Old 01-18-2020, 03:39 PM
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Add atleast one more complete bracket in the center.
Old 01-18-2020, 03:42 PM
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Originally Posted by mfix View Post
Add atleast one more complete bracket in the center.
This too
Old 01-18-2020, 03:46 PM
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New lag screws can out-spec old lag bolts, and damage what they are mounted into less. I think for that weight you need four brackets. And keep stock as tight to the wall as possible. I don't hate the idea of bringing the brackets all the way to the concrete floor to alleviate the weight "pulling" on the wall.
Old 01-18-2020, 03:48 PM
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Second thought... what's on the other side of that wall? Two brackets could create a pretty strong fulcrum on those studs...
Old 01-18-2020, 04:04 PM
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Can you thru bolt it with a nut on the other end??
beef up corner supports
Old 01-18-2020, 04:07 PM
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Originally Posted by skibum View Post
Second thought... what's on the other side of that wall? Two brackets could create a pretty strong fulcrum on those studs...
couple thousand pounds of steel leaning against it.
Old 01-18-2020, 04:18 PM
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I'd want the load spread over more 2x4's. Home Depot sells Unistrut and it's cheap. Rest a 10ft Unistrut on top of your brackets and lag it to the wall at every stud. Use a Unistrut angle bracket to secure it to the top of your brackets.
Old 01-18-2020, 04:21 PM
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I would not put that much weight on a 2x4 stud wall.
Old 01-18-2020, 04:28 PM
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I weld up 1x2” 14g tube and make brackets out if it all over my shop with a 3/8” x 2” flatbar welded against the wall. Most only extend 12” and all are secured with a single 5/16” x 3 1/2” GRK lag screw. Same as the SPAX you posted just 5/16. Never had a failure yet and one pair of brackets are easily holding up 500lbs of steel.

-Get some 2x12 cut long enough to spam three studs( 40” or so)stack 2-3 pieces so the entire bracket rest against it with the bracket center on the middle stud. This way you are distributing the load over three studs. Upgrade to 5/16 x 3 1/ 2 lag screws.

- or add 2 more brackets and use 5/16 lags even if you need to slightl drill out the mounting holes.

Whats the thickness of the C channel? Doesn’t look that thicknin pic?
Old 01-18-2020, 04:33 PM
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A 1/4” lag bolt has a shear force in excess of 10,000 lbs.

The pulling force on the top bolts is the concern, as you have the leverage of the weight as it moves away from the wall.

Can you add a tab to the top of the bracket to add a second bolt?

What is on the inside of that wall?

Last edited by aubv; 01-18-2020 at 05:20 PM.
Old 01-18-2020, 05:00 PM
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Lags with lead shields are not dependable. They loosen over time as the lead deforms. I've had them pull out years later. There are probably a hundred other options. I like thruough-bolting the best. If you can't get to the other side of the wall, epoxy anchors are second best in block. Poured concrete holds all sorts of anchors well but concrete block quality really varies. Some of it is really crumbly. In the old days of console TV sets, I've hung hundreds and hundreds of TV's on block walls. Also server racks and lots of other stuff.


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