Not really no. I think I'll just stick with the prefab stands. The Youtube video was like every other video on building a stand and focused more on dimensions and aesthetics rather than on how much weight it would hold and why.
I really just put the video in there so you could reference how to build a simple box from framing lumber, not so much an explanation as to its load bearing capacity.
But Like I mentioned above, it’s load bearing capacity is unmatched by the metal stand. It’s not even gonna be close. I have shelves I’ve built similarly to the video and they are rock solid, holding literal tons of weight in my garage. I got rid of those metal style units that you linked because I could shake them with one hand, to the point where I’m sure I could have caused them to fail with little effort.
If you’re searching for a “why” in terms of how much weight something can hold.... the weight bearing of the metal shelf is just a number printed on the box isn’t it? I’d guess that those numbers are determined by testing the shelf in the best possible scenario, with a carefully placed, evenly balanced and completely static load, and no forces applied while the shelf was loaded up.
If it means anything, from what I can remember.... a 2x4 wall can support like 20,000-30,000 lbs. Your average 2x4 has a vertical load bearing capacity of 1000lbs. Your average 4x4 is something like 5000lbs. And I think those numbers are for full 8ft pieces, so for shorter pieces those numbers will be higher. That diy video I linked Uses 2x4 legs... each leg is 2 vertical 2x4s.... for a total of 8 vertical 2x4s. Now.... this is far from how you determine the load bearing capacity of a structure, however as you can see, you’ve got like 8000lbs of capacity just from those kinds of legs. You also have to take into consideration how the legs are attached to each other, but with proper methods, you’re not really opening yourself up to any big time weak points that will take that number down dangerously low.
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