If just the brackets, and not the shelf itself, are secured to the wall, both connections to the wall will see the same bending moment. The shelf with the 45 degree brackets will deflect less, since it is more compressive than pure bending.Wasn't sure of anywhere to ask this quick question.. which shelf bracket would be more secure to hold a shelf and microwave, figure 45-50 lb? Shelf would also need to be an inch or two off the wall to allow the back of microwave to have space. The main issue is, only one of the sides has a stud available, other would be into drywall
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For the drywall only side, i could use 4 drywall screws, or should I do toggle bolts (whether all 4 or just 2 and other 2 are drywall screws)?
Much appreciated!
My instinct is that the 45* angle one will hold the weight better, I recall something from some form of science or math class where that would make sense haha
If you can put a couple of small L shaped brackets perhaps on top of the shelf to keep the shelf from pulling away from the wall, then the 45 degree bracket will be superior, and much stiffer. Then the brackets on top of the shelf are taking all of the rotation out in tension, and the 45s are closer to pure shear down the wall.
That's my back of the napkin (text box on THP) structural analysis.
There are pretty strong toggle bolts available for drywall. We used a bunch to hang our cabinets above the window in our laundry room.