Has anyone tried one of these upside down?
http://ecx.images-amazon.com/images/I/31pnNt4YG3L.jpg
Since the scenery goes up the side of a mountain toward the backdrop, the brace would be hidden if it were mounted on the top.
I used those along two walls, but I put them under. When they are under, all the screws are just securing the bracket, all the weight is being born by the bracket. If you put them on the top, the screws will be supporting the load, both at the platform and against the wall.
I would think that the forces trying to pull the screws out of the wall would be about the same in either case since the bracket becomes a lever when weight is applied on the point away from the wall.
For the shelf, I should have been more specific. I would sit the wall and isle side of the grid on new top of the bracket.
What I was concerned about was the angled support of the bracket and whether it would pull out of it’s slot. The samples of those that I’ve examined at Home Depot look like they are designed only to resist compression.
Carl,
I’m no engineer but I think you are right about the forces on the screws in the wall. But the forces against the screws holding the shelf would undoubtedly be greater than if used as intended.
I don’t understand your second paragraph.
Are the brackets made of steel? If so, how about having someone weld the angle support to the 90 degree bracket?
Good luck!
I have this type as well using them as bottom mounted (as intended) and screwed into a wall stud. They are very strong when used this way - especially when combined with L-girders for the lower deck. While our typical benchwork weight is well under the stress limits of these brackets, I would think that if top mounted that flexing during construction would be less than ideal and may lead to failures. It would be worthwhile to look at the Kamlbach book on multi-deck design for thoughts on options.
Charles
Like this:
Ahhh…got it!