L-shaped desk without support legs?

[zarkov]

I would like to build an L-shaped desk in my home office in connection with renovating it this spring. The surface is 200x180x60 cm according to the picture and I am considering if and how it can be done without having any (visible) support leg at the joint. The idea was to attach a frame of horizontal beams to the wall and a diagonal under the joint but the question is if that's enough? It won't be used as a workbench for heavy machines, just a computer and paper.

What dimensions does the diagonal need to have if built from wood (solid/glue-laminated) or square tube? In the worst case, I can imagine a support leg between the diagonal and the floor corner.

 

[Testarn]

Will the panels be supported everywhere there is a dashed line?

If so, I would say it's enough to fasten the panels together with dowels/special fittings/screwed plate to support the inner corner. (Assuming it's a small load like a laptop/keyboard on the edge)

If you want to be completely sure, a 30mm square tube screwed into the ends and into the panel would be very strong.

 

[zarkov]

Will the boards have support everywhere there is a dashed line?

If so, I would say it's enough to fasten the boards together with plugs/special fittings/screwed plate to support the inner corner. (Provided that it's a small load like a laptop/keyboard on the outermost part)

If you want to be completely sure, a square tube of 30mm screwed at the ends and in the board would be very strong.

Thanks, yes the idea is to attach battens along all the outer edges where it is dashed. Right now, I'm leaning towards taking a 30x30 or 40x40 square tube from Biltema on the diagonal. If I've calculated correctly, I get a deflection of 5mm if I sit on a 40mm tube, without a board, and I think that is definitely acceptable.

 

[z_bumbi]

What kind of countertop would you like?

 

[zarkov]

What kind of countertop do you want?

Preferably a wooden board, maybe a glued oak board? 20-25mm thick.

 

[z_bumbi]

If you go up in dimension, the need for support decreases, though it quickly becomes ridiculously expensive.

My idea is that you attach a strip to the front edge that hides most of two steel brackets. What is visible is the diagonal brace against the wall, and only when you are under the countertop. A bracket of a suitable type is about 2.5 to 4 mm thick, so if desired, you can also recess it into the board or choose one that ends a bit from the front edge so it's not visible.
However, a rule/a pipe at an angle probably works at least as well.

 

[zarkov]

Yes, and it's not entirely easy to find thicker boards either, without custom ordering. Ikea charges around 1800 kr/m for their boards and other suppliers aren't cheaper. 2-meter long laminated boards of 20-25mm can be found here and there in the DIY stores for around 1500-2000 kr.

 

[oddan]

I did something similar a couple of years ago. Mounted 40x40 aluminum profiles on the walls and then had an oak-veneered 44 mm MDF board as a desk. Turned out very well!