I'm building a new desk in my study, and I'm looking for some advice/guidance on structural strength.
The desk will be an L shape, mounted wall to wall along one side of the room, and desk to leg along the other wall of the room. The image I've included shows the measurements. The dotted lines show bracing along the wall (40mm wood, mounted to the wall, screwed to the desktop from the bottom. Yellow lines are solid legs to the ground. (The 500mm space between the wall and the solid leg on the top section is going to be made into a cupboard - all our routers, DVR, etc sit there, so I can't move that much.
The join between the two legs of the desk I was going to do as a mortise, and not glue up the ends to allow for some wood movement without cracking.
The whole desk is going to be made from 40mm laminated rubberwood.
My concerns are: - The wood is bloody heavy. I'm worried about the inner point between the legs of the desk being too weak to hold the weight of it. What do you think? One option is to build a leg down there, but if I can avoid that I'd like to.
- The length of the wood - I'm worried about sag over time. It's a desk, so it'll have computers and books and stuff on it, but also me leaning on it for hours a day. I have thought (and would love some advice here please) to hide a piece of 90 deg. aluminium underneath (cut a slot in the wood, route out slightly to one side to recess), and glue/screw the aluminium in there. Figured that would make it pretty rigid?
Any other suggestions? Is there anything else I should be worrying about?