Understanding how to prevent wood structural sag sag in future projects
I recently completed a project for a client that involved making a 9'L x 15"D x 12"H TV base. It's a 5 sides box (made with 45" mitre cuts, and a slide in back panel), and it has 2 internal walls evenly spaced creating 3 inside spaces of roughly 3'L x 13.5"D x 10.5"H. There are three doors hinged at the bottom that fold down via touch latches. That is to say the doors offer pretty much no structural support.
It was all made with 3/4" birch ply.
Now, all is well except in the middle of the doors the ply sags about 1/8". It's not a big deal since this is mostly hidden by the doors, but I was wondering what options would exist to prevent this sag. The obvious come to mind which are:
- More internal supports
- Thicker/stronger top material
- Smaller internal spaces
but I was wondering if there are any tricks that I'm missing?